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#!/bin/bash |
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# Optimize images for talk slides |
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# Run in directory with images, it does the following: |
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# 1. runs zopfli on all PNGs |
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# 2. runs guetzli on all JPEGs |
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# 3. creates lossy and lossless WebP, keeps the smaller one |
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# 4. keeps the WebP if smaller than original |
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GREEN=$(tput setaf 2) |
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NORMAL=$(tput sgr0) |
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echo "${GREEN}Running Zopfli on all PNGs${NORMAL}" |
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for I in *.png; do /opt/zopfli/zopflipng --iterations=50 --splitting=3 --lossy_8bit --lossy_transparent -y $I $I; done; |
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echo "${GREEN}Running Guetzli on all JPEGs${NORMAL}" |
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for I in *.jpg; do /opt/guetzli/guetzli $I $I; done; |
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for I in *.{png,jpg}; do |
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FILE_LOSSY=${I%.*}-lossy.webp |
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FILE_LOSSLESS=${I%.*}-lossless.webp |
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echo -e "\n* ${GREEN}Converting ${I} to lossy WebP${NORMAL}" |
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/opt/webp/bin/cwebp -m 6 -mt -noalpha $I -o $FILE_LOSSY; |
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echo "* ${GREEN}Converting ${I} to lossless WebP${NORMAL}" |
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/opt/webp/bin/cwebp -m 6 -mt -noalpha -lossless $I -o $FILE_LOSSLESS; |
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SIZE_ORIG=$(wc -c <"$I") |
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SIZE_LOSSY=$(wc -c <"$FILE_LOSSY") |
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SIZE_LOSSLESS=$(wc -c <"$FILE_LOSSLESS") |
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if [[ "$SIZE_LOSSLESS" -le "$SIZE_LOSSY" ]]; then |
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echo "* ${GREEN}Lossless WebP is smaller than lossy, deleting lossy${NORMAL}" |
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BEST_WEBP=$FILE_LOSSLESS |
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rm $FILE_LOSSY |
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else |
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echo "* ${GREEN}Lossy WebP is smaller than lossless, deleting lossless${NORMAL}" |
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BEST_WEBP=$FILE_LOSSY |
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rm $FILE_LOSSLESS |
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fi |
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SIZE_WEBP=$(wc -c <"$BEST_WEBP") |
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if [[ "$SIZE_ORIG" -le "$SIZE_WEBP" ]]; then |
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echo "* ${GREEN}Original ${I} is smaller than WebP, deleting WebP${NORMAL}" |
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rm $BEST_WEBP |
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else |
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echo "* ${GREEN}WebP is smaller than the original, keeping both WebP and the original${NORMAL}" |
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mv $BEST_WEBP ${I%.*}.webp |
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fi |
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done; |
spaze created this gist