Re: Subtracting G channel from R and B may increase lossless compression?


"LiloLilo" <danilo.brambilla@xxxxxxxx> wrote in message
news:4655e5ba$0$16029$5fc30a8@xxxxxxxxxxxxxxxxxx
Thank you very much. Very userfull link.

It seems that this kind of transformation would be quite different from
the usual YUV. Do you think that this difference would be small? Is there
any comparison between them?


actually, they are at least vaguely similar.


Suppose I have now converted my color space from RGB to YUV and let's
speak again of channel differencing. The correct differencing now wold be
U-Y, V-Y and Y?


no, this is a bad idea with YUV, because this particular relation is already
implied by the transform itself (and as such, doing such an operation would
only serve to re-correlate it...).

for example, with a typical YUV-based representation, if U and V are always
128, the image is greyscale.

or such...


Thank you all for help, you are great!


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