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update readme

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commit 575f20328d2cbc0984f0a615bf4bd5d7c5fffa10 1 parent 3f4f93f
Konstantin Käfer authored
Showing with 2 additions and 1 deletion.
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@@ -13,7 +13,8 @@ The files in the `src/` directory are the unpacked contents of the [`advancecomp
### Usage
-This fork of the [AdvanceCOMP][] tools does not modify any of the original tools, but adds an additional tool– `advpngidat`.
+This fork of the [AdvanceCOMP][] tools adds support for reading files from standard input
+and writing the recompressed result to standard output. It also adds an additional tool– `advpngidat`.
The `advpngidat` tool has a couple of options, which you can view via `--help`, but there is really only one option that is used in practice: `-z4`. This specifies that the original `.png` file should be recompressed using the highest compression / maximum effort setting. For example:
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