The version of icns2png included in Gentoo is very old and has numerous bugs. A much more recent version with newer features and fixed bugs can be found at http://sourceforge.net/projects/icns/ Reproducible: Always Steps to Reproduce: 1. Current version cannot convert 256 or 512 size icons 2. Current version incorrectly decodes some icons 3. Current version segfaults on some icons
Thanks for the report, assigning to maintainers.
media-libs/libicns is in tree now. users that had icns2png installed, will noticed it as pkgmove from media-gfx/icns2png.