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This tool is extremely useful - but lacks PNG support to be perfect :)
If it's not a licensing issue, please add.
Sorry for not responding to this originally but I've just released version 1.0 of the software and am trying to close out old issues.
DJV has had PNG support for some time but it was disabled on some platforms due to an issue with the build system. This has been fixed with the 1.0 release and all platforms now support PNG.