Re: Controlling 6 or 7 inks
Re: Controlling 6 or 7 inks
- Subject: Re: Controlling 6 or 7 inks
- From: "Ernst Dinkla" <email@hidden>
- Date: Tue, 29 Oct 2002 12:45:41 +0100
----- Original Message -----
From: "Johan Lammens" <email@hidden>
To: <email@hidden>
Sent: Tuesday, October 29, 2002 10:15 AM
Subject: Re: Controlling 6 or 7 inks
>
On Tuesday, October 29, 2002, at 02:59 AM,
>
email@hidden wrote:
>
>
> From: Marc Levine <email@hidden>
>
> Date: Tue Oct 29, 2002 3:00:05 AM Europe/Madrid
>
> To: <email@hidden>, <email@hidden>
>
> Subject: Re: Controlling 6 or 7 inks
>
>
>
> As a side note, I like to be clear that light inks do not increase a
>
> printer's gamut. Any color you can make with light-cyan, you can make
>
> with
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> cyan. The reason that light inks exist is for smoothness only. The
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> increased
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> quality that you get via light ink usage is a result of 2 phenomena:
>
> you
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> have to print twice as many dots with the light ink as you would with
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> the
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> dark, and the fact that your eye cannot find the edge of a light ink
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> droplet.
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>
I have only one minor quibble with your explanation: using light inks
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(light c, light m) actually does increase the gamut compared to an
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equivalent system with only "dark" inks. The gains are modest but
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noticeable, especially in the light chromatic colors. The explanation
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can apparently be found in Beer's law, and comes down to the fact that
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using light inks means more ink and hence less white paper for the same
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density, as you correctly pointed out. White paper (light) in the
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mixture desaturates colors, so less white means less desaturation or
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conversely more saturation (chroma).
By using light inks CcMmYK (more coverage = more overlay) the colourmixing
will behave more subtractive compared to smaller CM dots that will be
printed next to one another. That has to influence the gamut one way or
another. Whether that means it is increased by less white paper is harder to
say. The extra white of the paper in CMYK and so less saturation should be
reduced by a good profile. It wouldn't surprise me that the added
subtractive mixing is the actual cause of a slightly wider gamut.
Ernst
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