to_bmp.sh

ClockSS source code (C++) ClockSS是一种屏幕保护软件

#!/bin/sh

SRC=$1

if [ -z "$SRC" ]; then
    echo "to_bmp.sh in.png [out]"
    echo "will generate out.bmp and out_mask.bmp"
    exit
fi

BASE=${SRC%%.png}

if [ ! -z "$2" ]; then
    BASE=${2%%.bmp}
fi
    
convert $SRC -background "#000000" -flatten +matte $BASE.bmp
convert $SRC -channel alpha -separate ${BASE}_imask.bmp
convert ${BASE}_imask.bmp -negate ${BASE}_mask.bmp