POV-Ray: Newsgroups: povray.general: Povray writes wrong PNG image size info to partially rendered images: Povray writes wrong PNG image size info to partially rendered images

POV-Ray : Newsgroups : povray.general : Povray writes wrong PNG image size info to partially rendered images : Povray writes wrong PNG image size info to partially rendered images		Server Time 4 Aug 2024 16:10:15 EDT (-0400)

From: George Pantazopoulos
Date: 1 Apr 2003 00:05:45
Message: <3e891e29@news.povray.org>

This bug is related to, and probably the cause of, Christoph Hormann's
observed bug on 21 Jan 2003:
http://news.povray.org/povray.bugreports/29976/

Using povray 3.5 (precompiled binary) (though I suspect this bug is in all
flavors of 3.5)

When using the Partial Output Options +sc +ec +sr +er povray incorrectly
writes the full image size info to the PNG file it generates.

For example, if we did a render with "povray +w1024 +h768 +sc0 +ec255 +sr0
+er255 +fn +otile0.png cornell.pov",
the resulting tile0.png incorrectly reports a width and height of 1024 and
768, respectively. In this case it should be 256 for both cases.

This has the effect of confusing several image readers I've tried, with some
being unable to load the image at all. I came across this bug and confirmed
it while writing libpng code for a program of mine (even libpng refuses to
load the image).

The images CAN be viewed with ACDSee, which reports a corrupt data stream.

Thanks,
George Pantazopoulos

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