pngquant – mg-comp.

Command-line:comprese PNGs.

donwload
http://pkgs.org/search/pngquant

wget 'http://dl.fedoraproject.org/pub/epel/6/x86_64/pngquant-2.4.1-1.el6.x86_64.rpm'
rpm -iv pngquant-2.4.1-1.el6.x86_64.rpm

エラー: 依存性の欠如:
        libimagequant.so.0()(64bit) は pngquant-2.4.1-1.el6.x86_64 に必要とされています
        liblcms2.so.2()(64bit) は pngquant-2.4.1-1.el6.x86_64 に必要とされています

エラー: 依存性の欠如:

libimagequant.so.0()(64bit) は pngquant-2.4.1-1.el6.x86_64 に必要とされています

liblcms2.so.2()(64bit) は pngquant-2.4.1-1.el6.x86_64 に必要とされています

Requires
libc.so.6(GLIBC_2.4)(64bit)
libimagequant.so.0()(64bit)
liblcms2.so.2()(64bit)
libm.so.6()(64bit)
libpng12.so.0()(64bit)
libpng12.so.0(PNG12_0)(64bit)
libpng(x86-64) >= 1.2.46-1
libz.so.1()(64bit)
rtld(GNU_HASH)
zlib >= 1.2.3-1

不足分のダウンロード
wget 'http://dl.fedoraproject.org/pub/epel/6/x86_64/libimagequant-2.4.1-1.el6.x86_64.rpm'
wget 'http://pkgrepo.linuxtech.net/el6/release/x86_64/liblcms2-2.4-1.el6.x86_64.rpm'

不足分を適用
rpm -iv liblcms2-2.4-1.el6.x86_64.rpm
rpm -iv libimagequant-2.4.1-1.el6.x86_64.rpm

再インストール
rpm -iv pngquant-2.4.1-1.el6.x86_64.rpm

インストール確認
pngquant --help

pngquant, 2.4.1 (April 2015), by Greg Roelofs, Kornel Lesinski.
   DEBUG (slow) version.
   Compiled with SSE instructions.
   Using libpng 1.2.49 with Little CMS color profile support.

WARNING: Your version of libpng is outdated and may produce corrupted files.
Please recompile pngquant with the current version of libpng (1.6 or later).

usage:  pngquant [options] [ncolors] -- pngfile [pngfile ...]
        pngquant [options] [ncolors] - >stdout <stdin

options:
  --force           overwrite existing output files (synonym: -f)
  --skip-if-larger  only save converted files if they're smaller than original
  --output file     output path, only if one input file is specified (synonym: -o)
  --ext new.png     set custom suffix/extension for output filenames
  --quality min-max don't save below min, use fewer colors below max (0-100)
  --speed N         speed/quality trade-off. 1=slow, 3=default, 11=fast & rough
  --nofs            disable Floyd-Steinberg dithering
  --posterize N     output lower resolution color (e.g. for ARGB4444 output)
  --verbose         print status messages (synonym: -v)

Quantizes one or more 32-bit RGBA PNGs to 8-bit (or smaller) RGBA-palette
PNGs using Floyd-Steinberg diffusion dithering (unless disabled).
The output filename is the same as the input name except that
it ends in "-fs8.png", "-or8.png" or your custom extension (unless the
input is stdin, in which case the quantized image will go to stdout).
The default behavior if the output file exists is to skip the conversion;
use --force to overwrite. See man page for full list of options.

pngquant, 2.4.1 (April 2015), by Greg Roelofs, Kornel Lesinski.

DEBUG (slow) version.

Compiled with SSE instructions.

Using libpng 1.2.49 with Little CMS color profile support.

WARNING: Your version of libpng is outdated and may produce corrupted files.

Please recompile pngquant with the current version of libpng (1.6 or later).

usage: pngquant [options] [ncolors] -- pngfile [pngfile ...]

pngquant [options] [ncolors] - >stdout <stdin

options:

--force overwrite existing output files (synonym: -f)

--skip-if-larger only save converted files if they're smaller than original

--output file output path, only if one input file is specified (synonym: -o)

--ext new.png set custom suffix/extension for output filenames

--quality min-max don't save below min, use fewer colors below max (0-100)

--speed N speed/quality trade-off. 1=slow, 3=default, 11=fast & rough

--nofs disable Floyd-Steinberg dithering

--posterize N output lower resolution color (e.g. for ARGB4444 output)

--verbose print status messages (synonym: -v)

Quantizes one or more 32-bit RGBA PNGs to 8-bit (or smaller) RGBA-palette

PNGs using Floyd-Steinberg diffusion dithering (unless disabled).

The output filename is the same as the input name except that

it ends in "-fs8.png", "-or8.png" or your custom extension (unless the

input is stdin, in which case the quantized image will go to stdout).

The default behavior if the output file exists is to skip the conversion;

use --force to overwrite. See man page for full list of options.

実行例

アウトプットファイル名指定
pngquant 'taki_1280tate.png' -o'taki_1280tate_2.png'
7277465 taki_1280tate.png -> 2209250 taki_1280tate_2.png

拡張子の変更で変換
pngquant --ext .png1 'taki_1280tate.png'
7277465 taki_1280tate.png -> 2209250 taki_1280tate.png1

再帰的変換例
find . -name '*.png' -exec pngquant -v {} \;

Using pngquant in PHP
https://pngquant.org/php.html

Command-line:comprese PNGs.

実行例

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