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# 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]

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`).

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