[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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