Color Scanners--The Color of Digital Originals
In order to establish a benchmark for great color in the scanning environment, it is important to understand the common problems, and causes, associated with poor scanning applications.
Three paramount challenges come to mind: poor tonal range in originals, poor RGB to CMYK color conversion and inadequate sharpening.
While poor tonal range in originals (most likely caused by underexposure, overexposure or even color casts resulting from poor film development) and inadequate sharpening (a negative side effect of halftone printing) are critical, for purposes of this article, let's concentrate on the RGB to CMYK challenge.
Assuming that the user has a good RGB file, the next issue is the conversion of RGB to CMYK. There are many options for RGB to CMYK conversions, but the issue is quality. The RGB color gamut is much broader than the CMYK color space, so the challenge is to create a CMYK combination that can closely reproduce a printed image that looks natural to the human eye.
At UMAX, PhotoPerfect uses binu-scan's Exact Color technology, which produces a digital separation that matches the quality of traditional printing separations. Exact Color allows consistent color separations to be generated, regardless of the table used or total ink coverage required.