GEGL operation reference

Image processing operations are shared objects (plug-ins) loaded when GEGL initializes. This page is generated from information registered by the plug-ins themselves.

Categories

A plug-in can belong in multiple categories. Below is indexes broken down into the various available categories.

edge

edge-detect

porter-duff

effects

blend

distort

enhance

video

compositors

svgfilter

misc

render

input

blur

math

core

transform

color

programming

display

transparency

output

meta

tonemapping

	gegl:add
	Math operation add (c = c + value)
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	Double 0.00 -inf - +inf	value	global value used if aux doesn't contain data
	gegl:bilateral-filter
	An edge preserving blur filter that can be used for noise reduction. It is a gaussian blur where the contribution of neighbourhood pixels are weighted by the color difference from the center pixel.
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Double 4.00 0.00-1000.00	blur-radius	Radius of square pixel region, (width and height will be radius*2+1).
	Double 8.00 0.00-100.00	edge-preservation	Amount of edge preservation
	gegl:box-blur
	Performs an averaging of a square box of pixels
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Double 4.00 0.00-1000.00	radius	Radius of square pixel region, (width and height will be radius*2+1)
	gegl:brightness-contrast
	Changes the light level and contrast.
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Double 1.00 -5.00-5.00	contrast	Range scale factor
	Double 0.00 -3.00-3.00	brightness	Amount to increase brightness
	gegl:buffer-sink
	A GEGL buffer destination surface.
	Object	input	Input pad, for image buffer input.
	Pointer	buffer	The location where to store the output GeglBuffer
	Pointer	format	The babl format of the output GeglBuffer, NULL to use input buffer format
	gegl:buffer-source
	A source that uses an in-memory GeglBuffer, for use internally by GEGL.
	Object	output	Output pad for generated image buffer.
	Object	buffer	The GeglBuffer to load into the pipeline
	gegl:c2g
	Color to grayscale conversion, uses envelopes formed from spatial color differences to perform color-feature preserving grayscale spatial contrast enhancement
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	int 300 2-3000	radius	Neighborhood taken into account, this is the radius in pixels taken into account when deciding which colors map to which gray values
	int 4 1-1000	samples	Number of samples to do per iteration looking for the range of colors
	int 10 1-1000	iterations	Number of iterations, a higher number of iterations provides less noisy results at a computational cost
	gegl:checkerboard
	Checkerboard renderer
	Object	output	Output pad for generated image buffer.
	int 16 1- +inf	x	Horizontal width of cells pixels
	int 16 1- +inf	y	Vertical width of cells in pixels
	int 0 -inf - +inf	x-offset	Horizontal offset (from origin) for start of grid
	int 0 -inf - +inf	y-offset	Vertical offset (from origin) for start of grid
	Color rgb(0.0000, 0.0000, 0.0000)	color1	One of the cell colors (defaults to 'black')
	Color rgb(1.0000, 1.0000, 1.0000)	color2	The other cell color (defaults to 'white')
	gegl:clone
	Clone a buffer
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	String ID	ref	The reference ID used as input (for use in XML).
	gegl:color
	Generates a buffer entirely filled with the specified color, crop it to get smaller dimensions.
	Object	output	Output pad for generated image buffer.
	Color rgb(0.0000, 0.0000, 0.0000)	value	The color to render (defaults to 'black')
	gegl:color-temperature
	Allows changing the color temperature of an image.
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Double 6500.00 1000.00-12000.00	original-temperature	Estimated temperature of the light source in Kelvin the image was taken with.
	Double 6500.00 1000.00-12000.00	intended-temperature	Corrected estimation of the temperature of the light source in Kelvin.
	gegl:color-to-alpha
	Performs color-to-alpha on the image.
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Color rgb(0.0000, 0.0000, 0.0000)	color	The color to render (defaults to 'black')
	gegl:contrast-curve
	Adjusts the contrast of the image according to a curve.
