Re: [Gimp-print-devel] Strategy for profiling Epson R280 with Ultrachrome K3 inks

[Robert K. <rl...@al...>]

Marko Milisavljevic wrote:
> Many thanks for the response. I copied over K3 settings minus gray
> inks, and the results are very promising - printing "uncorrected"
> looks almost passable without a profile, while it looked pretty bad
> with original settings. I can use this as a starting point for icm
> profiling. I do have some followup questions if I may:
> 
> Q: In media/<model>.xml files, PrintMethod parameters are different
> between R280/Claria and R2400/K3, even for same paper types and
> resolutions.
> 
> Should my hybrid file have PrintMethod parameters from R280/Claria or R2400/K3?

R280.  PrintMethod is a hardware programming parameter (adjusts paper 
feed speed and Epson knows what else).

> Q: Paper definitions have "SubchannelCutoff" parameter. What is this
> called in the GUI? Googling it returns nothing.

It's the default value for Light Cyan Transition and Light Magenta 
Transition.  Setting Light Cyan Transition and/or Light Magenta 
Transition is equivalent.

> Q: Ink definition file says:
> 
> ...
>   <shade count="1">1.000000</shade>
>   <shade count="2">1.000000 0.350000</shade>
>   <shade count="2">1.000000 0.200000</shade>
> ...
> 
> Does this mean that 35% M is same density as 100% LM, and thus that
> default setting for "Light Magenta Value" in GUI is 0.35?

Yes.

-- 
Robert Krawitz                                     <rl...@al...>

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