`ColorConvert`¶

Convert between color spaces.

$ wo 'ColorConvert[RGBColor[1, 0, 0], "CMYK"]'
CMYKColor[0., 1., 1., 0.]

$ wo 'ColorConvert[RGBColor[1, 0, 0], "HSB"]'
Hue[0., 1., 1.]

Hue and CMYKColor are accepted as inputs too.

$ wo 'ColorConvert[CMYKColor[0, 1, 1, 0], "RGB"]'
RGBColor[1., 0., 0.]

A converted image records the space it was converted to, where one that was never converted has none:

$ wo 'ImageColorSpace[ColorConvert[Image[{{0., 1.}}], "RGB"]]'
RGB

$ wo 'ImageColorSpace[Image[{{0., 1.}}]]'
Automatic

Images convert between the same spaces the color directives do, pixel by pixel. In "HSB" red is hue 0 and green is hue ⅓, both fully saturated:

$ wo 'ImageData[ColorConvert[Image[{{{1., 0., 0.}, {0., 1., 0.}}}], "HSB"]]'
{{{0., 1., 1.}, {0.3333333432674408, 1., 1.}}}

$ wo 'ImageData[ColorConvert[Image[{{{1., 0., 0.}}}], "CMYK"]]'
{{{0., 1., 1., 0.}}}

A grayscale image is read as the gray RGB it stands for, so it gains the extra channels:

$ wo 'ImageChannels[ColorConvert[Image[{{0.5}}], "CMYK"]]'
4

An alpha channel is not a color channel and rides along unchanged:

$ wo 'ImageData[ColorConvert[Image[{{{1., 0., 0., 0.25}}}], "HSB"]]'
{{{0., 1., 1., 0.25}}}

ColorConvert¶