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Int 0 0-65536	sampling-points	Number of curve sampling points. 0 for exact calculation.
	Curve	curve	The contrast curve.
	gegl:convert-format
	Convert the data to the specified format
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	String RGBA float.	format	Babl output format string
	gegl:crop
	Crop a buffer
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Double 0.00 -inf - +inf	x	X
	Double 0.00 -inf - +inf	y	Y
	Double 10.00 -inf - +inf	width	Width
	Double 10.00 -inf - +inf	height	Height
	gegl:difference-of-gaussians
	Does an edge detection based on the difference of two gaussian blurs.
	Double 1.00 0.00-1000.00	radius1	Radius
	Double 2.00 0.00-1000.00	radius2	Radius
	gegl:display
	Display the input buffer in a window.
	Object	input	Input pad, for image buffer input.
	String window_titl	window-title	Title to be given to output window
	gegl:divide
	Math operation divide (c = value==0.0f?0.0f:c/value)
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	Double 1.00 -inf - +inf	value	global value used if aux doesn't contain data
	gegl:dropshadow
	Creates a dropshadow effect on the input buffer
	Double 0.50 -2.00-2.00	opacity	Opacity
	Double 20.00 -inf - +inf	x	Horizontal shadow offset
	Double 20.00 -inf - +inf	y	Vertical shadow offset
	Double 10.00 0.00- +inf	radius	Blur radius
	gegl:edge-laplace
	High-resolution edge detection
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	gegl:edge-sobel
	Specialized direction-dependent edge detection
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Boolean True	horizontal	Horizontal
	Boolean True	vertical	Vertical
	Boolean True	keep-signal	Keep Signal
	gegl:exp-combine
	Combine multiple scene exposures into one high range buffer
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	String	exposures	Relative brightness of each exposure in EV
	Int 12 8-32	steps	Log2 of source's discretization steps
	Double 8.00 0.00-32.00	sigma	Weight distrubtion sigma controlling response contributions
	gegl:exr-save
	OpenEXR image saver
	Object	input	Input pad, for image buffer input.
	String	path	path of file to write to.
	Int 0 0-2048	tile	tile size to use.
	gegl:fattal02
	Adapt an image, which may have a high dynamic range, for presentation using a low dynamic range. This operator attenuates the magnitudes of local image gradients, producing luminance within the range 0.0-1.0
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Double 1.00 0.00-2.00	alpha	Gradient threshold for detail enhancement
	Double 0.90 0.10-2.00	beta	Strength of local detail enhancement
	Double 0.80 0.00-1.00	saturation	Global color saturation factor
	Double 0.00 0.00-1.00	noise	Gradient threshold for lowering detail enhancement
	gegl:ff-load
	FFmpeg video frame importer
	Object	output	Output pad for generated image buffer.
	FilePath /home/pippi	path	Path of file to load
	Int 0 0-1000000	frame	Frame number
	gegl:fill-path
	Renders a filled region
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Color rgba(0.0000, 0.0000, 0.0000, 0.6000)	color	Color of paint to use for filling.
	Double 1.00 -2.00-2.00	opacity	The fill opacity to use.
	String nonzero	fill-rule	how to determine what to fill (nonzero|evenodd
	String	transform	svg style description of transform.
	Path	d	A GeglVector representing the path of the stroke
	gegl:fractal-explorer
	Fractal Explorer
	Object	output	Output pad for generated image buffer.
	int 400 1-10000000	width	Width
	int 400 1-10000000	height	Height
	Int 0 0-8	fractaltype	Type of a fractal
	Double -2.00 -3.00-3.00	xmin	Left
	Double 2.00 -3.00-3.00	xmax	Right
	Double -2.00 -3.00-3.00	ymin	Top
	Double 2.00 -3.00-3.00	ymax	Bottom
	Int 50 1-1000	iter	Iterations
	Double -0.75 -2.50-2.50	cx	CX (only Julia)
	Double 0.20 -2.50-2.50	cy	CY (only Julia)
	Double 1.00 0.00-1.00	redstretch	Red stretching factor
	Double 1.00 0.00-1.00	greenstretch	Green stretching factor
	Double 1.00 0.00-1.00	bluestretch	Blue stretching factor
	Int 1 0-2	redmode	Red application mode (0:SIN; 1:COS; 2:NONE)
	Int 1 0-2	greenmode	Green application mode (0:SIN; 1:COS; 2:NONE)
	Int 0 0-2	bluemode	Blue application mode (0:SIN; 1:COS; 2:NONE)
	Boolean False	redinvert	Red inversion
	Boolean False	greeninvert	Green inversion
	Boolean False	blueinvert	Blue inversion
	Int 256 2-8192	ncolors	Number of colors
	Boolean False	useloglog	Use loglog smoothing
	gegl:gamma
