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]
| 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 (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). |
