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.

effects

porter-duff

meta

misc

compositors

core

edge

programming

math

transform

blend

enhance

video

blur

color

output

input

svgfilter

render

transparency

	gegl:add
	Math operation add (c = c + value)
	Object	output	Ouput 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	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Double 4.00 0.00-70.00	blur-radius	Radius of square pixel region, (width and height will be radius*2+1).
	Double 8.00 0.00-70.00	edge-preservation	Amount of edge preservation
	gegl:box-blur
	Performs an averaging of a square box of pixels.
	Object	output	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Double 4.00 0.00-200.00	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	Ouput 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	Ouput 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	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Int 300 2-3000	radius	Neighbourhood taken into account, this is the radius in pixels taken into account when deciding which colors map to which gray values.
	Int 4 0-1000	samples	Number of samples to do per iteration looking for the range of colors.
	Int 10 0-1000	iterations	Number of iterations, a higher number of iterations provides a less noisy results at computational cost.
	gegl:checkerboard
	Checkerboard renderer
	Object	output	Ouput 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	color1	One of the cell colors (defaults to 'black')
	Color	color2	The other cell color (defaults to 'white')
	gegl:clear
	Porter Duff operation clear (d = 0.0)
	Object	output	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	gegl:clone
	Clone a buffer
	Object	output	Ouput 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	Ouput pad for generated image buffer.
	Color	value	The color to render (defaults to 'black')
	gegl: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	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	gegl: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	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	gegl:color-temperature
	Allows changing the color temperature of an image.
	Object	output	Ouput 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:contrast-curve
	Adjusts the contrast of the image according to a curve.
	Object	output	Ouput 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	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	String RGBA float.	format	Babl ouput format string
	gegl:crop
	Crop a buffer
	Object	output	Ouput 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:darken
	SVG blend operation darken (d = MIN (cA * aB, cB * aA) + cA * (1 - aB) + cB * (1 - aA))
	Object	output	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	gegl:difference
	SVG blend operation difference (d = cA + cB - 2 * (MIN (cA * aB, cB * aA)))
	Object	output	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	gegl:difference-of-gaussians
	Does an edge detection based on the difference of two gaussian blurs.
	Double 1.00 0.00-10.00	radius1	Radius
	Double 2.00 0.00-10.00	radius2	Radius
	gegl:display
	Displays the input buffer in an SDL window (restricted to one display op/process, due to SDL implementation issues, a gtk+ based replacement would be nice.
	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:divide
	Math operation divide (c = value==0.0?0.0:c/value)
	Object	output	Ouput 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 -10.00-10.00	opacity	Opacity
	Double 20.00 -inf - +inf	x	Horizontal shadow offset.
	Double 20.00 -inf - +inf	y	Vertical shadow offset.
	Double 10.00 -inf - +inf	radius	Blur radius.
	gegl:dst
	Porter Duff operation dst (d = cB)
	Object	output	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	gegl:dst-atop
	Porter Duff operation dst-atop (d = cB * aA + cA * (1 - aB))
	Object	output	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	gegl:dst-in
	Porter Duff operation dst-in (d = cB * aA)
	Object	output	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	gegl:dst-out
	Porter Duff operation dst-out (d = cB * (1 - aA))
	Object	output	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	gegl:dst-over
	Porter Duff operation dst-over (d = cB + cA * (1 - aB))
	Object	output	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	gegl:exclusion
	SVG blend operation exclusion (d = (cA * aB + cB * aA - 2 * cA * cB) + cA * (1 - aB) + cB * (1 - aA))
	Object	output	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	gegl:fractal-explorer
	Fractal Explorer
	Object	output	Ouput pad for generated image buffer.
	Int 400 10-10000000	width	Width
	Int 400 10-10000000	height	Height
	Int 0 0-8	fractaltype	Fractal Type
	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	Ouput 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 neighbouring pixels with the normal distribution as weighting.
	Object	output	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Double 4.00 0.00-200.00	std-dev-x	Standard deviation for the horizontal axis. (multiply by ~2 to get radius)
	Double 4.00 0.00-200.00	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	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	gegl: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	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	gegl:introspect
	GEGL graph visualizer.
	Object	output	Ouput 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	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	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:levels
	Remaps the intensity range of the image
	Object	output	Ouput 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:lighten
	SVG blend operation lighten (d = MAX (cA * aB, cB * aA) + cA * (1 - aB) + cB * (1 - aA))
	Object	output	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	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:mblur
	Accumulating motion blur
	Object	output	Ouput 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:mono-mixer
	Monochrome channel mixer
	Object	output	Ouput 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:multiply
	Math operation multiply (c = c * value)
	Object	output	Ouput 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:nop
	No operation (can be used as a routing point)
	Object	output	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	gegl:normal
	Porter Duff operation over (d = cA + cB * (1 - aA))
	Object	output	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	gegl:opacity
	Weights the opacity of the input both the value of the aux input and the global value property.
	Object	output	Ouput 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	Ouput pad for generated image buffer.
