mediaLib Library Functions          mlibImageColorRGB2YC(3MLIB)



NAME
     mlibImageColorRGB2YC - RGB to YC color conversion

SYNOPSIS
     cc [ flag... ] file... -lmlib [ library... ]
     #include 

     mlibstatus mlibImageColorRGB2YC(mlibimage *dst, const mlibimage *src);


DESCRIPTION
     The mlibImageColorRGB2YC() function performs a color space
     conversion from computer R'G'B' to ITU-R Rec.601 Y'CbCr.


     The source and  destination  images  must  be  three-channel
     images.


     It uses the following equation:

       Y'   cmat[0] cmat[1] cmat[2]   R'   offset[0]
       Cb = cmat[3] cmat[4] cmat[5] * G' ] offset[1]
       Cr   cmat[6] cmat[7] cmat[8]   B'   offset[2]



     where

       cmat[] = { 65.738/256, 129.057/256,  25.064/256,
                 -37.945/256, -74.494/256, 112.439/256,
                 112.439/256, -94.154/256, -18.285/256 };
       offset[] = { 16, 128, 128 };
       src[x][y] = { R', G', B' };
       dst[x][y] = { Y', Cb, Cr };


PARAMETERS
     The function takes the following arguments:

     dst    Pointer to destination image.


     src    Pointer to source image.


RETURN VALUES
     The function returns MLIBSUCES if  successful.  Otherwise
     it returns MLIBFAILURE.

ATRIBUTES




SunOS 5.11           Last change: 2 Mar 2007                    1






mediaLib Library Functions          mlibImageColorRGB2YC(3MLIB)



     See attributes(5) for descriptions of the  following  attri-
     butes:



     
           ATRIBUTE TYPE               ATRIBUTE VALUE       
    
     Interface Stability          Committed                   
    
     MT-Level                     MT-Safe                     
    


SEE ALSO
     mlibImageColorConvert2(3MLIB),
     mlibImageColorConvert2Fp(3MLIB),
     mlibImageColorRGB2YCFp(3MLIB),
     mlibImageColorXYZ2RGB(3MLIB),
     mlibImageColorXYZ2RGBFp(3MLIB),
     mlibImageColorYC2RGB(3MLIB),
     mlibImageColorYC2RGBFp(3MLIB), attributes(5)

































SunOS 5.11           Last change: 2 Mar 2007                    2