From 22f703cab05b7cd368f4de9e03991b7664dc5022 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?J=C3=B6rg=20Frings-F=C3=BCrst?= Date: Mon, 1 Sep 2014 13:56:46 +0200 Subject: Initial import of argyll version 1.5.1-8 --- doc/calvschar.html | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 doc/calvschar.html (limited to 'doc/calvschar.html') diff --git a/doc/calvschar.html b/doc/calvschar.html new file mode 100644 index 0000000..f194d79 --- /dev/null +++ b/doc/calvschar.html @@ -0,0 +1,62 @@ + + + + Calibration vs. Characterization + + + +

Calibration +vs. + + Characterization
+

+ Some of the terminology can be confusing. Many people are initially + confused about the difference between Calibration and Characterization.
+

What is Calibration ?

+ "Calibration" is a short hand Graphic Arts term for adjusting a + devices behavior to meet calibration targets.
+ Calibration is the process of modifying the color behavior of a + device. This is typically done using two mechanisms:
+     1) Changing controls or internal settings that it + has.
+     2) Applying curves to its color channels.
+
+ The idea of calibration is to put a device is a defined state with + regard to its color response. Often this is used as a day to day + means of maintaining reproducible behavior. Calibration is often the + most practical way of setting parameters such as white point and + brightness of displays. Typically calibration will be stored in + device or systems specific file formats that record the device + settings and/or per channel calibration curves.
+

What is Characterization ?

+ Characterization (or profiling) + is recording the + way a device reproduces or responds to color. Typically the result + is stored in a device ICC + profile. Such a profile does not in itself modify color in any way. + What it does is allow a system such as a CMM (Color Management + Module) or color aware application to modify color when combined + with another device profile. Only by knowing the characteristics of + two devices or colorspaces, can a way of transferring color from one + device representation to another be achieved.
+
+ Note that a characterization (profile) will only be valid for a + device if it is in the same state of calibration as it was when it + was characterized.
+

What about display calibration and profiles ?

+ In the case of display profiles there is some additional confusion + because often the calibration + information is stored in the profile + for convenience. By convention it is stored in a tag called the + 'vcgt' tag. Although it is stored in the profile, none of the normal + ICC based tools or + applications are aware of it, or do anything with it, it is just + "along for the ride". Similarly, typical display calibration tools + and applications will not be aware of, or do anything with the ICC + characterization (profile) information.
+
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