Relicense under GPL

README.md

@@ -1,4 +1,4 @@
-#pngquant 2
+# pngquant 2
 
 This is the official `pngquant` and `libimagequant`.
 
@@ -9,14 +9,14 @@ Quantized files are often 40-70% smaller than their 24/32-bit version.
 
 This utility works on Linux, Mac OS X and Windows.
 
-##Usage
+## Usage
 
 - batch conversion of multiple files: `pngquant *.png`
 - Unix-style stdin/stdout chaining: `… | pngquant - | …`
 
 To further reduce file size, try [optipng](http://optipng.sourceforge.net) or [ImageOptim](http://imageoptim.pornel.net).
 
-##Improvements since 1.0
+## Improvements since 1.0
 
 Generated files are both smaller and look much better.
 
@@ -43,55 +43,58 @@ Generated files are both smaller and look much better.
   - multicore support via OpenMP
   - quantization moved to standalone libimagequant
 
-##Options
+## Options
 
 See `pngquant -h` for full list.
 
-###`--quality min-max`
+### `--quality min-max`
 
 `min` and `max` are numbers in range 0 (worst) to 100 (perfect), similar to JPEG. pngquant will use the least amount of colors required to meet or exceed the `max` quality. If conversion results in quality below the `min` quality the image won't be saved (if outputting to stdin, 24-bit original will be output) and pngquant will exit with status code 99.
 
     pngquant --quality=65-80 image.png
 
-###`--ext new.png`
+### `--ext new.png`
 
 Set custom extension (suffix) for output filename. By default `-or8.png` or `-fs8.png` is used. If you use `--ext=.png --force` options pngquant will overwrite input files in place (use with caution).
 
-###`-o out.png` or `--output out.png`
+### `-o out.png` or `--output out.png`
 
 Writes converted file to the given path. When this option is used only single input file is allowed.
 
-###`--skip-if-larger`
+### `--skip-if-larger`
 
 Don't write converted files if the conversion isn't worth it.
 
-###`--speed N`
+### `--speed N`
 
 Speed/quality trade-off from 1 (brute-force) to 11 (fastest). The default is 3. Speed 10 has 5% lower quality, but is 8 times faster than the default. Speed 11 disables dithering and lowers compression level.
 
-###`--nofs`
+### `--nofs`
 
 Disables Floyd-Steinberg dithering.
 
-###`--floyd=0.5`
+### `--floyd=0.5`
 
 Controls level of dithering (0 = none, 1 = full).
 
-###`--posterize bits`
+### `--posterize bits`
 
 Reduce precision of the palette by number of bits. Use when the image will be displayed on low-depth screens (e.g. 16-bit displays or compressed textures in ARGB444 format).
 
-###`--version`
+### `--version`
 
 Print version information to stdout.
 
-###`-`
+### `-`
 
 Read image from stdin and send result to stdout.
 
-###`--`
+### `--`
 
 Stops processing of arguments. This allows use of file names that start with `-`. If you're using pngquant in a script, it's advisable to put this before file names:
 
     pngquant $OPTIONS -- "$FILE"
 
+## License
+
+GPL v3 or later, and additional copyright notice must be kept for older parts of the code. See [COPYRIGHT](https://github.com/pornel/pngquant/blob/master/COPYRIGHT) for details.