PNG chunk analyzer and modifier
$ gcc -o ./umbrielpng umbrielpng.c -lz
$ ./umbrielpng --help
Usage: ./umbrielpng [-v | --verbose] [options] [--] <png...>
Options:
--fix-in-place | -o <output> | --o=<output>
Fix the PNG file. --fix-in-place works in place, otherwise use the provided output.
--cicp-prim=<primaries>
--cicp-trc=<transfer>
Tag the output file with a cICP chunk with the provided primaries and transfer.