Initial

tools/image_optim.sh

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+#!/bin/bash
+# Convert images from .png to .jpg + reduce resolution + shrink filesize.
+MAX_SIZE=128
+BATCH_SIZE=50
+tmp=()
+
+cd "$(dirname "$0")" || exit
+
+
+imageOptim() {
+    open --new --wait-apps --background -b net.pornel.ImageOptim --args "$@"
+}
+
+optimize() {
+    if [ "${#tmp[@]}" -ge "$1" ]; then
+        echo "imageOptim on ${#tmp[@]} files"
+        imageOptim "${tmp[@]}"
+        tmp=()
+    fi
+}
+
+downscale() {
+    IN_FILE=$1
+    OUT_FILE=${IN_FILE%.png}.jpg
+    w=$(sips -g pixelWidth "$IN_FILE" |  cut -d: -f2 | tail -1)
+    if [ "$w" -gt $MAX_SIZE ]; then w=$MAX_SIZE; fi
+    sips -Z "$w" "$IN_FILE" -s format jpeg -o "$OUT_FILE" 1> /dev/null
+    tmp+=("$PWD/$OUT_FILE")
+    optimize $BATCH_SIZE
+}
+
+# using glob is fine because filenames do not contain spaces
+total=$(echo ../data/*/*.png | wc -w)
+total=${total##* }
+if [ "$total" -lt 2 ]; then
+    if [ "$(echo ../data/*/*.png)" = '../data/*/*.png' ]; then
+        echo "Nothing to do."
+        exit 0;
+    fi
+fi
+
+i=0
+for file in ../data/*/*.png; do
+    i=$((i+1))
+    echo "[$i/$total] sips $file"
+    downscale "$file"
+    if [ -f "${file%.png}.jpg" ]; then
+        rm "$file"
+    fi
+done
+
+optimize 1