	Math operation gamma (c = powf (c, value))
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	Double 1.00 -inf - +inf	value	global value used if aux doesn't contain data
	gegl:gaussian-blur
	Performs an averaging of neighboring pixels with the normal distribution as weighting
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Double 4.00 0.00-10000.00	std-dev-x	Standard deviation for the horizontal axis. (multiply by ~2 to get radius)
	Double 4.00 0.00-10000.00	std-dev-y	Standard deviation for the vertical axis. (multiply by ~2 to get radius.)
	String auto	filter	Optional parameter to override the automatic selection of blur filter. Choices are fir, iir, auto
	gegl:grey
	Turns the image greyscale
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	gegl:grid
	Grid renderer
	Object	output	Output pad for generated image buffer.
	int 32 1- +inf	x	Horizontal width of cells pixels
	int 32 1- +inf	y	Vertical width of cells in pixels
	int 0 -inf - +inf	x-offset	Horizontal offset (from origin) for start of grid
	int 0 -inf - +inf	y-offset	Vertical offset (from origin) for start of grid
	int 4 0- +inf	line-width	Width of grid lines in pixels
	int 4 0- +inf	line-height	Height of grid lines in pixels
	Color rgb(0.0000, 0.0000, 0.0000)	line-color	Color of the grid lines
	gegl:introspect
	GEGL graph visualizer.
	Object	output	Output pad for generated image buffer.
	Object	node	GeglNode to introspect
	gegl:invert
	Inverts the components (except alpha), the result is the corresponding "negative" image.
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	gegl:jpg-save
	JPEG image saver (passes the buffer through, saves as a side-effect)
	Object	input	Input pad, for image buffer input.
	String	path	Target path and filename, use '-' for stdout
	Int 90 1-100	quality	JPEG compression quality (between 1 and 100)
	Int 0 0-100	smoothing	Smoothing factor from 1 to 100; 0 disables smoothing
	Boolean True	optimize	Use optimized huffman tables
	Boolean True	progressive	Create progressive JPEG images
	Boolean False	grayscale	Create a grayscale (monochrome) image
	gegl:layer
	A layer in the traditional sense
	String gegl:over..	composite-op	Composite operation to use
	Double 1.00 0.00-1.00	opacity	Opacity
	Double 0.00 -inf - +inf	x	Horizontal position
	Double 0.00 -inf - +inf	y	Vertical position
	Double 1.00 -inf - +inf	scale	Scale 1:1 size
	FilePath	src	Source datafile (png, jpg, raw, svg, bmp, tif, ...)
	gegl:lens-distortion
	Copies image performing lens distortion correction.
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Double 0.00 -100.00-100.00	main	Main value of distortion
	Double 0.00 -100.00-100.00	zoom	Main value of distortion
	Double 0.00 -100.00-100.00	edge	Edge value of distortion
	Double 0.00 -100.00-100.00	brighten	Brighten the image
	Double 0.00 -100.00-100.00	x-shift	Shift horizontal
	Double 0.00 -100.00-100.00	y-shift	Shift vertical
	gegl:levels
	Remaps the intensity range of the image
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Double 0.00 -1.00-4.00	in-low	Input luminance level to become lowest output
	Double 1.00 -1.00-4.00	in-high	Input luminance level to become white.
	Double 0.00 -1.00-4.00	out-low	Lowest luminance level in output
	Double 1.00 -1.00-4.00	out-high	Highest luminance level in output
	gegl:load
	Multipurpose file loader, that uses other native handlers, and fallback conversion using image magick's convert.
	FilePath	path	Path of file to load.
	gegl:mantiuk06
	Adapt an image, which may have a high dynamic range, for presentation using a low dynamic range. This operator constrains contrasts across multiple spatial frequencies, producing luminance within the range 0.0-1.0
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Double 0.10 0.00-1.00	contrast	The amount of contrast compression
	Double 0.80 0.00-2.00	saturation	Global colour saturation factor
	Double 1.00 1.00-99.00	detail	Level of emphasis on image gradient details
	gegl:map-absolute
	sample input with an auxiliary buffer that contain absolute source coordinates
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	Enum	sampler-type	Sampler used internaly
	gegl:map-relative
	sample input with an auxiliary buffer that contain relative source coordinates
