ColorLab offers a range of enhancement tools.  The metaphor of the photographic lab is carried through with great consistency.  There are two pull-down menus that govern the processing:  "Process" gives access to the "setup processing" command -- this governs palette selection (color, grey-scale and monochrome), and it is a matter of clicking a screen button to adjust these settings.  The "enhance" menu offers controls for brightness and contrast, color adjustment (RGB), color balance and gamma (color tone) settings.  These are controlled by screen sliders.  The color balance tool is particularly easy to use:  Tap the meter button, and move the crosshair to a section of the picture that is a neutral shade (white or grey seems best); hit the "ok" button and the color is adjusted to that setting.

Unlike Picture Publisher Plus, ColorLab does not offer a built-in paint capability for image touchup.  At first this seemed a liability.  Touchups involved saving the program in a format readable by one of the standard paint programs, opening paint, saving the touched-up image, then further processing it -- at least to a different format.  But as it turns out, the paint facility in Picture Publisher is no joy to use, and it is just about as complex a process to activate it (in part, it seems Picture Publisher  suspends Windows and shifts to DOS for the paint operation).  Coupled with somewhat greater complexity in installation, Picture Publisher just doesn't seem as elegant a solution.