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ImageMagickのconvertコマンドのオプション
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convert_option.md

基本

convert INPUT OUTPUT

リサイズ

convert -resize 150x150 INPUT OUTPUT

PNG

色数を指定

convert -colors 256 input.png output.png

typeオプションでカラーパレットを選ぶ

# Platteを使用
convert -type Palette input.png output.png
# グレースケール
convert -type GrayScale input.png output.png

圧縮率を指定

qualityを使用 十の位が圧縮率、一のくらいが圧縮方式

convert -quality 12  input.png output.png

圧縮方式はこちら http://web.njit.edu/all_topics/Prog_Lang_Docs/html/imagemagick/www/command-line-options.html#quality

WebP

convert -define webp:lossless=true INPUT OUTPUT.webp

画質を指定

qualityを使用

convert -quality 91 -define webp:lossless=true INPUT OUTPUT.webp

色数を指定

colorsを使用

convert -colors 170 -define webp:lossless=true INPUT OUTPUT.webp
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