DIGITAL PROOFING -- Taking Measure of a Proof

Additionally, the illumination level in the hard copy viewing equipment must be reduced somewhat to yield an overall perceived brightness comparable to the CRT display device.

To ensure that stray light doesn't compromise the color, appearance and contrast of CRT images, a viewing environment that eliminates, or nearly eliminates, ambient light (e.g., a kiosk enclosed by an opaque curtain or walls) is necessary. It is possible that LCDs (by virtue of their significantly higher brightness) could be employed in a virtual proofing system with significantly less restriction on ambient light levels.