CameraTrax 24ColorCard-3x5 (OneSnapColor) with White Balance and User Guidebook Precision NIST traceable color, RGB values and sub-pixel print resolution for superior digital color correction FlipCard with laminated cover & magnetic latch includes both 24-Color and White Balance references Rigid construction, archival quality acid-free materials and better than 99% stable matte-finish measured reference colors Detailed 32-page full-color User's Guide includes instructions for Picasa 3.8, Photoshop Lightroom 3, Photoshop Elements 9.0 and Photoshop CS4 Easy 3 step process makes improving your digital photo color simple.