convert RGB to YCbCr

I need to get three channel(three matrix)= Y, Cb, Cr from convert color imag to ycbcr but: the follow function

RGB = imread(colorimage) ycbcr = rgb2ycbcr(RGB)

give alone one channel(luminance)

[Anton Semechko]

try this example:

RGB = imread('board.tif');
YCBCR = rgb2ycbcr(RGB);

do you still get only one channel?

[Aseel H]

I need to sperate channels, Y = [], Cb = [], Cr = [],

[Anton Semechko]

Y=YCBCR(:,:,1);
Cb=YCBCR(:,:,2);
Cr=YCBCR(:,:,3);

[Aseel H]

thanks, Anton

[Aseel H]

can you tell me, how convert RGB to YCbCr integer to integer rgb2ycbcr() give float values.

Answer 1

[Image Analyst]

Does the information in the Help help you:

YCBCR = rgb2ycbcr(RGB) converts the truecolor image RGB to the equivalent image in the YCbCr color space. RGB must be a M-by-N-by-3 array.

If the input is uint8, YCBCR is uint8, where Y is in the range [16 235], and Cb and Cr are in the range [16 240]. If the input is a double, Y is in the range [16/255 235/255] and Cb and Cr are in the range [16/255 240/255]. If the input is uint16, Y is in the range [4112 60395] and Cb and Cr are in the range [4112 61680].