Re: [Algorithms] RGB to XYZ conversion

[Mat N. <mat...@bu...>]

He missed a few signs:

> [y,Co,Cg]' = [1/4, 1/2, 1/4].[r,g,b]'
>              [1/2, 0,   -1/2]
>              [-1/4, 1/2, -1/4]

MSN
-----Original Message-----
From: gda...@li... [mailto:gda...@li...] On Behalf Of Jon Watte
Sent: Wednesday, April 23, 2008 10:58 AM
To: Game Development Algorithms
Subject: Re: [Algorithms] RGB to XYZ conversion

Sam Martin wrote:
> We recall from [1] that the direct YCoCg color space transform is defined by:
> [y,Co,Cg]' = [1/4, 1/2, 1/4].[r,g,b]'
>              [1/2, 0,   1/2]
>              [1/4, 1/2, 1/4]
>

That can't be right, as it collapses RGB into equal values for y and Cg.
You can't possibly reconstruct RGB from that.

sincerely,

jw



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