Re: [Jpeg-users] libjpeg 6c ?

[Guido V. <gu...@jp...>]

paul van den berg wrote:
> 
> But if you run 'make -i test' on the 6c source with testimages
> from ijg-source you get:

But why would you run the test of 6c with testimages from 6b?
One of the improvements of this 6c package is that it has got
its own corrected testimages!  The testimages from 6b cannot
work with 6c/7, because I have introduced a more correct method
for the internal color subsampling processing.  The method used
in 6b is inferior and has serious shortcomings.  6c/7 solves
these problems by using the same new direct DCT scaling
functions for the color subsampling as for the image rescaling.
The compressed testimages had to be adapted (recreated with new
method) for the new version.  There is nothing wrong with this,
it's actually a feature, not a bug!

Regards
Guido Vollbeding
Organizer Independent JPEG Group