watermarking images with convert
convert is a command line tool from image magick package
This is a script I use for watermarking the images:
#!/bin/sh
for i in $( ls | grep jpg); do
convert $i -font /usr/share/fonts/Plazan.ttf -pointsize 17 -draw "gravity SouthWest translate 12,-10 fill '#ECD6B1'text 1,11 'MY LOGO' " -draw "gravity SouthWest translate 0,0 image Over 0,0 0,0 '/images/logocompany.png' " $i
done
I place it inside the folder with the images the are to be marked and run it.