Photo: Debbie GrossmanOur original shot (top left) came in flat, so we added contrast (top right), then tried some effects (bottom row). Adobe Photoshop Touch, the tablet version of Photoshop that launched late last year for Android devices (and just became available for the iPad) is no replacement for the Photoshop on your computer. But it packs surprising power—supporting layers, levels, and curves—and even makes use of layer blend modes.