Re: [WM]: ycbcr color model?

[Angela Piper <amp08@uow.edu.au>]

The YCbCr model is one of the many 3-component colour models and is obtainable from gamma corrected RGB through a linear transform.

Y represents the luminance of the image (so viewing the Y component only would give you a greyscale version of your image), the Cb
component (blue chrominance) describes the areas of blue/yellow and the Cr component (red chrominance) describes the areas of
red/green.

The importance of this space is twofold:
Firstly, it is thought to correspond reasonably well with how colour signals are received by the brain (in that we perceive an area
of colour as bluish or yellowish but not both). 
More importantly, YCbCr provides excellent compression performance and is thus widely used in image compression and component
digital video.

If you need more information I'd suggest you look for textbooks on colour theory or image coding or perhaps take a look at Charles
Poynton's FAQ.

Yours,
	Angela.


On Mon, May 02, 2005 at 12:50:06AM -0700, rajan sheth wrote:
> hi friends
> 
> inorder to extend the grayscale invisible algorithm to color images i came to know abt the use of "ycbcr"
> color model.
> 
> for that we have to convert the RGB values in to ycbcr model. and then apply the algorithm.
> 
> can any one plz tell me more about the "ycbcr color model"(its basic explanation and importance).
> 
> thanking you in advance.....
> 
> waiting........
> rajan
> 


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