Re: JPEG (JFIF) - final steps

"Adam Wnêk" wrote:
> 
> Hi
> 
> I build my own JFIF decoder, but it is a trouble with colors. When i decode
> luminance only it is not bad. I see the right shapes like an inverse of
> image (where color is black, that's not working fine :(). When I convert
> from Y Cb Cr to RGB the colors are wrong. On grayscaled image (3 components)
> i see a red-blue image (the truth is I always see red-blue image and
> yellow).
> I read about sampling, but in my test image I have always set X sample and Y
> sample to 1. So I don't resample the image. Is this wrong ?
> Can anyone help me ?

http://www.wotsit.org/
http://www.ijg.org/

a very simple decoder: ftp://137.193.64.130/pub/jpeg/pfp.zip