Function: rgb2jpeg
RGB2JPEG  Coverts from RGB format to the YCbCr format used by JPEG 
  Usage:  YCbCr = rgb2jpeg(RGB);

  Input parameters:
        RGB   : 3d data-cube, containing RGB information of the image

  Output parameters:
        YCbCr : 3d data-cube, containing the YCbCr information of the
                image

  'rgb2jpeg(RGB)' performs a transformation of the 3d data-cube RGB with
  dimensions N xM x3, which contains information of the
  colours "red", "green" and "blue". The output variable YCbCr is a 3d
  data-cube of the same size containing information about "luminance",
  "chrominance blue" and "chrominance red". The output will be of
  the uint8 type.

  See http://en.wikipedia.org/wiki/YCbCr and
  http://de.wikipedia.org/wiki/JPEG.

  Examples:
  ---------

  In the following example, the Lichtenstein test image is split into
  its three components. The very first subplot is the original image:

   f=lichtenstein;

   f_jpeg=rgb2jpeg(f);

   subplot(2,2,1);
   image(f);axis('image');

   Ymono=zeros(512,512,3,'uint8');
   Ymono(:,:,1)=f_jpeg(:,:,1);
   Ymono(:,:,2:3)=128;
   fmono=jpeg2rgb(Ymono);
   subplot(2,2,2);
   image(fmono);axis('image');

   Cbmono=zeros(512,512,3,'uint8');
   Cbmono(:,:,2)=f_jpeg(:,:,2);
   Cbmono(:,:,3)=128;
   fmono=jpeg2rgb(Cbmono);
   subplot(2,2,3);
   image(fmono);axis('image');

   Crmono=zeros(512,512,3,'uint8');
   Crmono(:,:,3)=f_jpeg(:,:,3);
   Crmono(:,:,2)=128;
   fmono=jpeg2rgb(Crmono);
   subplot(2,2,4);
   image(fmono);axis('image');

Url: http://ltfat.github.io/doc/sigproc/rgb2jpeg.html

See also: jpeg2rgb.

Package: ltfat