Created
January 12, 2020 06:28
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Script to replace white image backgrounds with transparency
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| #!/bin/bash | |
| # Converts white backgrounds to transparent. | |
| # Pass the image path and threshold percentage | |
| # example: | |
| # ./background-remove.sh catpic.jpg 20% | |
| IMGPATH=$1 | |
| THRESHOLD=$2 | |
| # start real | |
| convert ${IMGPATH} \( +clone -fx 'p{0,0}' \) -compose Difference -composite -modulate 100,0 +matte ${IMGPATH}_difference.png | |
| # remove the black, replace with transparency | |
| convert ${IMGPATH}_difference.png -bordercolor white -border 1x1 -matte -fill none -fuzz 7% -draw 'alpha 1,1 floodfill' -shave 1x1 ${IMGPATH}_removed_black.png | |
| composite -compose Dst_Over -tile pattern:checkerboard ${IMGPATH}_removed_black.png ${IMGPATH}_removed_black_check.png | |
| # create the matte | |
| convert ${IMGPATH}_removed_black.png -channel matte -separate +matte ${IMGPATH}_matte.png | |
| # negate the colors | |
| convert ${IMGPATH}_matte.png -negate -blur 0x1 ${IMGPATH}_matte-negated.png | |
| # eroding matte(to remove remaining white border pixels from clipped foreground) | |
| convert ${IMGPATH}_matte.png -morphology Erode Diamond ${IMGPATH}_erode_matte.png | |
| # you are going for: white interior, black exterior | |
| composite -compose CopyOpacity ${IMGPATH}_erode_matte.png ${IMGPATH} ${IMGPATH}_finished.png | |
| #remove white border pixels | |
| convert ${IMGPATH}_finished.png -bordercolor white -border 1x1 -matte -fill none -fuzz ${THRESHOLD}% -draw 'alpha 1,1 floodfill' -shave 1x1 ${IMGPATH}_final.png | |
| #deleting extra files | |
| rm ${IMGPATH}_difference.png | |
| rm ${IMGPATH}_removed_black.png | |
| rm ${IMGPATH}_removed_black_check.png | |
| rm ${IMGPATH}_matte.png | |
| rm ${IMGPATH}_matte-negated.png | |
| rm ${IMGPATH}_erode_matte.png | |
| rm ${IMGPATH}_finished.png |
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