Re: Subtracting G channel from R and B may increase lossless compression?
- From: CBS <cbs.strutz@xxxxxx>
- Date: Wed, 23 May 2007 21:57:05 +0200
see
http://www.jpeg.org/.demo/FAQJpeg2k/functionalities.htm#What%20is%20the%20RCT?
for lossless colour transform
Regards,
CBS
LiloLilo wrote:
I was looking for lossless conversion from RGB to YUV but I found out.
that this kind of conversion isn't possible in a lossless way because of
several RGB colors represent the same YUV color
(http://www.doom9.org/index.html?/capture/digital_video_color.html).
Please could you provide more information about this point?
Thank you very much.
Danilo
"Jim Leonard" <MobyGamer@xxxxxxxxx> wrote in message
news:1179930643.817061.276640@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On May 22, 3:58 pm, "LiloLilo" <danilo.brambi...@xxxxxxxx> wrote:
anybody knows how subtracting G channel from R and from B could
increase
lossless compression? I did some tests on some images and found out that
this is true but not for all images. Images with more noise compress
worst.
Do you think that subtracting for example the R channel or the B channel
instead of G would be different?
It depends on the source material. Better correlation is always found
if you convert the RGB image into a YUV image (the transform is
reversable; losslessly if you have enough precision).
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