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	Double 1.00 0.00-5000.00	scaling	scaling factor of displacement, indicates how large spatial displacement a relative mapping value of 1.0 corresponds to.
	Enum	sampler-type	Sampler used internaly
	gegl:matting-global
	Given a sparse user supplied tri-map and an input image, create a foreground alpha matte. Set white as foreground, black as background for the tri-map. Everything else will be treated as unknown and filled in.
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	Int 10 1- +inf	iterations	Number of iterations
	gegl:matting-levin
	Given a sparse user supplied tri-map and an input image, create a foreground alpha mat. Set white as selected, black as unselected, for the tri-map.
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	Int -6 -9--1	epsilon	Log of the error weighting
	Int 1 1-3	radius	Radius of the processing window
	Double 0.02 0.00-0.10	threshold	Alpha threshold for multilevel processing
	Double 100.00 0.00-100.00	lambda	Trimap influence factor
	Int 4 0-8	levels	Number of downsampled levels to use
	Int 2 0-8	active-levels	Number of levels to perform solving
	gegl:mblur
	Accumulating motion blur
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Double 0.95 0.00-1.00	dampness	The value represents the contribution of the past to the new frame.
	gegl:mirrors
	Applies mirroring effect on the image.
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Double 0.00 0.00-180.00	m-angle	Rotation applied to the mirrors
	Double 0.00 0.00-360.00	r-angle	Rotation applied to the result
	Int 6 2-24	n-segs	Number of mirrors to use
	Double 0.50 0.00-1.00	c-x	X offset of the result of mirroring
	Double 0.50 0.00-1.00	c-y	Y offset of the result of mirroring
	Double 0.00 -1.00-1.00	o-x	X axis ratio for the center of mirroring
	Double 0.00 -1.00-1.00	o-y	Y axis ratio for the center of mirroring
	Double 0.00 0.00-0.50	trim-x	X axis ratio for trimming mirror expanse
	Double 0.00 0.00-0.50	trim-y	Y axis ratio for trimming mirror expanse
	Double 100.00 0.10-100.00	input-scale	Scale factor to make rendering size bigger
	Double 1.00 0.00-100.00	output-scale	Scale factor to make rendering size bigger
	Boolean True	clip	Clip result to input size
	Boolean True	warp	Fill full output area
	gegl:mono-mixer
	Monochrome channel mixer
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Double 0.50 -10.00-10.00	red	Amount of red
	Double 0.25 -10.00-10.00	green	Amount of green
	Double 0.25 -10.00-10.00	blue	Amount of blue
	gegl:motion-blur
	Linear motion blur
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Double 10.00 0.00-1000.00	length	Length of blur in pixels
	Double 0.00 -360.00-360.00	angle	Angle of blur in degrees
	gegl:multiply
	Math operation multiply (c = c * value)
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	Double 1.00 -inf - +inf	value	global value used if aux doesn't contain data
	gegl:noise-reduction
	Anisotropic like smoothing operation
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	int 4 0-32	iterations	How many iteratarions to run the algorithm with
	gegl:nop
	No operation (can be used as a routing point)
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	gegl:opacity
	Weights the opacity of the input both the value of the aux input and the global value property.
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	Double 1.00 -10.00-10.00	value	Global opacity value that is always used on top of the optional auxiliary input buffer.
	gegl:open-buffer
	A source that uses an on-disk GeglBuffer.
	Object	output	Output pad for generated image buffer.
	String	path	a GeglBuffer on disk to open
	gegl:path
	Renders a brush stroke
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Color rgba(0.0000, 0.0000, 0.0000, 0.6000)	fill	Color of paint to use for filling, use 0 opacity to disable filling
	Color rgba(0.0000, 0.0000, 0.0000, 0.0000)	stroke	Color of paint to use for stroking
	Double 2.00 0.00-200.00	stroke-width	The width of the brush used to stroke the path
	Double 1.00 -2.00-2.00	stroke-opacity	Opacity of stroke, note, does not behave like SVG since at the moment stroking is done using an airbrush tool
	Double 0.60 0.00-1.00	stroke-hardness	Hardness of the brush, 0.0 for a soft brush, 1.0 for a hard brush
	String nonzero	fill-rule	How to determine what to fill (nonzero|evenodd
	String	transform	SVG style description of transform
