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@syoyo(Syoyo Fujita)

ImageMagick で channel ごとの画像を指定して RGBA 画像を生成するメモ

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背景

RGB 画像の特定の channel を入れ替えたい.

glTF で metallicGlossness texture を作りたい. B channel に metalness, G channel に glossiness を指定する必要がある.

ImageMagick

-channel, -combine あたりを使う.

元データが grayscale の場合

$ convert metalness.png glossiness.png -background black -channel GB -combine metallicRoughness.png

として, G に metalness.png, B に glosiness.png の RGBA 画像が生成できる.

TODO

  • RGB(A) 画像の G channel を A に差し替えなど. -channel-fx を使うといけるか?
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