[Openicc] Assigning ICC profiles to pinter driver settings part 2

[Jan-Peter Homann]

Hello list,
After reading the mails in the list, I´m currently not convinced, that 
the OS level configuration like Oyranos or colord is the best solution 
for assigning an ICC profile to printer driver settings.

 From my personal experience I rather would prefer a solution where it 
is possible to assign an ICC profile directly in the printer driver 
provide an interface to make the ICC profile for the current active 
setting available to to services / applications sending raster-data to 
the printer driver.

This would allow e.g. following use cases

1) predefined standard settings with canned profiles
The printer driver is delivered with canned profiles and the user don´t 
changes anything during daily work

2) predefined standard settings modied from the user
The canned profiles for a standard setting are used, but the user has 
changed settings like e.g. enhancing contrast brightness or saturation.

3) individual profile from the user
The user can print a testchart without application of a color 
transformation and assigns the resulting profile directly in the driver 
setting.

If a profiling service is triggered directly from the driver, it is easy 
to integrate the driver settings into the ICC-profile as metadata for 
documentation and troubleshooting.


4) Where to apply the color transformtion from source colorspace of the 
rasterdat to the target device colorspace of the printer driver setting ?
I don´t know if CUPS has mechanism for pulling a ICC from the driver. If 
yes, CUPS would be ricght place.
If not, we have to discuss if CUPS should be enhanced with such 
functionality or if CUPS delivers only with rasterdata with an ambedded 
source profile (and may be a rendering intent) and the color 
transformation of raster-data is handled also in the printer driver.

5) Whats about PDF printing data ?
PDF allows individual profiles for individual objects and also the 
definition of a global document colorspace (Output Intent).
The PDF2Raster engine would render all individual objects colors 
including transparencies to a flat raster file and embeds the output 
intent into the raster file.


It would be nice to get some comments on the described workflow


best regards
Jan-Peter


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