	Double 1.00 -2.00-2.00	fill-opacity	The fill opacity to use
	Path	d	A GeglVector representing the path of the stroke
	gegl:perlin-noise
	Perlin noise generator
	Object	output	Output pad for generated image buffer.
	Double 1.20 -inf - +inf	alpha	not documented
	Double 1.80 -inf - +inf	scale	not documented
	Double -1.00 -inf - +inf	zoff	not documented
	Double 0.00 -inf - +inf	seed	not documented
	Int 3 0-20	n	not documented
	gegl:pixbuf
	Uses the GdkPixbuf located at the memory location in pixbuf.
	Object	output	Output pad for generated image buffer.
	Pointer	pixbuf	GdkPixbuf to use
	gegl:pixelize
	Simplify image into an array of solid-colored squares
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	int 16 1-123456	size-x	Width of blocks in pixels
	int 16 1-123456	size-y	Height of blocks in pixels
	gegl:png-save
	PNG image saver (passes the buffer through, saves as a side-effect.)
	Object	input	Input pad, for image buffer input.
	String	path	Target path and filename, use '-' for stdout.
	Int 1 1-9	compression	PNG compression level from 1 to 9
	Int 16 8-16	bitdepth	8 and 16 are amongst the currently accepted values.
	gegl:polar-coordinates
	Performs polar-coordinates on the image.
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Double 100.00 0.00-100.00	depth	Circle depth in percent
	Double 0.00 0.00-359.90	angle	Offset angle.
	Boolean False	bw	Start from the right instead of the left
	Boolean True	top	Put the top row in the middle and the bottom row on the outside
	Boolean True	polar	Map the image to a circle
	Int 0 0- +inf	pole-x	Origin point for the polar coordinates
	Int 0 0- +inf	pole-y	Origin point for the polar coordinates
	Boolean True	middle	Let origin point to be the middle one
	gegl:posterize
	Reduces the number of levels in each color component of the image.
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	int 8 1-64	levels	number of levels per component
	gegl:ppm-save
	PPM image saver (Portable pixmap saver.)
	Object	input	Input pad, for image buffer input.
	String	path	Target path and filename, use '-' for stdout.
	Boolean True	rawformat	Raw format
	Int 16 8-16	bitdepth	8 and 16 are amongst the currently accepted values.
	gegl:rectangle
	A rectangular source of a fixed size with a solid color
	Double 0.00 -inf - +inf	x	Horizontal position
	Double 0.00 -inf - +inf	y	Vertical position
	Double 0.00 0.00- +inf	width	Horizontal extent
	Double 0.00 0.00- +inf	height	Vertical extent
	Color rgb(1.0000, 1.0000, 1.0000)	color	Color to render
	gegl:reflect
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Double 0.00 -inf - +inf	origin-x	X coordinate of origin
	Double 0.00 -inf - +inf	origin-y	Y coordinate of origin
	String linear	filter	Filter type (nearest, linear, lanczos, cubic, lohalo)
	Boolean False	hard-edges	Hard edges
	Int 3 3-6	lanczos-width	Width of the Lanczos function
	Double 0.00 -inf - +inf	x	Direction vector's X component
	Double 0.00 -inf - +inf	y	Direction vector's Y component
	gegl:reinhard05
	Adapt an image, which may have a high dynamic range, for presentation using a low dynamic range. This is an efficient global operator derived from simple physiological observations, producing luminance within the range 0.0-1.0
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Double 0.00 -100.00-100.00	brightness	Overall brightness of the image
	Double 0.00 0.00-1.00	chromatic	Adapation to colour variation across the image
	Double 1.00 0.00-1.00	light	Adapation to light variation across the image
	gegl:remap
	stretch components of pixels individually based on luminance envelopes
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	Object	aux2	Second auxiliary image buffer input pad.
	gegl:rgbe-save
	RGBE image saver (Radiance HDR format)
	Object	input	Input pad, for image buffer input.
	String	path	Target path and filename, use '-' for stdout.
	gegl:ripple
	Transform the buffer with a ripple pattern
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Double 25.00 0.00-1000.00	amplitude	Amplitude of the ripple
	Double 200.00 0.00-1000.00	period	Period of the ripple
	Double 0.00 -1.00-1.00	phi	Phase shift
	Double 0.00 -180.00-180.00	angle	Angle in degree
	Enum	sampler-type	Sampler used internally
	Enum	wave-type	Type of wave
	gegl:rotate
	Rotate the buffer around the specified origin.
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Double 0.00 -inf - +inf	origin-x	X coordinate of origin
