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neutralizing color

neutralizing color

2013-10-20 by <goch@...>

Is there any way to "regularize" the process of "correcting" color to produce a desired output?

I have an X-rite 810 densitometer, which gives me RGB values, and a ColorMunki, which gives me Lab values. Thus, I can read the color values for the patches of a linearized 21-step grayscale and see how far a print is from some desired color.

It is not at all obvious how to use these values to increase or decrease cyan, magenta or yellow inks to achieve, for example, a neutral outcome. *Are* these values any more useful than simply eyeballing the print?

Myron



Re: [QuadtoneRIP] neutralizing color

2013-10-20 by Paul Roark

As far as I know learning the color wheel and adjusting the colors manually is still the best approach. The spectros are worth the money.

Someday printers, drivers, and color management software may be good enough to simply use a standard color managed workflow, but I don't think we're there yet.

Paul
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On Sun, Oct 20, 2013 at 7:14 AM, <goch@...> wrote:

Is there any way to "regularize" the process of "correcting" color to produce a desired output?


I have an X-rite 810 densitometer, which gives me RGB values, and a ColorMunki, which gives me Lab values. Thus, I can read the color values for the patches of a linearized 21-step grayscale and see how far a print is from some desired color.

It is not at all obvious how to use these values to increase or decrease cyan, magenta or yellow inks to achieve, for example, a neutral outcome. *Are* these values any more useful than simply eyeballing the print?

Myron




Re: [QuadtoneRIP] neutralizing color

2013-10-21 by Ernst Dinkla

On 10/20/2013 04:14 PM, goch@... wrote:
> Is there any way to "regularize" the process of "correcting" color to
> produce a desired output?
>
>
> I have an X-rite 810 densitometer, which gives me RGB values, and a
> ColorMunki, which gives me Lab values.  Thus, I can read the color
> values for the patches of a linearized 21-step grayscale and see how far
> a print is from some desired color.
>
> It is not at all obvious how to use these values to increase or decrease
> cyan, magenta or yellow inks to achieve, for example, a neutral outcome.
>   *Are* these values any more useful than simply eyeballing the print?
>
> Myron


The values are useful next to eyeballing. Be aware that the Munki does 
not activate/measure the OBA effect of papers that have OBAs aboard.
Your eyes will with the display light conditions you neutralise the 
prints for.

The 810 does not measure UV light either. Whether that is achieved by a 
UV cut filter on both lamp and sensor I do not know. With both, the tone 
range reading should be similar to that of the Munki without the color 
information of course.

-- 
Met vriendelijke groet, Ernst Dinkla

http://www.pigment-print.com/spectralplots/spectrumviz_1.htm
December 2012: 500+ inkjet media paper white spectral plots.

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