In This tutorial we will will learn how to prepare line art for scanning into our Digital Painting projects, we will learn some Tips for Scanning, Adjusting Contrast/Levels, Extracting Line work and Creating a handy action.
The Levels command, and its cohort, the Histogram, let you adjust luminance levels on a channel-by-channel basis. The upshot is that you can increase contrast, correct for color cast, and make a bad image good.