The Color Replacement tool lets you paint over one color with a different color, and it relies on a tolerance adjustment to know which shades of that color to replace. With a little practice, you can ...

Learn how to make Terminal use a user-defined background image each time you open a new window.

Photoshop, GIMP, etc. should be on the top of your list when it comes to a professional image editing tool to do certain changes including brightness/contrast adjustment, special effects and more.