Tables are specified as
Size Content
4 number of entries for component one
4 number of entries for component two
4 number of entries for component three
number * 4 entries for component one (in ascending device component order)
number * 4 entries for component two
number * 4 entries for component three
An entry is packed in the form
&BBGGRRDD
where &BBGGRR is the "standard" colour for
either &0000DD device component one
or &00DD00 device component two
or &DD0000 device component three
(i.e. the table gives a mapping for a single pure device component to the standard RGB colour)
To convert a device colour into a standard colour ColourTrans
· splits the device colour into its 3 components
· looks up each component in the calibration table
· for entries not in the table performs linear interpolation on the two bounding values
· sums the 3 standard colours derived from each of the 3 components
For an interesting effect try the table
&00000002
&00000002
&00000002
&00000000
&7F7F00FF
&00000000
&7F007FFF
&00000000
&007F7FFF
Normality can be restored with
&00000002
&00000002
&00000002
&00000000
&0000FFFF
&00000000
&00FF00FF
&00000000
&FF0000FF
or by passing an invalid table to ColourTrans_SetCalibration, generating an error and restoring the default calibrartion.
The default calibration for the screen is linear - screen device colours are assumed to be standard colours.
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