Software such as GIMP and Photoshop can add saturation, sharpen, or otherwise edit your images to an extend, but nothing beats a higher quality camera.
image gallery
Use Adobe Photoshop for advanced editing or just use PowerPoint (PC) or presentations (mac) for simple changes to a picture
a photohgraph is picture that is taken from a more modern format for eg camera instead of painting or drawing
The word Photograph comes from two words. Photo meaning "Light" and Graph meaning "To Write". It literally means "To write with light."