2012.07.06 16:17 "Re: [Tiff] Crash in raw_decode with libjpeg 8d (was Re: tiff 4.0.2 raw_decode test failing on ppc64)", by Bob Friesenhahn

What version of libjpeg are you testing with?

Not speaking for others, but I suspect that old-timers like me still use the old good libjpeg 6b :-)

Debian is well into the transition to follow IJG JPEG. It is indeed true that there are multiple players now, including antique JPEG 6b.

I followed the advice and tried the following patch:

Thanks for this.

Which fixes the crash with 8b and make valgrind happy.

The ./raw_decode test still passes fine with jpeg 6b, but generates the following errors with 8b (after commenting the early exit in case of failures)

IJG JPEG 7+ use a new upsampling algorithm which is supposed to reduce round-trip error due to the sampling. However, I have noticed that it produces larger error or different results for certain files written with 6b.

Bob
--
Bob Friesenhahn
bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/