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RE: non-ICC rendering intents and black preservation

From: Leonard Rosenthol <lrosenth@adobe.com>
Date: Sun, 21 Mar 2010 14:30:37 -0700
To: Chris Lilley <chris@w3.org>, "public-svg-wg@w3.org" <public-svg-wg@w3.org>
Message-ID: <D23D6B9E57D654429A9AB6918CACEAA97CA65922FB@NAMBX02.corp.adobe.com>
LCMS is not necessarily following the guidance of the ICC - so you may want to decide who is driving your choices.

The ICC is currently working with the ISO 32000 (PDF) and ISO 15930 (PDF/X) committees on a standard which will define a variety of channel preservation options for PDF.  Those same options could certainly make sense in SVG under certain use cases such as repurposing.

On a related note, we recently added support for black point compensation as a graphic state attribute to ISO 32000-2, and you may wish to consider doing so for SVG moving forward.

Leonard

-----Original Message-----
From: public-svg-wg-request@w3.org [mailto:public-svg-wg-request@w3.org] On Behalf Of Chris Lilley
Sent: Sunday, March 21, 2010 11:47 AM
To: public-svg-wg@w3.org
Subject: non-ICC rendering intents and black preservation

Hello public-svg-wg,

I noticed the following in the LCMS2 tutorial:


> LittleCMS 2.0 does add following non-ICC intents by default:
> • INTENT_PRESERVE_K_ONLY_PERCEPTUAL
> • INTENT_PRESERVE_K_ONLY_RELATIVE_COLORIMETRIC
> • INTENT_PRESERVE_K_ONLY_SATURATION
> • INTENT_PRESERVE_K_PLANE_PERCEPTUAL
> • INTENT_PRESERVE_K_PLANE_RELATIVE_COLORIMETRIC
> • INTENT_PRESERVE_K_PLANE_SATURATION
> All those new intents deal with black preservation. They are described below, see the black preservation section.

This impacts us two ways, one is the preserve-black issue and the other is that the list of rendering intents is no longer limited to four standard ones. So it seems we need an additional string value as well as the keywords.

Link to the docs
http://github.com/mm2/Little-CMS/blob/master/doc/LittleCMS2.0%20tutorial.pdf


-- 
 Chris Lilley                    mailto:chris@w3.org
 Technical Director, Interaction Domain
 W3C Graphics Activity Lead
 Co-Chair, W3C Hypertext CG


Received on Sunday, 21 March 2010 21:31:19 UTC

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