A bash script to replace the background with a single colour and resize the image to square.
Uses background remover and ImageMagick.
Last active
January 28, 2022 12:37
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Remove arbitrary background, resize to square, and add a single-colour background for images in `./input` directory.
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| #!/bin/bash | |
| remove_background() { | |
| echo "[$2] remove background:" | |
| file=$2 | |
| input="$1/$file" | |
| output="./output/$file.png" | |
| # https://github.com/nadermx/backgroundremover | |
| backgroundremover -i "$input" -o "$output" | |
| } | |
| generate_alpha() { | |
| echo "[$1] fix alpha:" | |
| file=$1 | |
| output="./output/$file.png" | |
| alpha="./alpha/$file.png" | |
| convert "$output" -alpha extract "$alpha" | |
| convert "$alpha" \ | |
| -define connected-components:mean-color=true \ | |
| -define connected-components:area-threshold=30 \ | |
| -connected-components 4 "$alpha" | |
| } | |
| apply_alpha() { | |
| echo "[$2] apply alpha:" | |
| file=$2 | |
| input="$1/$file" | |
| output="./output/$file.png" | |
| alpha="./alpha/$file.png" | |
| convert "$input" "$alpha" -alpha off -compose copy_opacity -composite "$output" | |
| } | |
| copy_transparent() { | |
| echo "[$1] copy transparent" | |
| file=$1 | |
| output="./output/$file.png" | |
| transparent="./transparent/$file.png" | |
| cp $output $transparent | |
| } | |
| make_square() { | |
| echo "[$1] make square:" | |
| file=$1 | |
| input="./output/$file.png" | |
| output=$input | |
| width=`identify -format "%w" "$input"` | |
| height=`identify -format "%h" "$input"` | |
| size=$(($width>$height ? $width : $height)) | |
| convert "$input" -trim -resize ${size}x${size} -background Transparent \ | |
| -gravity center -extent ${size}x${size} "$output" | |
| } | |
| make_color_variant() { | |
| echo "[$1] make color variant: $3" | |
| file=$1 | |
| color=$2 | |
| colorname=$3 | |
| input="./output/$file.png" | |
| output="./$colorname/$file.png" | |
| convert "$input" -background $color -alpha remove -alpha off "$output" | |
| } | |
| dir="./$1" | |
| if [ -z "$1" ]; then | |
| dir="./input" | |
| fi | |
| files=`ls "$dir"` | |
| #colors="magenta=Magenta black=Black white=White cyan=Cyan yellow=Yellow brand=#64B7D6" | |
| colors="magenta=Magenta white=White brand=#64B7D6" | |
| mkdir -p "./output" | |
| mkdir -p "./alpha" | |
| mkdir -p "./transparent" | |
| for item in $colors | |
| do | |
| name=`echo $item | sed -e 's/=.*//g'` | |
| mkdir -p "./$name" | |
| done | |
| for f in $files | |
| do | |
| mogrify -auto-orient "./$dir/$f" | |
| if [ ! -f "./alpha/$f.png" ]; then | |
| remove_background "$dir" "$f" | |
| generate_alpha "$f" | |
| fi | |
| apply_alpha "$dir" "$f" | |
| copy_transparent "$f" | |
| make_square "$f" | |
| for item in $colors | |
| do | |
| name=`echo $item | sed -e 's/=.*//g'` | |
| color=`echo $item | sed -e 's/.*=//g'` | |
| make_color_variant "$f" "$color" "$name" | |
| done | |
| done | |
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