	Double 0.00 -inf - +inf	origin-y	Y coordinate of origin
	String linear	filter	Filter type (nearest, linear, lanczos, cubic, lohalo)
	Boolean False	hard-edges	Hard edges
	Int 3 3-6	lanczos-width	Width of the Lanczos function
	Double 0.00 -inf - +inf	degrees	Angle to rotate (clockwise)
	gegl:save
	Multipurpose file saver, that uses other native handlers.
	Object	input	Input pad, for image buffer input.
	FilePath	path	Path of file to save.
	gegl:save-pixbuf
	Save output into a GdkPixbuf.
	Object	input	Input pad, for image buffer input.
	Pointer	pixbuf	The location where to store the output GdkPixbuf.
	gegl:scale
	Scales the buffer.
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Double 0.00 -inf - +inf	origin-x	X coordinate of origin
	Double 0.00 -inf - +inf	origin-y	Y coordinate of origin
	String linear	filter	Filter type (nearest, linear, lanczos, cubic, lohalo)
	Boolean False	hard-edges	Hard edges
	Int 3 3-6	lanczos-width	Width of the Lanczos function
	Double 1.00 -inf - +inf	x	Horizontal scale factor
	Double 1.00 -inf - +inf	y	Vertical scale factor
	gegl:sdl-display
	Displays the input buffer in an SDL window (restricted to one display op/process, due to SDL implementation issues).
	Object	input	Input pad, for image buffer input.
	String window_titl	window-title	Title to be given to output window
	String icon_title.	icon-title	Icon to be used for output window
	Pointer	screen	private
	Int 0 0-1000	w	private
	Int 0 0-1000	h	private
	Int 0 0-1000	width	private
	Int 0 0-1000	height	private
	gegl:shear
	Shears the buffer
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Double 0.00 -inf - +inf	origin-x	X coordinate of origin
	Double 0.00 -inf - +inf	origin-y	Y coordinate of origin
	String linear	filter	Filter type (nearest, linear, lanczos, cubic, lohalo)
	Boolean False	hard-edges	Hard edges
	Int 3 3-6	lanczos-width	Width of the Lanczos function
	Double 1.00 -inf - +inf	x	Horizontal shear amount
	Double 1.00 -inf - +inf	y	Vertical shear amount
	gegl:snn-mean
	Noise reducing edge enhancing blur filter based on Symmetric Nearest Neighbours
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	int 8 0-100	radius	Radius of square pixel region, (width and height will be radius*2+1)
	Int 2 1-2	pairs	Number of pairs; higher number preserves more acute features
	gegl:soft-light
	SVG blend operation soft-light (if 2 * cA < aA: d = cB * (aA - (aB == 0 ? 1 : 1 - cB / aB) * (2 * cA - aA)) + cA * (1 - aB) + cB * (1 - aA); if 8 * cB <= aB: d = cB * (aA - (aB == 0 ? 1 : 1 - cB / aB) * (2 * cA - aA) * (aB == 0 ? 3 : 3 - 8 * cB / aB)) + cA * (1 - aB) + cB * (1 - aA); otherwise: d = (aA * cB + (aB == 0 ? 0 : sqrt (cB / aB) * aB - cB) * (2 * cA - aA)) + cA * (1 - aB) + cB * (1 - aA))
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	gegl:stress
	Spatio Temporal Retinex-like Envelope with Stochastic Sampling
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	int 300 2-5000	radius	Neighborhood taken into account, for enhancement ideal values are close to the longest side of the image, increasing this increases the runtime
	int 5 2-200	samples	Number of samples to do per iteration looking for the range of colors
	int 5 1-200	iterations	Number of iterations, a higher number of iterations provides a less noisy rendering at a computational cost
	gegl:stretch-contrast
	Scales the components of the buffer to be in the 0.0-1.0 range. This improves images that make poor use of the available contrast (little contrast, very dark, or very bright images).
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	gegl:subtract
	Math operation subtract (c = c - value)
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	Double 0.00 -inf - +inf	value	global value used if aux doesn't contain data
	gegl:svg-huerotate
	SVG color matrix operation svg_huerotate
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	String	values	list of s
	gegl:svg-load
	Load an SVG file using librsvg
	Object	output	Output pad for generated image buffer.
	FilePath	path	Path to SVG file to load
	Int 100 1- +inf	width	Width for rendered image
	Int 100 1- +inf	height	Height for rendered image
	gegl:svg-luminancetoalpha
	SVG color matrix operation svg_luminancetoalpha
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	String	values	list of s
