Buying the full version of Photoshop may be a little out of a beginning developer's budget, but fear not...
Photoshop Express, a tool mentioned briefly in the April 10th Meetup with Savvy Panda, is an online editor that will take care of your basic cropping, color, tint, hue, saturation and brightness adjustments through a handy online browser-based interface.
All you have to do is upload the picture and start editing!
Watch the video (no sound)
Next, upload your photo
And get down to work!