[Openicc] Re: Krita... (was color adjusting...)

[Jan-Peter Homann]

Hello Boudewijn, hello list

question to krita colorspaces
-------------------
As far as I understand, krita is able to manipulate RGB and CMYK-images 
and other special colorspaces wich are mainly some kind of RGB-derivates.

Am I right, that the user can open e.g. an CMYK-file, use an embedded 
profile, manipulate in CMYK-colorspace and save the image with embedded 
profile ?

Can the user  also work in RGB, convert via lcms to cmyk and manipulate 
the picture in CMYK colorspace ?

printing from krita
-------------------
Some months ago, we had a discussion about using icc-profiles for 
printing. The gutenprint project plans to integrate in the next release 
icc-profile support with lcms inside.

standard place for icc-profiles
----------------------------
We had an discussion for such place, and Kai Uwe Behrmann already build 
an installer for standard ICC-profiles:

 >>
at
<http://www.behrmann.name/index.php?option=com_weblinks&task=view&catid=71&id=39>
a first version (RPM) can be downloaded. I invite you to reread the
included LICENSE file, as packaging work of others is new to me.
<<

May a fute version of krita can use this place for profiles.


:-) Jan-Peter


Boudewijn Rempt schrieb:
> On Monday 13 June 2005 13:50, Jan-Peter Homann wrote:


>>First I want to understand the actual colormanagement architecture of
>>krita. This is something all the other members of the openicc list are
>>also interested in.
> 
> 
> Well, architecture is a big word. The different colorspaces Krita uses (and 
> there are some very weird ones, like one based on Raph Levien's watercolor 
> simulation with eight color channels) are implemented as plugin modules. Each 
> plugin module implements a number of useful functions, like one to mix 
> between colors. 
> 
> Conversion between colorspaces is done through lcms. 
> The basics are done:
> 
> * Reading/writing profiles to external file formats
> * Reading/writing profiles in Krita files (although there's room for  
>  improvement here)
> * When pasting an image from an external source, the user can apply a 
>   profile, when cutting & pasting inside Krita, the image data being
>   pasted is transformed before being added to the destination data.
> * Images are transformed using the monitor profile for display (but I wish 
>   there were some standard location for a calibrated monitor profile).
> 
> What's missing:
> 
> * Using the monitor profile to transform the data in the color selectors 
>  (working on that.)
> * Printing is almost non-existent. I'm hoping that there's some library 
>   that I can use for that, perhaps from Scribus -> it's on my to-investigate 
>   list.
> * There's no system-wide place where we can find profiles, so we install
>   them ourselves.

>>The second idea is to use abstract profiles and devicelink-profiles as
>>universal format for the exchange of coloradjustments.
>>This is also very interesting for the other members of the openicc
>>mailinglist.
> 
> 
> That's Casper's turf, I think. At the moment Krita's gui, the color selectors 
> and the tools toolbox demand my attention, and Casper is busy making sure 
> Krita can handle any colorspace anyone wants to write a module for, no matter 
> the number of channels or the number of bits any individual channel wants.

-- 
--

homann colormanagement ------ fon/fax +49 30 611 075 18
Jan-Peter Homann ------------- mobile +49 171 54 70 358
Kastanienallee 71 ------- http://www.colormanagement.de
10435 Berlin --------- mailto:homann at colormanagement.de