pngtools

series of tools for PNG (Portable Network Graphics) images
  https://www.madebymikal.com/category/pngtools/
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Pngtools is a suite of utilities to work with PNG (Portable Network Graphics) files, equivalents to libtiff's tiffinfo, and tiffcp commands. These commands are called pnginfo, pngcp. tiffdump is replaced by pngchunks and pngchunkdesc as well.