Colorspace Transformations

Transform colors between sRGB, YCbCr, YPbPr, YUV, YIQ, HSV, HSL, HSI, XYZ, Lab, Luv, LCH, CAT02 LMS

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更新 2011/1/14


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This package converts colors between sRGB, Y'PbPr, Y'CbCr, JPEG-Y'CbCr, Y'UV, Y'IQ, Y'DbDr, HSV, HSL, HSI, CIE XYZ, CIE L*a*b* (CIELAB), CIE L*u*v* (CIELUV), and CIE L*ch (CIELCH), and CIE CAT02 LMS. It can be used either as part of a C/C++ program or compiled as a MATLAB MEX function.

For use in Matlab, colorspace is compiled as a MEX function by entering

mex colorspace.c

on the Matlab command console. As an alternative to MEX, a pure M-code version colorspace.m is also included.

For use in C programs, an example command line program colorcalc is included.

B = colorspace(S,A) converts the color representation of image A where S is a string specifying the conversion. S tells the source and destination color spaces, S = 'dest<-src', or alternatively, S = 'src->dest'. Supported color spaces are
'RGB' = sRGB IEC 61966-2-1
'YPbPr' = Luma (ITU-R BT.601) + Chroma
'YCbCr' = Luma + Chroma
'JPEG-YCbCr' = space used in JPEG
'YUV' = NTSC PAL Y'UV Luma + Chroma
'YIQ' = NTSC Y'IQ Luma + Chroma
'YDbDr' = SECAM Luma + Chroma
'HSV' or 'HSB' = Hue Saturation Value/Brightness
'HSL' or 'HLS' = Hue Saturation Luminance
'HSI' = Hue Saturation Intensity
'Lab' = CIE L*a*b* (CIELAB)
'Luv' = CIE L*u*v* (CIELUV)

All transforms assume 2 degree observer and D65 illuminant. Color space names are case insensitive. When sRGB is the source or destination, it can be omitted. For example 'yuv<-' is short for 'yuv<-rgb'.


Pascal Getreuer (2023). Colorspace Transformations (, MATLAB Central File Exchange. 取得済み .

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added tags, minor update in documentation

* Added missing colorspace.h file---thanks to William Cook
* Added M-code version colorspace.m
* Added JPEG-Y'CbCr
* ITU-R BT.709 gamma correction replaced with more standard sRGB definition
* Fix in Xyz2Luv
* Fix in CIE tongue demo