Information document for the c2esp filter.
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This is a cups raster filter to enable printing on Kodak ESP series AiO printers

Version 2.5  (c2esp25) was significantly changed to allow better colour management.
The following things can be changed in the ppd driver file to influence the colours.

    Attribute cupsInkLimit "" "2.0"

This attribute limits the total amount of ink in a dark area (the sum of all the colours)
is limited to the value given, eg 2.0 limits the total to two colours at full intensity,
which saves ink and avoids creating very wet patches.

	ColorProfile 600x1200dpi/- 1.0 1.4
		1.0 -0.1 0.0 
		-0.1 1.0 0.0 
		0.0 -0.4 1.0 

On the line "ColorProfile..." the 1.0 is a density factor (value between 0.0 and 1.0),
the 1.4 is gamma. Increasing gamma makes mid tones lighter.
The 3x3 matrix that follows allows colours to be adjusted.
It modifies the CMY levels as follows:

        input 
       C  M  Y

 o C   Cc Cm Cy
 u M   Mc Mm My
 t Y   Yc Ym Yy

For example: Moutput = Mc*Cinput + Mm*Minput + My*Yinput
I made Mc = -0.1 in order to make blue areas less purple.
and Ym = -0.4 in order to make red areas less orange.

Read more details at http://www.cups.org/documentation.php/doc-1.6/ref-ppdcfile.html


There is a second profile for 300x1200dpi

	ColorProfile 300x1200dpi/- 1.0 1.0
		1.0 0.0 0.0 
		-0.1 1.0 0.0 
		0.0 -0.3 1.0 
