[argyllcms] More questions about gamma
- From: Leonard Evens <len@xxxxxxxxxxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Sat, 28 Feb 2009 14:02:18 -0600
Suppose I have an digital file containing a series of gray scale images of
squares each with a know value in the in the range 0..255. I can in
principle measure the values of the images on my monitor using my
Eye-One-Pro and argyll. I can then plot the results as a graph.
If I understand what is going on properly---which may be far from the
truth---the resulting graph should theoretically be that of a power
function y = x^g, where g would be gamma. But, in point of fact,the graph
will only be approximately that of a power function, and the approximation
may not be all that close. (Even in the best case, there may be
various corrections added to the graph to allow for a realistic result.)
I assume that the process of calibration/profiling---ignoring color
for the moment---is aimed at producing such a transfer function.
First question: Is this more or less right?
Second question: Is there some way to use argyll commands and the
data files it produces to produce the graph of the transfer function
being aimed at and/or the one actually produced, without going through
the process of making the measurements manually?
--
Leonard Evens <len@xxxxxxxxxxxxxxxxxxxxx>
Mathematics Department, Northwestern University
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