[Openicc] Gutenprint, GhostScript, Canned profiles, sRGB workflow

[Kai-Uwe Behrmann]

Am 04.03.11, 11:28 +0100 schrieb Jan-Peter Homann:
> Hello all,
>
> I want to describe a concept for implementing an ICC based print color 
> workflow for office / sRGB community step by step.
> Please take in consideration, that we have alreay applications like 
> Photoprint, which are offering individual profiling of the printing patch for 
> color aware photo community.
>
> Starting with very focused solution for the sRGB office market, allows us to 
> reduce the UI and all the configurations needed for implementing a first 
> working version. For shure, future versions should have more option to 
> support both the needs of sRGB office and more advanced use cases.
>
> 1) General description of the concept:
> Target user cases are all applications which are generating RGB-PostScript or 
> DeviceRGB-PDF. This includes e.g. all kinds off office applications
>
> Technically:
> - Focused on canned profiles
> - Focused on cupsGutenprint as printer driver
> - Focused on GhostScript as xxxtoraster
> - Using cupsICC
> - using a static PPD for describingt he connection between driver settings 
> and ICC profiles
> - The "no colormanagement printing path" will be installed in a future 
> version
>
>
> The Gutenprint Part:
> - Create for a reference printer, driver settings with ICC profiles for every 
> setting
> - The driver settings and ICC profiles are organized by Mediatype and 
> resolution
> - Create a PPD, where the driver settings are exposed only through the 
> MediaType and Resolution only according cupsICC specification
> - Make shure, that every combination of mediatype and Resolution offered 
> through the PPD directs to a defined setting with ICC profile
> - provide an simple installer for both the driver incl. settings, the PPD and 
> the ICC profiles incl. path

A example along that line would be helpful for vendors. It could 
demonstrate how to handle the cups colour qualifiers, additional 
calibaration settings and non colour related options.

> The GhostScript Part:
> - Define a way, that the profile from cupsICC is used as target profile in 
> GhostScript

I guess this is distribution specific. But I am not sure.

> - Deliver an installer for enabling this possibilty

RPM and debian packages can be recommended. The linuxprinting people are 
as well working with a system to install drivers automatically.

> The enduser experience should be as following;
> - Install driver, ICC-profiles and PPD
> - Install GhostScript tools, for catching cupsICC profile
> - Print with the options offered through the PPD and be happy with the result

> 2) Looking forward to the "No Colormanagement Print Path"
> Gutenprint is a real CMYK printer driver and needs CMYK charts to be 
> profiles. The standard print spool files are RGB PostScript or RGB PDF.
> Offering the "No Colormanagement Option" for the standard printing path makes 
> no sense. As the "No Colormanagement Option" is only needed for printing

Not exactly. It is as well useful for application side proofing and other 
early colour binding tasks.

> profiling charts, it would make sense to offer an utility, which can print 
> the profilinfing chart directly with a given setting to Gutenprint (without

With the DeviceXXX + OutputIntent approach the calibration tool could 
create a print ready PDF/X, which should simply pass through unmolested. 
No need to create a specialised tool other than to tag existing test 
charts with the OutputIntent.

> the nned of GhostScript...) and a second utility to update the PPD files and 
> install ICC-profiles for the updated PPD file.

Agreed, that would make sense.


kind regards
Kai-Uwe Behrmann
-- 
developing for colour management 
www.behrmann.name + www.oyranos.org