Effects

blur(blurLevel)
Syntax

0
Minimum

100
Maximum

Applies a Gaussian blur effect, reduces image noise and detail levels.

Sample Blur

?effects=blur(12)

brightness(brightnessLevel)
Syntax

-100
Minimum

100
Maximum

Increases or reduces the image brightness. The colour space used for this is HSL.

Sample Brightness

?effects=brightness(50)

channelExchange(colorChannelSwap)
Syntax

RBG | BGR | BRG | GRB | GBR
Values

Swap RGB color channels.

Sample ChannelExchange

RGBRBGBGRBRGGRBGBR

?effects=channelExchange(BGR)

channelLevel(channel,min,max)
Syntax

all | red | green | blue
Values

0
Minimum

255
Maximum

0
Minimum

255
Maximum

Increases or decreases all color values of the selected channel until they are in the specified range.

Sample ChannelLevel

allredgreenblue

?effects=channelLevel(red,120,160)

channelLevelTrunk(channel,min,max,pad)
Syntax

all | red | green | blue
Values

0
Minimum

255
Maximum

0
Minimum

255
Maximum

0
Minimum

255
Maximum

Sets all color values of the selected channel outside the specified range to the pad value.

Sample ChannelLevelTrunk

?effects=channelLevelTrunk(blue,0,50,50)

channelRGBfilter(color)
Syntax

rrggbb
rgb hex

Applies the specified color filter to the image.

Sample ChannelRGBfilter

?effects=channelRGBFilter(0088ff)

channelSelect(channel)
Syntax

red | green | blue | hue | saturation | brightness
Values

Displays only the information contained in the selected channel.

Sample ChannelSelect

redgreenbluehuesaturationbrightness

?effects=channelselect(red)

colorize(hue,saturation,lightness)
Syntax

0
Minimum

360
Maximum

0
Minimum

100
Maximum

0
Minimum

100
Maximum

Applies a colorize effect to the image. This makes it possible to give a general color impression to the image.

Sample Colorize

?effects=colorize(200,100,0)

colorOverlay(blendmode,color,opacity)
Syntax

Normal | Dissolve | Exclusion | Difference | Hardmix | PinLight | LinearLight | VividLight | HardLight | SoftLight | Overlay | LighterColor | LinearDodgeAdd | ColorDodge | Screen | Lighten | DarkenColor | LinearBurn | ColorBurn | Multiply | Darken | Divide | GrainExtract | GrainMerge | Substract | LuminosityHSL | ColorHSL | SaturationHSL | HueHSL | LuminosityHSB | ColorHSB | SaturationHSB | HueHSB
Values

rrggbb
rgb hex

0
Minimum

100
Maximum

Applies a color overlay to the image using the specified color and blend mode. By using one or perhaps several different effects, many changes in coloration can be achieved.

Sample ColorOverlay

?effects=colorOverlay(Difference,00aeff,50)

contrast(contrastLevel)
Syntax

-100
Minimum

100
Maximum

Increases or reduces the image contrast.

Sample Contrast

?effects=contrast(30)

desaturate(method)
Syntax

average | lightness | luminosity | saturation
Values

Desaturates the specified image property.

Sample Desaturate

averagelightnessluminositysaturation

?effects=desaturate(average)

distort(tlx,tly,trx,try,brx,bry,blx,bly)
Syntax

0.0,0.0
Minimum

1.0,1.0
Maximum

0.0,0.0
Minimum

1.0,1.0
Maximum

0.0,0.0
Minimum

1.0,1.0
Maximum

0.0,0.0
Minimum

1.0,1.0
Maximum

Performs a perspective distortion by moving the image corners to the new specified coordinates. The first two values are the upper left corner, based on a value of 0-1 on the X- and Y-axis. The following corners are to be entered clockwise.

Sample Distort

?effects=distort(0.13,0,0.88,0,1.08,1.13,-0.07,1.13)

fill(color)
Syntax

aarrggbb
argb hex

Fills the image with the specified color considering the alpha channel if it exists in the image.

Sample Fill

?effects=fill(4400ffff)

flip(direction)
Syntax

horizontal | vertical
Values

Flips the image horizontally or vertically.

Sample Flip

horizontalvertical

?effects=flip(horizontal)

gamma(gammaValue,channel)
Syntax

0
Minimum

10
Maximum

all | red | green | blue
Values

Reduces or increases the image gamma.

Sample Gamma

allredgreenblue

?effects=gamma(5.0,red)

glow(glowLevel)
Syntax

0
Minimum

100
Maximum

Adds a glow effect to the image by enlarging and summarizing all bright areas, so you have the impression the image shines.

Sample Glow

?effects=glow(15)

gradientMap(method,color)
Syntax

average | lightness | luminosity
Values

aarrggbb
argb hex

Maps a defined gradient over a grayed image.

