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IMAGEMAGICK

Imagemagick is a collection of small programs used for manipulating images in multiple formats. The way I use it is from the command line to process multiple files with a single command and many parameters. Used for resizing images, rotating, changing brightness, extracting sub‑images, creating mosaics, converting formats... It is impossible to remember all the options. I save my scripts in text files and reuse them for new tasks. One of the most important sub‑programs is Mogrify. Use it on a Linux console or on a Cygwin console on Windows.

Imagemagick scripts:

Resizing images

mogrify -resize 50% *.jpg
mogrify -resize 900 *.png

Changing image format

mogrify -format jpg *.png

Creating image mosaics

Montage with names:
montage -label %t * show -pointsize 20 -tile 2x3 -geometry 800x700+10+10 out.jpg
montage -label "%t" -pointsize 24 *.jpg -tile 4x4 -geometry 648x486+5+5 CP.jpg
Convert to A3 paper:
convert -quality 100% out.jpg -rotate -90 -page A3 out2.pdf

Renaming (bash) and creating image mosaics

#!/bin/bash
i=1
for file in *.JPG
do
i=$((i+1))
mv "$file" "$i.JPG"
done

# Imagemagick
montage -label "%t" *.JPG -tle 3x3 -geometry 512x384+30+30 Reportatge.pdf

Crop a list of images

#! /bin/bash
# Crop photo in 6 parts
# pere 2015-05-27

mkdir new

ls -1 | grep ".jpg" > list.txt

for foto in $(less list.txt); do

convert $foto -crop 320x320+65+65 new/$foto-11.jpg;
convert $foto -crop 320x320+385+65 new/$foto-12.jpg;
convert $foto -crop 320x320+65+385 new/$foto-21.jpg;
convert $foto -crop 320x320+385+385 new/$foto-22.jpg;
convert $foto -crop 320x320+65+705 new/$foto-31.jpg;
convert $foto -crop 320x320+385+705 new/$foto-32.jpg;

done

Rotate images 90 degrees

# Rotate 90 degrees left all images
# in the same directory
# 2015-12-06

#!/bin/bash
for file in *.jpg; do
  convert -rotate -90 "$file" "$file"
done

Easier:
mogrify -rotate 90 image_name.jpg