>  There are a number of png files in TDE that generate errors on 
>opening due to
>outdated png header information. I would like to identify which 
>icons these are.
>For example when opening khelpcenter I receive the following 
>messages:
>
>03:03 valhalla:~> khelpcenter help:/khelpcenter/releasenotes
>khelpcenter: WARNING: Main template file name is empty.
>libpng warning: iCCP: known incorrect sRGB profile
>libpng error: IDAT: invalid distance too far back
>libpng error: IDAT: invalid distance too far back
>libpng error: IDAT: invalid distance too far back
>libpng warning: Interlace handling should be turned on when using 
>png_read_image
>libpng error: IDAT: invalid distance too far back
>libpng error: IDAT: invalid distance too far back
>libpng error: IDAT: invalid distance too far back
>libpng warning: Interlace handling should be turned on when using 
>png_read_image
>
>  Apparently, the problem is out-of-date png header information. 
>Searching I
>stumbled across a minimal bit of source that is supposed to fix 
>the issue, but
>only if compiled on older versions of libpng. Looking at the code, 
>the crux of
>it is to rewrite the first 8 bytes of the png header. I've 
>attached it for
>experimentation. It builds well on all of the boxes I have, but I 
>suspect you
>have to force it to build against libpng 1.2 in order for it to do 
>what it is
>supposed to. I'll continue to experiment. If you have few spare 
>minutes give it
>a try and let me know if you can see any discernible difference in 
>the new/old
>png files. I haven't yet.

This is a bug report against newer versions of libpng. I don't seen 
any such errors with libpng 1.4.12.

I suspect a rite of initiation to become a libpng developer is to 
introduce new code that breaks something for everybody downstream. 
Cousins to the BOFH.

Darrell