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@@ -10,31 +10,24 @@
<h2>Description of the .cal format</h2>
Device calibration information. This is ASCII text, <a
href="File_Formats.html#CGATS">CGATS</a>, Argyll specific format,
- used
- to hold a description of device setup information that brings it to
- a
- desired calibration state. Calibration files are created by <a
- href="synthcal.html">synthcal</a>, <a href="dispcal.html">dispcal</a>
+ used to hold a description of device setup information that brings
+ it to a desired calibration state. Calibration files are created by
+ <a href="synthcal.html">synthcal</a>, <a href="dispcal.html">dispcal</a>
and <a href="printcal.html">printcal</a>.<br>
<br>
While fully compatible with the CGATS.5 Data Exchange Format, the
particular required keywords and fields are unique to Argyll, hence
- an
- Argyll specific file identifier <span style="font-weight: bold;">CAL</span>
+ an Argyll specific file identifier <span style="font-weight: bold;">CAL</span>
is used to avoid confusion with standard ANSI or CGATS files.<br>
<br>
The <span style="font-weight: bold;">.cal</span> format changes
- from
- time to time with new releases, to add new functionality, but
- generally
- retains backwards compatibility. Note that in the description below,
- the word "may" indicates an optional component, while the word
- "shall"
- indicates a necessary component.<br>
+ from time to time with new releases, to add new functionality, but
+ generally retains backwards compatibility. Note that in the
+ description below, the word "may" indicates an optional component,
+ while the word "shall" indicates a necessary component.<br>
<br>
Generally a .cal file contains only one table, the table containing
- the
- setup information. <br>
+ the setup information. <br>
<br>
<br>
The table contains the following:<br>
@@ -50,11 +43,12 @@
style="font-weight: bold;">DESCRIPTOR</span>, <span
style="font-weight: bold;">ORIGINATOR</span>, or <span
style="font-weight: bold;">CREATED</span> keywords and values (as
- per
- CGATS).<br>
+ per CGATS).<br>
<br>
There shall be a <span style="font-weight: bold;">DEVICE_CLASS</span>
keyword that has a value of <span style="font-weight: bold;">"OUTPUT</span>",
+
+
"<span style="font-weight: bold;">DISPLAY</span>" or <span
style="font-weight: bold;">"INPUT"</span>.<br>
This indicates what type of device the calibration information is
@@ -62,65 +56,100 @@
<br>
A <span style="font-weight: bold;">"DISPLAY"</span> type device may
have a <span style="font-weight: bold;">VIDEO_LUT_CALIBRATION_POSSIBLE
- </span>keyword that
- must have a value of "<span style="font-weight: bold;">NO</span>" or
- "<span style="font-weight: bold;">YES</span>", to indicate whether
- the display has the ability to be calibrated by loading VideoLUT
- values.<br>
+
+
+ </span>keyword that must have a value of "<span style="font-weight:
+ bold;">NO</span>" or "<span style="font-weight: bold;">YES</span>",
+
+ to indicate whether the display has the ability to be calibrated by
+ loading VideoLUT values.<br>
+ <br>
+ A <span style="font-weight: bold;">"DISPLAY"</span> type device may
+ have a <span style="font-weight: bold;">TV_OUTPUT_ENCODING </span>keyword
+
+ that must have a value of "<span style="font-weight: bold;">NO</span>"
+ or "<span style="font-weight: bold;">YES</span>", to indicate
+ whether the calibration was created withing the video (16-235)/255
+ compressed range of device value. This is used to signal to a
+ VideoLUT loader whether calibration values should be converted to
+ video encoded range when loaded into hardware. The calibration
+ values stored in the .cal file are never video encoded themselves,
+ i.e. 0.0 is always device minimum, and 1.0 is always device maximum.<br>
<br>
There shall be a keyword <span style="font-weight: bold;">COLOR_REP</span>
that has a value that indicates what colorspaces of the device
- values.
