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:

etc1tool infile [--help | --encode | --encodeNoHeader | --decode] [--showDifference
diff-file] [-o outfile]

This table lists the command options:

Option	Description
`infile`	The input file to compress.
`--help`	Print usage information.
`--encode`	Create an ETC1 file from a PNG file. This is the default mode for the tool if nothing is specified.
`--encodeNoHeader`	Create a raw ETC1 data file without a header from a PNG file.
`--decode`	Create a PNG file from an ETC1 file.
`--showDifference diff-file`	Write the difference between the original and encoded image to `diff-file`. This option is only valid when encoding.
`-o outfile`	Specify 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`).