etc1tool

etc1tool is a command line utility that lets you encode PNG images to the ETC1 compression standard and decode ETC1 compressed images back to PNG.

The usage for etc1tool is:

  1. etc1tool infile [--help | --encode | --encodeNoHeader | --decode] [--showDifference
  2. diff-file] [-o outfile]
OptionDescription
infileThe input file to compress
—helpPrint usage information
—encodeCreate an ETC1 file from a PNG file. This is the default mode for the tool if nothing is specified.
—encodeNoHeaderCreate a raw ETC1 data file (without a header) from a PNG file.
—decodeCreate a PNG file from an ETC1 file
—showDifference diff-fileWrite the difference between the original and encoded image to diff-file (only valid when encoding).
-o outfileSpecify the name of the output file. If outfile is not specified, the output file is constructed from the input filename with the appropriate suffix (.pkm or .png).