Picasa provides a variety of fixes and effects to you improve almost any photo or to create something totally unique. Double-click a photo to find five tabs full of tools:

Basic Fixes	Tuning
Make simple edits -- such as cropping, straightening, removing redeye, retouching blemishes, or adding text -- to your photos. Or click I'm Feeling Lucky to try Picasa's all-in-one lighting and contrast fix. Learn more about Basic Fixes	Use the sliders to adjust the color and lighting aspects of your photo to produce a more visually enhanced image. Learn more about Tuning

Effects	Picnik Effects
Choose from 12 effects to make your photos more interesting: Sharpen, convert to sepia or black and white, warm the photo, apply tint, saturate the colors, and more. Learn more about Effects	Editing tools powered by the good people at Picnik. We've built two tabs worth of Picnik effects - like Vignette, Orton-ish, Cross Process, and Comic Book - directly into the Picasa software. Learn more.

Don't worry -- Picasa always preserves your original photo. The photo edits you make are only viewable in Picasa until you decide to save your changes. Even then, Picasa creates a new version of the photo with your edits applied, leaving the original totally preserved.