- The colorspaces shall be encoded with one&nbsp; or two letters
- per
- component. The device spaces shall use the
- following letter encoding:<br>
+ values. The colorspaces shall be encoded with one&nbsp; or two
+ letters per component. The device spaces shall use the following
+ letter encoding:<br>
<br>
<span style="font-weight: bold;"><span style="font-weight: bold;"></span></span>&nbsp;&nbsp;&nbsp;
Cyan
+
+
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+
+
C<br>
&nbsp;&nbsp;&nbsp; Magenta &nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&nbsp; M<br>
&nbsp;&nbsp;&nbsp; Yellow &nbsp; &nbsp;
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+
+
Y<br>
&nbsp;&nbsp;&nbsp; Black &nbsp;&nbsp;
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+
+
K<br>
&nbsp;&nbsp;&nbsp; Orange &nbsp;&nbsp;
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+
+
O<br>
&nbsp;&nbsp;&nbsp; Red
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+
+
R<br>
&nbsp;&nbsp;&nbsp; Green &nbsp; &nbsp;&nbsp;
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+
+
G<br>
&nbsp;&nbsp;&nbsp; Blue &nbsp;&nbsp; &nbsp;&nbsp;
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+
+
B<br>
&nbsp;&nbsp;&nbsp; White &nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; W<br>
&nbsp;&nbsp;&nbsp; Light Cyan
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+
+
c<br>
&nbsp;&nbsp;&nbsp; Light
-Magenta&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+ Magenta&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+
+
m<br>
&nbsp;&nbsp;&nbsp; Light
-Yellow&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+ Yellow&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+
+
y<br>
&nbsp;&nbsp;&nbsp; Light
-Black&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+ Black&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+
+
k<br>
&nbsp;&nbsp;&nbsp; Medium Cyan&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2c<br>
&nbsp;&nbsp;&nbsp; Medium Magenta
- &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
- 2m<br>
+ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2m<br>
&nbsp;&nbsp;&nbsp; Medium Yellow
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2y<br>
&nbsp;&nbsp;&nbsp; Medium Black
@@ -130,53 +159,47 @@ Black&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb
There may be an a prefix <span style="font-weight: bold;">i</span>
preceding the device space letter encoding, indicating that although
the space appears to be an additive space, it is in fact a
- subtractive
- device.<br>
+ subtractive device.<br>
<br>
Typical values might be: "<span style="font-weight: bold;">RGB</span><span
style="font-weight: bold;"></span>" for an RGB display, "<span
style="font-weight: bold;">iRGB</span><span style="font-weight:
- bold;"></span>"
- for an RGB printer, "<span style="font-weight: bold;">CMYK</span>"
- for
- a
- printer, "<span style="font-weight: bold;">RGB"</span> for an RGB
- scanner.<br>
+ bold;"></span>" for an RGB printer, "<span style="font-weight:
+ bold;">CMYK</span>" for a printer, "<span style="font-weight:
+ bold;">RGB"</span> for an RGB scanner.<br>
<br>
The <span style="font-weight: bold;">NUMBER_OF_FIELDS</span>
- keyword
- shall have a value that indicates the number of fields in each data
- set, e.g. <span style="font-weight: bold;">4</span> (as per CGATS).<br>
+ keyword shall have a value that indicates the number of fields in
+ each data set, e.g. <span style="font-weight: bold;">4</span> (as
+ per CGATS).<br>
<br>
The start of the declaration of the fields shall be marked by the <span
style="font-weight: bold;">BEGIN_DATA_FORMAT</span> keyword (as
- per
- CGATS).<br>
+ per CGATS).<br>
<br>
The fields shall use the standard CGATS pattern of the full
- colorspace
- identified followed by the individual colorant identifier. There
- shall
- be an initial input index value identified by the letter <span
- style="font-weight: bold;">I</span>.<br>
+ colorspace identified followed by the individual colorant
+ identifier. There shall be an initial input index value identified
+ by the letter <span style="font-weight: bold;">I</span>.<br>
<br>
- For an RGB device, the
- following fields would be used:<br>
+ For an RGB device, the following fields would be used:<br>
<br>
&nbsp;&nbsp;&nbsp; <span style="font-weight: bold;">RGB_I</span>&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;
+
+
The device value input value between 0.0 and 1.0.<br>
&nbsp;&nbsp;&nbsp; <span style="font-weight: bold;">RGB_R</span>&nbsp;&nbsp;&nbsp;
&nbsp;
+
+
The Red device value input value between 0.0 and 1.0.<br>
&nbsp;&nbsp;&nbsp; <span style="font-weight: bold;">RGB_G</span>
&nbsp;&nbsp; &nbsp; The Green device value input value between 0.0
- and
- 1.0.<br>
+ and 1.0.<br>
&nbsp;&nbsp;&nbsp; <span style="font-weight: bold;">RGB_B</span>
&nbsp;&nbsp; &nbsp; The Blue device value input value between 0.0
- and
- 1.0.<br>
+ and 1.0.<br>
<br>
The corresponding field names for a CMYK device would be <span
style="font-weight: bold;">CMYK_I</span>, <span
@@ -198,16 +221,15 @@ Black&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb
CGATS).<br>
<br>
Each set of data shall be on one line, and shall be separated by
- white
- space. All values shall be normalized to lie between 0.0 and 1.0.<br>
+ white space. All values shall be normalized to lie between 0.0 and
+ 1.0.<br>
<br>
The end of the values of the data sets shall be marked by the <span
style="font-weight: bold;">END_DATA</span> keyword (as per CGATS).<br>
<br>
There may then be device type specific extra tables that hold target
- or
- device behavior information. These will be specific to the tool that
- creates that particular type of calibration.<br>
+ or device behavior information. These will be specific to the tool
+ that creates that particular type of calibration.<br>
<br>
Generally any other keywords and values will be ignored.<br>
<br>
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-17 08:11:34 +0000