Re: Dot Gain
Re: Dot Gain
- Subject: Re: Dot Gain
- From: "Bruce J. Lindbloom" <email@hidden>
- Date: Tue, 29 Apr 2003 13:15:50 -0500
MSD wrote:
>
The results seem to be -
>
A 30% dot gain does not "grow" a dot by 30%.
>
-
>
My 3% dot does not end up at 33%.
>
Anything over 70% does not end up solid.
When a single dot gain value is given, it refers to the dot gain at the 50%
dot. If you measure the dot gain across a full tone scale (0% to 100%) you
will find that the dot gain peaks in the neighborhood of 50% and is smaller
as you go away from that point towards either 0% or 100%. In fact, dot gain
is always exactly zero at 0% and 100%, according to the definition of dot
gain (at least according to the Murray-Davies definition).
A dot gain value of 30% does indeed mean that the 50% dot has grown to 80%.
But it does not mean that a 3% dot has grown to 33%. It says nothing at all
about a 3% dot.
I have a dot gain calculator spreadsheet which computes dot gain at 5%
increments across the scale and produces a graph, so you can see the rise of
dot gain as you move towards 50% and the fall thereafter. This spreadsheet
comes with the FOGRA IT8.7/3 data "pre-loaded" so you can see the shape of a
typical, real-world curve by just opening the spreadsheet (before you put in
your own measurements). It is called "LabDotGainCalculator2.xls" and may be
found here <
http://www.brucelindbloom.com/DotGainLab.html>.
--
Bruce J. Lindbloom
email@hidden
http://www.brucelindbloom.com
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