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ColorReplace[image,color]

finds regions in image whose pixel values are similar to color and replaces them with transparent pixels.

ColorReplace[image,colorreplacement]

replaces all pixels with the specified replacement color.

ColorReplace[image,colorreplacement,d]

replaces all pixels whose values are within a distance d from color.

ColorReplace[image,{color1replacement1,…},{d1,…}]

does multiple color replacements.

Details
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Basic Examples  
Scope  
Applications  
Properties & Relations  
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ColorReplace

ColorReplace[image,color]

finds regions in image whose pixel values are similar to color and replaces them with transparent pixels.

ColorReplace[image,colorreplacement]

replaces all pixels with the specified replacement color.

ColorReplace[image,colorreplacement,d]

replaces all pixels whose values are within a distance d from color.

ColorReplace[image,{color1replacement1,…},{d1,…}]

does multiple color replacements.

Details

Examples

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Basic Examples  (2)

Replace a background with transparency:

Wolfram Language code: ColorReplace[[image], Yellow]

Replace black pixels in an image:

Wolfram Language code: ColorReplace[[image], Black -> Pink]

Scope  (4)

Use a selected color to specify the pixel values to be replaced:

Wolfram Language code: ColorReplace[[image], RGBColor[{223/255, 14/17, 61/85}] -> Red]

Use a marker image to specify the pixel values to be replaced:

Wolfram Language code: ColorReplace[[image], [image] -> Red]

Specify a distance value:

Wolfram Language code: ColorReplace[[image], [image] -> Red, 0.2]

Specify multicolor replacement and a default background:

Wolfram Language code: ColorReplace[[image], {RGBColor[0.7, 0.02, 0.15] -> White, RGBColor[0.4, 0.6, 0.2] -> Gray, _ -> Black}]

Replace red pixels in a 3D image:

Wolfram Language code: ColorReplace[[image], Red -> Yellow]

Applications  (4)

Green screen replacement:

Wolfram Language code: ColorReplace[[image], Green, .25]

Change the plot color:

Wolfram Language code: ColorReplace[[image], Red -> Green, .3]

Also remove the axes:

Wolfram Language code: ColorReplace[%, Black -> White]

Remove background colors with white:

Wolfram Language code: ColorReplace[[image], {LightYellow -> White, Yellow -> White}, .15]

Shuffle colors on a logo by random color replacement:

Wolfram Language code: i = [image];

Find dominant colors in the image and generate random replacement:

Wolfram Language code: colors = DominantColors[i]
Wolfram Language code: replacements = RandomColor[Length[colors]]

Replace colors:

Wolfram Language code: ColorReplace[RemoveAlphaChannel[i], Prepend[Thread[Rule[colors, replacements]], White -> White]]

Properties & Relations  (2)

Replacing pixels of a grayscale image with color values will result in a color image:

Wolfram Language code: ColorReplace[[image], Black -> Red, .2]

Use DominantColors to find the dominant green color to be replaced:

Wolfram Language code: image = [image]; g = Nearest[DominantColors[image, 10], Green, DistanceFunction -> ColorDistance]

Replace the detected shade of green with transparent:

Wolfram Language code: ColorReplace[image, g]
Wolfram Research (2012), ColorReplace, Wolfram Language function, https://reference.wolfram.com/language/ref/ColorReplace.html (updated 2014).

Text

Wolfram Research (2012), ColorReplace, Wolfram Language function, https://reference.wolfram.com/language/ref/ColorReplace.html (updated 2014).

CMS

Wolfram Language. 2012. "ColorReplace." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2014. https://reference.wolfram.com/language/ref/ColorReplace.html.

APA

Wolfram Language. (2012). ColorReplace. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/ColorReplace.html

BibTeX

@misc{reference.wolfram_2026_colorreplace, author="Wolfram Research", title="{ColorReplace}", year="2014", howpublished="\url{https://reference.wolfram.com/language/ref/ColorReplace.html}", note=[Accessed: 13-June-2026]}

BibLaTeX

@online{reference.wolfram_2026_colorreplace, organization={Wolfram Research}, title={ColorReplace}, year={2014}, url={https://reference.wolfram.com/language/ref/ColorReplace.html}, note=[Accessed: 13-June-2026]}