mirror of
https://github.com/elkowar/dots-of-war.git
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86 lines
1.9 KiB
Bash
86 lines
1.9 KiB
Bash
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#!/bin/sh
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calc_percentage() {
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echo "$(($(("$1" / 100)) * "$2"))"
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}
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help() {
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cat << EOT
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Usage: resizeGif.sh <input-file> [OPTIONS]
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you can provide --percentage or --coarse-in to decide how to resize the gif
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Options:
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-p --percentage <number> size percentage to resize the image to
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-c --coarse-in <x_res>x<y_res> maximum resolution to box the output image in
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-o --out <filename> name of the output file
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EOT
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}
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if [ -z "$1" ]; then
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help
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exit 1
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fi
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IN_FILE="$1"
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shift
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while [ -n "$1" ]; do
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case "$1" in
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-p|--percentage)
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shift
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PERCENTAGE="$1"
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;;
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-c|--coarse-in)
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shift
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COARSE_IN="$1"
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;;
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-o|--out)
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shift
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OUT_FILE="$1"
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;;
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esac
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shift
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done
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[ -n "$PERCENTAGE" ] && [ -n "$COARSE_IN" ] && {
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echo "You may only provide percentage OR coarse-in"
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exit 1
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}
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base_resolution=$(identify "$IN_FILE" | awk 'NR==1{print $3}')
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x_res="$(echo "$base_resolution" | sed 's/\(.*\)x\(.*\)/\1/g')"
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y_res="$(echo "$base_resolution" | sed 's/\(.*\)x\(.*\)/\2/g')"
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if [ -n "$PERCENTAGE" ]; then
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x_scaled="$(calc_percentage "$x_res" "$PERCENTAGE")"
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y_scaled="$(calc_percentage "$y_res" "$PERCENTAGE")"
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elif [ -n "$COARSE_IN" ]; then
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arg_x="$(echo "$COARSE_IN" | sed 's/\(.*\)x\(.*\)/\1/g')"
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arg_y="$(echo "$COARSE_IN" | sed 's/\(.*\)x\(.*\)/\2/g')"
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x_fact="$(( $((arg_x * 100)) / x_res))"
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y_fact="$(( $((arg_y * 100)) / y_res))"
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if [ "$x_fact" -lt "$y_fact" ]; then
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lower_fact="$x_fact"
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else
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lower_fact="$y_fact"
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fi
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x_scaled="$(calc_percentage "$x_res" "$lower_fact")"
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y_scaled="$(calc_percentage "$y_res" "$lower_fact")"
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else
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echo "You need to give --percentage or --coarse-in."
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exit 1
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fi
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if [ -z "$OUT_FILE" ]; then
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OUT_FILE="smaller_${IN_FILE}"
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fi
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echo "resizing to ${x_scaled}x${y_scaled}"
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convert "$IN_FILE" -coalesce -resize "${x_scaled}x${y_scaled}" -fuzz 2% +dither -layers Optimize +map "$OUT_FILE"
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