[Bulk Image Processing] Shell script that saves original, resizes, and compresses images.

bulk-image-processing.sh

#!/bin/sh

# Go to the root of images folder
# Run for each type of image, for example, PNG: 
# $ find . -type f -name '*.png' -exec ~/path/to/script/bulk-image-processing.sh {} \; 2>&1 | tee log-png.txt;

file="${1}"
basename=${file%.*}
extension="${file##*.}"
copiedFile="$basename"_"ORIGINAL.$extension"

#using sips to retrieve the width
width=($(sips -g pixelWidth "${1}" | grep pixelWidth | grep -Eo "\d+"))

#Get file size
bytes=$(stat -f%z "${1}")
extension="${1##*.}"

#the width limit you want
widthLimit=2500

#500 kb
byteLimit=512000
minByteLimit=102400

#quality
minQuality=65
maxQuality=85

#Print out filesize
echo ${file}

if [[ $bytes -lt 1024 ]]; then
    echo "Filesize: ${bytes}B"
elif [[ $bytes -lt 1048576 ]]; then
    echo "Filesize: $(( (bytes + 1023)/1024 ))KiB"
else
    echo "Filesize: $(( (bytes + 1048575)/1048576 ))MiB"
fi

#Print out width
echo "Width: ${width[0]}px"

# Copy file before resizing/compressing. Skip files less than 100kb.
if [[ $bytes -gt $minByteLimit ]]; then
    cp "${file}" "${copiedFile}"
    echo "COPY SUCCESS - copied original, created ${copiedFile}"

    # Resize large images based on width
    if [[ ${width[0]} -gt $widthLimit && $bytes -gt $byteLimit ]]; then
        if [[ $bytes -gt $byteLimit ]]; then
            sips -Z $widthLimit "${1}"
            echo "RESIZE SUCCESS - Resized from ${width[0]}px to ${widthLimit}px wide."
        else
            echo "Resize Skipped - Did not resize dimensions, filesize OK."
        fi
    else
        echo "Resize Skipped - Did not resize dimensions, within limits."
    fi

    echo "Compressing image to ${maxQuality}%..."

    # Compress images based on type
    if [ "$extension" == "png" ]; then
        pngquant --quality=${minQuality}-${maxQuality}% --skip-if-larger "${1}" --output "${1}" --force
    elif [ "$extension" == "jpg" ]; then
        mogrify -strip -interlace Plane -quality ${maxQuality}% "${1}"
    fi

    if [ $? -eq 0 ]; then
        echo "COMPRESSION SUCCESS"
    fi
else
    echo "Compression Skipped - file under 100kb"
fi

echo " --- "