	gegl:svg-matrix
	SVG color matrix operation svg_matrix
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	String	values	list of s
	gegl:svg-multiply
	SVG blend operation svg-multiply (d = cA * cB + cA * (1 - aB) + cB * (1 - aA))
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	gegl:svg-saturate
	SVG color matrix operation svg_saturate
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	String	values	list of s
	gegl:text
	Display a string of text using pango and cairo.
	Object	output	Output pad for generated image buffer.
	Multiline Hello	string	String to display (utf8)
	String Sans	font	Font family (utf8)
	Double 10.00 1.00-2048.00	size	Approximate height of text in pixels.
	Color rgb(0.0000, 0.0000, 0.0000)	color	Color for the text (defaults to 'white')
	Int -1 -1-1000000	wrap	Sets the width in pixels at which long lines will wrap. Use -1 for no wrapping.
	Int 0 0-2	alignment	Alignment for multi-line text (0=Left, 1=Center, 2=Right)
	Int 0 0-1000000	width	Rendered width in pixels. (read only)
	Int 0 0-1000000	height	Rendered height in pixels. (read only)
	gegl:threshold
	Thresholds the image to white/black based on either the global value set in the value property, or per pixel from the aux input.
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	Double 0.50 -10.00-10.00	value	Global threshold level (used when there is no auxiliary input buffer).
	gegl:transform
	Transforms the group (used by svg).
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Double 0.00 -inf - +inf	origin-x	X coordinate of origin
	Double 0.00 -inf - +inf	origin-y	Y coordinate of origin
	String linear	filter	Filter type (nearest, linear, lanczos, cubic, lohalo)
	Boolean False	hard-edges	Hard edges
	Int 3 3-6	lanczos-width	Width of the Lanczos function
	String	transform	Transformation string
	gegl:translate
	Repositions the buffer (with subpixel precision), if integer coordinates are passed a fast-path without resampling is used
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Double 0.00 -inf - +inf	origin-x	X coordinate of origin
	Double 0.00 -inf - +inf	origin-y	Y coordinate of origin
	String linear	filter	Filter type (nearest, linear, lanczos, cubic, lohalo)
	Boolean False	hard-edges	Hard edges
	Int 3 3-6	lanczos-width	Width of the Lanczos function
	Double 1.00 -inf - +inf	x	Horizontal translation
	Double 1.00 -inf - +inf	y	Vertical translation
	gegl:unsharp-mask
	Performs an unsharp mask on the input buffer (sharpens an image by adding false mach-bands around edges)
	Double 1.00 0.00-500.00	std-dev	Standard deviation (spatial scale factor)
	Double 1.00 0.00-100.00	scale	Scale, strength of effect
	gegl:value-invert
	Inverts just the value component, the result is the corresponding `inverted' image.
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	gegl:vector-stroke
	Renders a vector stroke
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Color rgba(0.0000, 0.0000, 0.0000, 0.0000)	color	Color of paint to use for stroking.
	Double 2.00 0.00-200.00	width	The width of the brush used to stroke the path.
	Double 1.00 -2.00-2.00	opacity	Opacity of stroke, note, does not behave like SVG since at the moment stroking is done using an airbrush tool.
	String	transform	svg style description of transform.
	Path	d	A GeglVector representing the path of the stroke
	gegl:vignette
	A vignetting op, applies a vignette to an image. Simulates the luminance fall off at edge of exposed film, and some other fuzzier border effects that can naturally occur with analoge photograpy.
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Int 0 0-2	shape	Shape to use: 0=circle 1=diamond 2=square
	Color rgb(0.0000, 0.0000, 0.0000)	color	Defaults to 'black', you can use transparency here to erase portions of an image
	Double 1.50 0.00-3.00	radius	How far out vignetting goes as portion of half image diagonal
	Double 0.80 0.00-1.00	softness	Softness
	Double 2.00 1.00-20.00	gamma	Falloff linearity
	Double 1.00 0.00-1.00	proportion	How close we are to image proportions
	Double 0.00 -1.00-1.00	squeeze	Aspect ratio to use, -0.5 = 1:2, 0.0 = 1:1, 0.5 = 2:1, -1.0 = 1:inf 1.0 = inf:1, this is applied after proportion is taken into account, to directly use squeeze factor as proportions, set proportion to 0.0.
	Double 0.50 -1.00-2.00	x	Horizontal center of vignetting
