Binary package “pngtools” in ubuntu disco

series of tools for PNG (Portable Network Graphics) images

 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.