ImageMagick 拆分透明PNG、合并JPG和Alpha Mask

jpg&mask2png

@echo off
set exevar="D:\Program Files\ImageMagick-6.9.0-Q16\convert.exe"

for /f "usebackq tokens=*" %%d in (`dir /s /b *.jpg`) do (
    %exevar% "%%d" "%%~dpnd_alpha_mask.png" -compose copyopacity -composite "%%~dpnd_with_alpha.png"
)

png2jpg&mask

@echo off
set exevar="D:\Program Files\ImageMagick-6.9.0-Q16\convert.exe"

for /f "usebackq tokens=*" %%d in (`dir /s /b *.png`) do (
    %exevar% "%%d" -background black -alpha remove "%%~dpnd.jpg"
    %exevar% "%%d" -alpha extract "%%~dpnd_alpha_mask.png"
)