Manipilating files

Having problems loading the online file altering program Picnik today, I instead experimented with Adobe photoshop which I had installed on my computer already. I would recommend it as a tool for adapting image files for the web or print.
I think that it is essential to have a handle on some type of file altering technology due to the ever present concern of file size in the digital environment. Incorporating images into your pedagogy is useful in order to stimulate your students and add a richer level to content.
Here is an image I played around with, then reduced it to 75dpi resolution which is suitable for web and only takes up a small 68k in file space.