These tiny tools will save you time if you want to resize, watermark, change format or convert to black and white a bunch of pictures.
If you want these scripts to be installed as proper exec files, use the install.sh script. The commands will then be $ it-resize $ it-grayscale $ it-convert and $ it-watermark.
For convert.sh, parameters are :
$ ./convert.sh DIR FORMATwith DIR optional (default : ./) and FORMAT : output format.