Hello!
I use jmol inside SageMath which I build from source. Currently this is
Sage 7.6 which comes with jmol-14.6.1_2016.07.11 from which it uses
jsmol. When producing a 3d graphic one has the option of saving or
exporting files in various formats from a context menu. One of them is
PNG files, namely "export PNG image". The files produced in this manner
fail to pass testing with the pngcheck utility. Opening the file with
gimp and exporting to png format one ends up with a smaller file without
apparent image quality loss which is considered OK by pngcheck. Is this
intended behavior and the file getting some extra information, or some bug?
Typical output of pngcheck in one of these files:
pngcheck Fromjmol.png
Fromjmol.png additional data after IEND chunk
ERROR: Fromjmol.png
The file in question is available at:
https://drive.google.com/file/d/0BxvQu5VZ1xbeODl6R01aMVJSeFE/view?usp=sharing
I believe jmol is not particularly changed by sage and this probably the
best place to ask the question. Sorry, if this not the case.
Best, and thanks for Jmol,
João Palhoto Matos
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