[Openicc] What is exactly needed for color management ... driver setup PPD

Max Derhak max.derhak at onyxgfx.com
Tue May 31 19:19:57 PDT 2011

The Metadata's tag is a dict tag type which is limited to representing
data strings with a 32 bit length.  Therefore a 1 meg or so dict entry
shouldn't be a problem.

Max Derhak
Senior Software Architect
max.derhak at onyxgfx.com

-----Original Message-----
From: openicc-bounces+max.derhak=onyxgfx.com at lists.freedesktop.org
[mailto:openicc-bounces+max.derhak=onyxgfx.com at lists.freedesktop.org] On
Behalf Of Robert Krawitz
Sent: Tuesday, May 31, 2011 8:10 PM
To: Open ICC Color Managment
Cc: openicc at lists.freedesktop.org
Subject: Re: [Openicc] What is exactly needed for color management ...
driver setup PPD

On Tue, 31 May 2011 21:44:27 +0100, Richard Hughes wrote:
> On 31 May 2011 21:13, Jan-Peter Homann <homann at colormanagement.de>
>> Is it correct, that you are using the cupsICC qualifier specified in
the PPD
>> of the printer, for doing the described match of printer profile and
>> setting ?
> Correct -- See http://colord.hughsie.com/faq.html#qualifiers
>> this leads for me for more questions:
>> - Is it possible to prepare a printer profile, that it will
>> match the corrects cupsICC qualifiers for a given printer ?
> Yes, although we haven't actually sat down and defined a DICT key and
> value format that can be used in colord and oyranos. I suppose it
> could be something like:
> KEY:  "QUALIFIER_defaults"
> VALUE: "RGB.Glossy.*,RGB.Plain.*"
> KEY:  "COLORD_objectid"
> VALUE: "cups-Photosmart-B109a-m"
> But better ideas certainly welcome.

Just make sure the value can be arbitrarily large, so that we can pass
a serialized Gutenprint settings object through this.  That settings
object might include LUTs for each channel, with up to 65536 values
per channel expressed in text format floating point number.  In other
words, a limit of less than a megabyte or thereabouts could get us
into trouble, and once it's that large, you might as well forget about
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