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ColorReplace
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ColorReplace

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ColorReplace[image,color]

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

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ColorReplace[image,colorreplacement]

replaces all pixels with the specified replacement color.

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ColorReplace[image,colorreplacement,d]

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

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

does multiple color replacements.

Details

Examples

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Basic Examples  (2)Summary of the most common use cases

Replace a background with transparency:

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In[1]:=1
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https://wolfram.com/xid/0cg3xwh5u-fmk60z
Direct link to example
Out[1]=1

Replace black pixels in an image:

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In[1]:=1
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https://wolfram.com/xid/0cg3xwh5u-0vyc0a
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Out[1]=1

Scope  (4)Survey of the scope of standard use cases

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

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In[7]:=7
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https://wolfram.com/xid/0cg3xwh5u-f2vyoj
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Out[7]=7

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

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In[1]:=1
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https://wolfram.com/xid/0cg3xwh5u-ncg0yc
Direct link to example
Out[1]=1

Specify a distance value:

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In[2]:=2
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https://wolfram.com/xid/0cg3xwh5u-dt2m3e
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Out[2]=2

Specify multicolor replacement and a default background:

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In[1]:=1
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https://wolfram.com/xid/0cg3xwh5u-nmwstt
Direct link to example
Out[1]=1

Replace red pixels in a 3D image:

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In[1]:=1
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https://wolfram.com/xid/0cg3xwh5u-b53tpu
Direct link to example
Out[1]=1

Applications  (4)Sample problems that can be solved with this function

Green screen replacement:

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In[2]:=2
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https://wolfram.com/xid/0cg3xwh5u-h463m
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Out[2]=2

Change the plot color:

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In[1]:=1
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https://wolfram.com/xid/0cg3xwh5u-uqdp5h
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Out[1]=1

Also remove the axes:

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In[2]:=2
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https://wolfram.com/xid/0cg3xwh5u-mcik4c
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Out[2]=2

Remove background colors with white:

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In[1]:=1
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https://wolfram.com/xid/0cg3xwh5u-eezupg
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Out[1]=1

Shuffle colors on a logo by random color replacement:

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In[1]:=1
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https://wolfram.com/xid/0cg3xwh5u-vs0vnh
Direct link to example

Find dominant colors in the image and generate random replacement:

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In[2]:=2
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https://wolfram.com/xid/0cg3xwh5u-f98auf
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Out[2]=2
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In[3]:=3
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https://wolfram.com/xid/0cg3xwh5u-446czp
Direct link to example
Out[3]=3

Replace colors:

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In[4]:=4
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https://wolfram.com/xid/0cg3xwh5u-nng73r
Direct link to example
Out[4]=4

Properties & Relations  (2)Properties of the function, and connections to other functions

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

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In[4]:=4
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https://wolfram.com/xid/0cg3xwh5u-3nroph
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Out[4]=4

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

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In[1]:=1
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https://wolfram.com/xid/0cg3xwh5u-sdrc2s
Direct link to example
Out[1]=1

Replace the detected shade of green with transparent:

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In[2]:=2
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https://wolfram.com/xid/0cg3xwh5u-b4j946
Direct link to example
Out[2]=2
Wolfram Research (2012), ColorReplace, Wolfram Language function, https://reference.wolfram.com/language/ref/ColorReplace.html (updated 2014).
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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).

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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.

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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

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

BibTeX

@misc{reference.wolfram_2025_colorreplace, author="Wolfram Research", title="{ColorReplace}", year="2014", howpublished="\url{https://reference.wolfram.com/language/ref/ColorReplace.html}", note=[Accessed: 30-March-2025 ]}

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@misc{reference.wolfram_2025_colorreplace, author="Wolfram Research", title="{ColorReplace}", year="2014", howpublished="\url{https://reference.wolfram.com/language/ref/ColorReplace.html}", note=[Accessed: 30-March-2025 ]}

BibLaTeX

@online{reference.wolfram_2025_colorreplace, organization={Wolfram Research}, title={ColorReplace}, year={2014}, url={https://reference.wolfram.com/language/ref/ColorReplace.html}, note=[Accessed: 30-March-2025 ]}

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@online{reference.wolfram_2025_colorreplace, organization={Wolfram Research}, title={ColorReplace}, year={2014}, url={https://reference.wolfram.com/language/ref/ColorReplace.html}, note=[Accessed: 30-March-2025 ]}