[argyllcms] Targen & chart gamma correction
- From: Nikolay Pokhilchenko <nikolay_po@xxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Sun, 29 Nov 2009 12:13:33 +0300
-----Original Message-----
From: "Alastair M. Robinson" <profiling@xxxxxxxxxxxxxxxxxxxxxxx>
Date: Mon, 09 Nov 2009 20:51:09 +0000
Subject: [argyllcms] Re: ArgyllCMS V1.1.0 RC1 is now available
>
> Yup - TI1 attached, printtarg command line is a very basic
> printtarg -T -R 66 -i41 -pA4
> and a scan of the first eight columns:
> http://blackfiveimaging.co.uk/temp/TC1_sRGB.jpg
>
> Note that for B1 I tippexed out the spacers, then drew them back in with
> red marker pen!
> That was enough to make strip B readable, but then the instrument choked
> on strip C so I gave up!
>
I have to fully comply with Alastair! Many times I had a problems with chart
reading. The problem arises in case of special inks (thermo transfer for
example) or in case of jet printing with three drop sizes. Both - in usable
ink volume margins.
In such cases there may be high device non-linearity, which can be taken in
account at first step by simple gamma in targen. IMHO the gamma coefficient for
device space in targen can help in difficult cases to achieve the much more
optimal patch spreading and robust chart reading by instrument in strip/auto
mode.
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