	Double 0.50 -1.00-2.00	y	Vertical center of vignetting
	Double 0.00 0.00-360.00	rotation	Rotation angle
	gegl:waves
	Transform the buffer with waves
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Double 0.00 -inf - +inf	x	X coordinate of the center of the waves
	Double 0.00 -inf - +inf	y	Coordinate y of the center of the waves
	Double 25.00 0.00-1000.00	amplitude	Amplitude of the ripple
	Double 200.00 0.00-1000.00	period	Period of the ripple
	Double 0.00 -1.00-1.00	phi	Phase shift
	Enum	sampler-type	Sampler used internally
	gegl:weighted-blend
	blend two images using alpha values as weights
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	Double 0.00 -inf - +inf	value	global value used if aux doesn't contain data
	gegl:write-buffer
	A GEGL buffer destination surface.
	Object	input	Input pad, for image buffer input.
	Object	buffer	Write to an existing GeglBuffer
	svg:clear
	Porter Duff operation clear (d = 0.0f)
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	svg:color-burn
	SVG blend operation color-burn (if cA * aB + cB * aA <= aA * aB: d = cA * (1 - aB) + cB * (1 - aA) otherwise: d = (cA == 0 ? 1 : (aA * (cA * aB + cB * aA - aA * aB) / cA) + cA * (1 - aB) + cB * (1 - aA)))
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	svg:color-dodge
	SVG blend operation color-dodge (if cA * aB + cB * aA >= aA * aB: d = aA * aB + cA * (1 - aB) + cB * (1 - aA) otherwise: d = (cA == aA ? 1 : cB * aA / (aA == 0 ? 1 : 1 - cA / aA)) + cA * (1 - aB) + cB * (1 - aA))
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	svg:darken
	SVG blend operation darken (d = MIN (cA * aB, cB * aA) + cA * (1 - aB) + cB * (1 - aA))
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	svg:difference
	SVG blend operation difference (d = cA + cB - 2 * (MIN (cA * aB, cB * aA)))
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	svg:dst
	Porter Duff operation dst (d = cB)
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	svg:dst-atop
	Porter Duff operation dst-atop (d = cB * aA + cA * (1.0f - aB))
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	svg:dst-in
	Porter Duff operation dst-in (d = cB * aA)
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	svg:dst-out
	Porter Duff operation dst-out (d = cB * (1.0f - aA))
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	svg:dst-over
	Porter Duff operation dst-over (d = cB + cA * (1.0f - aB))
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	svg:exclusion
	SVG blend operation exclusion (d = (cA * aB + cB * aA - 2 * cA * cB) + cA * (1 - aB) + cB * (1 - aA))
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	svg:hard-light
	SVG blend operation hard-light (if 2 * cA < aA: d = 2 * cA * cB + cA * (1 - aB) + cB * (1 - aA) otherwise: d = aA * aB - 2 * (aB - cB) * (aA - cA) + cA * (1 - aB) + cB * (1 - aA))
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	svg:lighten
	SVG blend operation lighten (d = MAX (cA * aB, cB * aA) + cA * (1 - aB) + cB * (1 - aA))
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	svg:overlay
	SVG blend operation overlay (if 2 * cB > aB: d = 2 * cA * cB + cA * (1 - aB) + cB * (1 - aA) otherwise: d = aA * aB - 2 * (aB - cB) * (aA - cA) + cA * (1 - aB) + cB * (1 - aA))
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	svg:plus
	SVG blend operation plus (d = cA + cB)
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	svg:screen
	SVG blend operation screen (d = cA + cB - cA * cB)
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	svg:src
	Porter Duff operation src (d = cA)
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	svg:src-atop
	Porter Duff operation src-atop (d = cA * aB + cB * (1.0f - aA))
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	svg:src-in
	Porter Duff operation src-in (d = cA * aB)
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	svg:src-out
	Porter Duff operation src-out (d = cA * (1.0f - aB))
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	svg:src-over
	Porter Duff operation over (d = cA + cB * (1 - aA))
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	svg:src-over
	Porter Duff operation src-over (d = cA + cB * (1.0f - aA))
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	svg:xor
	Porter Duff operation xor (d = cA * (1.0f - aB)+ cB * (1.0f - aA))
	Object	output	Output pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.