	String	path	a GeglBuffer on disk to open
	gegl:over
	Porter Duff operation over (d = cA + cB * (1 - aA))
	Object	output	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	gegl: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	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	gegl:path
	Renders a brush stroke
	Object	output	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Color	fill	Color of paint to use for filling, use 0 opacity to disable filling.
	Color	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 brush, 0.0 for soft brush 1.0 for 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	Ouput 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	Ouput pad for generated image buffer.
	Pointer	pixbuf	GdkPixbuf to use
	gegl:plus
	SVG blend operation plus (d = cA + cB)
	Object	output	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	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: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 False	rawformat	Raw format
	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	color	Color to render
	gegl:reflect
	Object	output	Ouput 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)
	Boolean False	hard-edges	Hard edges
	Int 3 3-6	lanczos-width	Width of 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:remap
	Linearly remap the R,G,B based on per pixel minimum and maximum values from the high/low input pads
	gegl:rotate
	Rotate the buffer around the specified origin.
	Object	output	Ouput 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)
	Boolean False	hard-edges	Hard edges
	Int 3 3-6	lanczos-width	Width of lanczos function
	Double 0.00 -inf - +inf	degrees	Angle to rotate (clockwize)
	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	Ouput 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)
	Boolean False	hard-edges	Hard edges
	Int 3 3-6	lanczos-width	Width of lanczos function
	Double 1.00 -inf - +inf	x	Horizontal scale factor.
	Double 1.00 -inf - +inf	y	Vertical scale factor.
	gegl:screen
	SVG blend operation screen (d = cA + cB - cA * cB)
	Object	output	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	gegl:shear
	Shears the buffer.
	Object	output	Ouput 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)
	Boolean False	hard-edges	Hard edges
	Int 3 3-6	lanczos-width	Width of 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	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Double 8.00 0.00-70.00	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	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	gegl:src
	Porter Duff operation src (d = cA)
	Object	output	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	gegl:src-atop
	Porter Duff operation src-atop (d = cA * aB + cB * (1 - aA))
	Object	output	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	gegl:src-in
	Porter Duff operation src-in (d = cA * aB)
	Object	output	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	gegl:src-out
	Porter Duff operation src-out (d = cA * (1 - aB))
	Object	output	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.
	gegl:src-over
	Porter Duff operation src-over (d = cA + cB * (1 - aA))
	Object	output	Ouput 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	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Int 300 2-3000	radius	Neighbourhood taken into account, for enhancement ideal values are close to the longest side of the image, increasing this increases the runtime.
	Int 4 0-1000	samples	Number of samples to do per iteration looking for the range of colors.
	Int 10 0-1000	iterations	Number of iterations, a higher number of iterations provides a less noisy rendering at 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	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	gegl:subtract
	Math operation subtract (c = c - value)
	Object	output	Ouput 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	Ouput 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	Ouput 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	Ouput 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	Ouput 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	Ouput 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	Ouput 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	Ouput 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	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	Ouput 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:tonemap
	Local contrast enhancement
	Double 20.00 0.00-100.00	radius	radius
	Double 15.00 0.00-100.00	blur	blur
	Double 0.50 -1.00-2.00	amount	amount
	gegl:transform
	Transforms the group (used by svg).
	Object	output	Ouput 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)
	Boolean False	hard-edges	Hard edges
	Int 3 3-6	lanczos-width	Width of lanczos function
	String	transform	Transformation string
	gegl:translate
	Repositions the buffer (with subpixel precision).
	Object	output	Ouput 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)
	Boolean False	hard-edges	Hard edges
	Int 3 3-6	lanczos-width	Width of 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 0.00-100.00	std-dev	Standard deviation (spatial scale factor)
	Double 1.00 0.00-100.00	scale	Scale, strength of effect.
	gegl:v4l
	Video4Linux input, webcams framegrabbers and similar devices.
	Object	output	Ouput pad for generated image buffer.
	FilePath /dev/video0	path	Path to v4l device
	Int 320 0- +inf	width	Width for rendered image
	Int 240 0- +inf	height	Height for rendered image
	Int 0 0- +inf	frame	current frame number, can be changed to trigger a reload of the image.
	Int 0 0- +inf	fps	autotrigger reload this many times a second.
	gegl:value-invert
	Inverts just the value component, the result is the corresponding `inverted' image.
	Object	output	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	gegl:weighted-blend
	blend two images using alpha values as weights
	Object	output	Ouput 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:whitebalance
	Allows changing the whitepoint and blackpoint of an image.
	Object	output	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Double 0.00 -2.00-2.00	high-a-delta	not documented
	Double 0.00 -2.00-2.00	high-b-delta	not documented
	Double 0.00 -2.00-2.00	low-a-delta	not documented
	Double 0.00 -2.00-2.00	low-b-delta	not documented
	Double 1.00 -3.00-3.00	saturation	not documented
	gegl:write-buffer
	A GEGL buffer destination surface.
	Object	input	Input pad, for image buffer input.
	Object	buffer	Write to an existing GeglBuffer
	gegl:xor
	Porter Duff operation xor (d = cA * (1 - aB)+ cB * (1 - aA))
	Object	output	Ouput pad for generated image buffer.
	Object	input	Input pad, for image buffer input.
	Object	aux	Auxiliary image buffer input pad.