ImageMagick - how to generate images for website

README.md

how to generate images for website

In order to convert large and heavy images to light version for websites we can use ImageMagick and Parallel packages.

./convert.sh images/ output/

# OUTPUT
# /output/
# -- /large/
# -- /thumbs/

convert.sh

#!/bin/bash

INPUT_DIR=$1
OUTPUT_DIR=$2
LARGE_SIZE=1024
THUMB_SIZE="400x300"

mkdir -p $OUTPUT_DIR/large $OUTPUT_DIR/thumbs

COMMANDS=()
for i in "$OUTPUT_DIR/*.jpg"
do
    COMMANDS+=("convert -resize 1024 -density 72 -quality 85 -strip -interlace Plane  $i $OUTPUT_DIR/large/$i");
    COMMANDS+=("convert -thumbnail '$THUMB_SIZE^>' -gravity center -crop $THUMB_SIZE+0+0 +repage  $i $OUTPUT_DIR/thumbs/$i");
done

parallel -k ::: "${COMMANDS[@]}"