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Re: LStar


In a message dated 5/17/05 10:07:26 PM, email@hidden writes:


LStar is not really a gamma but a gray scale constructed so that each step
VISUALLY appears to be an even increase in brightness from the step before
it. This is why it is sometimes referred to as the "Equal brightness" scale.

Right, but if you plot it against a gamma curve in the 2.3 - 2.4 range, the differences will be relatively small. So the oft repeated marketing statement that "L* is not a curve" should really be worded, for educational purposes, that "L* is not a simple curve that can be defined by a single number... but is relatively close to such a curve".

C. David Tobie
Product Technology Manager
ColorVision Inc.
email@hidden
www.colorvision.com 
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