A bash script to watermark all the images in a folder (ubuntu, imagemagick, svg)

by Alessino • 13 gennaio 2012 • tutorial • 0 Comments

Hello, this time something a bit “nerdy”, i need a script to watermark a batch of images, prior to upload them on Flickr, but all the scripts i’ve found, using ImageMagick, uses a fixed width image and watermark.

My idea is to automatically resize the watermark to about 50% the width of the image and the apply it.

This simple script just browse all the files in a folder, with a specific extension (ie *.jpeg, *.JPG, etc) and first read the width of the image, then resize the watermark to the correct size (50%) and then apply it, saving the new image with the same name but in a subfolder.

Please note, to work this scripts needs that you’ve installed ImageMagick and optionally Zenity and was tested with Ubuntu 11.04.

#Address of the watermark file
WATERMARK="url_to_your_watermark_file.svg"
# Check if the directory "watermarked" exists or create it.
if [ ! -e "watermarked" ]
then
mkdir watermarked
fi
#loop inside all the images in folder
for image in *.jpg *.JPG *.jpeg *.JPEG *.png *.PNG
do
if [ ! -e "$image" ] # Check if file exists.
then
continue
fi
#Retrieve size of the image and divide the lenght by 2
size=`identify -format %[fx:w/2] $image`
#Apply the watermark and create a new image in the "watermarked" subfolder
composite -gravity southeast -background none \( $WATERMARK -geometry ${size} \) ${image} watermarked/${image}
done
#If you have installed zenity, a message will popup when the process is complete
zenity --info --title "Ultramini Watermarker!" --text "Process Complete!"

#Address of the watermark file

WATERMARK="url_to_your_watermark_file.svg"

# Check if the directory "watermarked" exists or create it.

if [ ! -e "watermarked" ]

then

mkdir watermarked

#loop inside all the images in folder

for image in *.jpg *.JPG *.jpeg *.JPEG *.png *.PNG

if [ ! -e "$image" ] # Check if file exists.

then

continue

#Retrieve size of the image and divide the lenght by 2

size=`identify -format %[fx:w/2] $image`

#Apply the watermark and create a new image in the "watermarked" subfolder

composite -gravity southeast -background none $ $WATERMARK -geometry ${size} $ ${image} watermarked/${image}

done

#If you have installed zenity, a message will popup when the process is complete

zenity --info --title "Ultramini Watermarker!" --text "Process Complete!"

If you put this script in your home_folder/.gnome2/nautilus_scripts then you can access it just right-clicking inside the folder with your images and choosing the script in the “scripts” menu