Re: Dot Gain
Re: Dot Gain
- Subject: Re: Dot Gain
- From: "Bruce J. Lindbloom" <email@hidden>
- Date: Tue, 29 Apr 2003 13:46:16 -0500
Roger Breton wrote:
>
In the end, I think we all suffer from a "dot gain phobia", meaning we don't
>
want any dot gain or when there is, we would like t to be different or
>
smaller or larger, because we're so accustomed to se it one way or another.
We should understand that dot gain is good, not bad. If the dot gain of a
printing system was zero, then the CMYK values would represent reflectance,
which is the CMYK equivalent of a gamma = 1.0 RGB system. At 8-bits per
channel, this is not suitable for avoiding visual quantization
(posterization) defects.
We know that an RGB working space having gamma = 2.2 is more visually
uniform than one with gamma = 1.0. Similarly, some amount of dot gain (20 to
30%) redistributes the CMYK tone scales in a more visually uniform way.
This is good fortune because the gamma 2.2 that is part of the physics of a
video display system, and the 20+% dot gain that falls out of an offset
printing system, both help distribute tones more evenly visually and both
came about by "accident" (i.e. they were not specifically designed in for
that purpose).
--
Bruce J. Lindbloom
email@hidden
http://www.brucelindbloom.com
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