[argyllcms] Re: Low ink limit & gamut mapping problem
- From: Nikolay Pokhilchenko <nikolay_po@xxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Fri, 26 Jun 2009 17:24:06 +0400
Thank You, Bert! I think the black generation doesn't affect on effect at gamut
boundaries because the black generation rules don't work when the ink limit and
maximum channel value are both achieved.
I've set limit as high as possible, 200%. The comfort value for paper is about
180-190%, but I select 200% to preserve the gamut edges below midtones.
May the individual channel limits help in my case without significant gamut
retreat?
-----Original Message-----
From: Bret Hesler <bhesler@xxxxxxxxxxxxxx>
To: <argyllcms@xxxxxxxxxxxxx>
Date: Fri, 26 Jun 2009 08:59:07 -0400
Subject: [argyllcms] Re: Low ink limit & gamut mapping problem
> It is the ink limit that is causing the cavities in your dark gamut. If you
> consider the Red Green and Blue points on the gamut, they are 100% of two
> colors, totaling 200%, which is your ink limit. To get darker, especially in
> a high GCR setup, the addition of black requires the reduction of the
> primaries (10K 95C 95M, 20K 90C 90M, 50K 75C 75M, 100K 50C 50M all to
> maintain the 200% ink limit)
>
> Is the 200% ink limit necessary to avoid ink puddles or making the paper
> wavy? I would suggest you find a setting in your driver that reduces the
> individual ink output so you can use a higher ink limit, or just try a
> higher ink limit with your current settings if you can.
>
> Bret
>
>
> On 6/25/09 2:19 PM, "Nikolay Pokhilchenko" <nikolay_po@xxxxxxx> wrote:
>
> > Hello all!
> >
> > I have an inkjet printer with pigment inks. My aim is the printing on plain
> > paper with the determined ink limit of 200 percent.
> > The problem is in resulting print gamut: the gamut have three cavities on
> > his
> > low sides, so the Argyll gamut mapping algorithm warps the highly saturated
> > gradients.
> > Please, take a look at my *.ti3 attached. Wile both perceptual or relative
> > mappings, the dark saturated areas gradients are highly jugged, right up to
> > inversion of lightness on gradients.
> > I have try the different black generations: "-kp 0 0.14 1 1 1.29 -l200
> > -L100"
> > and "-kx -l200 -L100", but the gamut problem, of course, still persist. I've
> > try the different profile quality settings - even "-qu", but while -qu mode
> > the bands on gradients are more narrow but still unacceptable.
>
>
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