It seems that pngstrip (and thus opt-png) strips some transparency, even if not asked. For example, try to opt-png the attached image.
Also, in opt-png.in the error messages on lines 74 and 84 are seemingly mixed up.
Test image for pngstripping
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Bug confirmed. Error messages in opt-png.in are swapped and will be fixed with 1.0.20.
Unwanted transparency stripping happens when the tRNS chuck is used, but not when full alpha channels are used. A tentative bug fix has been identified and is being tested.
The recently-released littleutils 1.0.20 fixes both the unwanted transparency stripping of pngstrip and the confusing error messages in opt-png.in.
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