Sample GradientMap

averagelightnessluminosity

?effects=gradientMap(average,FF60F0C2)

hsl(hue,saturation,lightness,channel)
Syntax

-180
Minimum

180
Maximum

-100
Minimum

100
Maximum

-100
Minimum

100
Maximum

all | red | yellow | green | cyan | blue | magenta
Values

Allows increase or decrease of the hue, saturation and lightness of a specified image channel.

Sample HSL

?effects=hsl(90,100,0,all)

invert(channel/brightness)
Syntax

brightness | all | red | green | blue | alpha
Values

Inverts one channel, all channels or the brightness of the image.

Sample Invert

brightnessallredgreenbluealpha

?effects=invert(brightness)

matte(color)
Syntax

rrggbb
rgb hex

Removes transparency and renders all translucent pixel against the matte color.

Sample Matte

?effects=matte(00ffff)

noise(amount,strength,monochrome)
Syntax

0
Minimum

100
Maximum

0
Minimum

100
Maximum

true | false
Values

Adds noise to the image.

Sample Noise

?effects=noise(50,70,true)

opaque()
Syntax

Removes the Alpha Channel from an image if it exists.

Sample Opaque

?effects=opaque()

overlays(image(opacity,position,xOffset,yOffset))
Syntax

path/to/image
Asset path

0
Minimum

100
Maximum

TL | TC | TR | CL | CC | CR | BL | BC | BR
Values

0
integer

0
integer

Adds an overlay to the image. This effect is always applied before all other effects.

Sample Overlays

TLTCTRCLCCCRBLBCBR

?&renderer=overlay&overlays=_service/demo_watermark.png(90,CC,0,0)

pad(position,color)
Syntax

TL | TC | TR | CL | CC | CR | BL | BC | BR
Values

aarrggbb
argb hex

Pads the image to fit the requested size exactly, placing the actual image on the colored canvas at the specified position.

Sample Pad

?&effects=pad(cc,ff00ffff)

pixelize(pixelizeStrength)
Syntax

0
Minimum

100
Maximum

Creates a pixel effect by reducing the image details. The pixel colors adapt to the most common used color around each pixel, resulting in a tile effect.

Sample Pixelize

?effects=pixelize(9)

posterize(threshold)
Syntax

0
Minimum

255
Maximum

Applies a posterize effect, reducing the image to a limited number of color levels. Posterize is a separation of the tonal values with a simultaneous tonal value reduction.

Sample Posterize

?effects=posterize(2)

saturation(mode,strength)
Syntax

HSL | YIQ
Values

-100
Minimum

100
Maximum

Changes the image saturation.

Sample Saturation

?effects=saturation(HSL,-50)

select(command,range,rangeParameters)
Syntax

New | Add | Sub | Clear | Invert
Values

Path | Alpha | Rect
Values

see below
Selection

Limit subsequent effects to image regions using clipping paths and/or alpha channels. Supported commands:

• New: clears old and starts a new selection.
• Add: adds region to existing selection.
• Sub: subtracts region from existing selection.
• Clear: clears the current selection.
• Invert: inverts the current selection.

The New, Add and Sub commands require a range with appropriate rangeparameters.

Possible range values are:

• Path: Selects a path defined in the image. Requires the number of the path as range parameter.
• Alpha: Selects one of the alpha channels defined in the image. Requires the number of the alpha channel as range parameter.
• Rect: Selects a rectangular region within the image. Requires the rectangle coordinates as range parameters.

Sample Select

NewAddSubClearInvert

?effects=select(New,Alpha,1),colorize(200,100,0)

sepia()
Syntax

Makes the image look like a sepia toned photo.

Sample Sepia

?effects=sepia()

sharpen(strength)
Syntax

0
Minimum

100
Maximum

Sharpens the image using a Gaussian unsharpen algorithm. Especially details and contours will be highlighted.

Sample Sharpen

?effects=sharpen(50)

solarize()
Syntax

Applies a solarize effect that negates all pixels above a certain value. Solarization allows the alienation of images.

Sample Solarize

?effects=solarize()

temperature(colorTemperature)
Syntax

-100
Minimum

100
Maximum

Changes the image color temperature.

Sample Temperature

?effects=temperature(-70)

threshold(levelLow,levelHigh,color1,color2)
Syntax

0
Minimum

255
Maximum

0
Minimum

255
Maximum

rrggbb
rgb hex

rrggbb
rgb hex

Reduces the color range of the images by applying a threshold filter.

Sample Threshold

?effects=threshold(55,170,E05555,E3E85B)

transparency(transparencyLevel)
Syntax

0
Minimum

100
Maximum

Adds transparency to the image. If the image contains an alpha channel it will be strengthened. If there is no alpha channel in the image, then one will be created.

Sample Transparency

?effects=transparency(70)