[Openicc] GoSoC 2011: CPD and Color Management

edmund ronald edmundronald at gmail.com
Tue May 3 20:40:49 PDT 2011


 Do you also distinguish Graeme's states 1,2,3 below in this way for
Gutenprint? Or would you place the boundaries differently?


On Wed, May 4, 2011 at 3:52 AM, Graeme Gill <graeme at argyllcms.com> wrote:
> edmund ronald wrote:
>>  However I do think ink settings ALSO need to be able to exist without
>> the profile since the ink settings precede the profile, and since it
>> is extremely advantageous to be able to adopt the ink settings from
>> some known paper as a quick starting point to work with another paper.
>> Ink settings, as we agree do precede profiles, and therefore need to
>> be able to exist and be invoked independently of profiles.
> Yes. Such a format is needed anyway, to communicate the settings
> between the print system and the user and or profiling software,
> so that they can be embedded in the profile.
> Note that a print system mechanism to enable or disable calibration
> and separation is also needed to support print calibration.
> In general for something like an inkjet printer with light & dark inks
> there are four (reasonably distinct) printer states:
> * raw with setting adjustments:
>    Raw response of the physical color channels. There are still
>    resolution, dot size and screening settings, plus a
>    range setting (maximum per color value) involved.
>    This state is used so as to be able to determine these settings,
>    as well as determine the light and dark channel crossovers.
> * separated and adjusted
>    The dot level settings are set, and the light and dark channels
>    have been combined and crossed over to create the set of
>    logical device color channels. There are settings and/or tables
>    that have been created to do this.
>    This state is used to create calibration curved.
> * calibrated, separated and adjusted
>    The logical device color channels have had calibration
>    curves applied to them.
>    This state is used to create profiles.
> * Profiled, calibrated, separated and adjusted
>    The device ICC profile is used to convert incoming
>    colorspaces to the devices colorspace.
>    This state is the normal end user printing state.
> To setup a printer, you need access to all of these states, not just
> profiled/not profiled.
> Graeme Gill.
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