Re: scanning
Re: scanning
- Subject: Re: scanning
- From: Jim Rich <email@hidden>
- Date: Fri, 21 Sep 2001 17:28:07 -0400
On 9/20/01 9:28 AM, "Jamie Quaile" <email@hidden> wrote:
>
can anybody tell me a good setting ( white point and black point) in cmyk
>
space for print.
>
Cheers,
>
Jamie Quaile
>
>
JQ Studios
>
416 410 6970
>
>
email@hidden
>
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colorsync-users mailing list
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http://www.lists.apple.com/mailman/listinfo/colorsync-users
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Jamie,
Do you mean the target values for the white point and black point for
adjusting the highlight and shadow?
And as was mentioned on this list there is no single answer for this
question, but here are some guidelines to follow as a reasonable place to
start. .
The white point of about 80 % of all images are near ( but not exaclty ) a
neutral gray. That is the white with a littlle bit of detail. Common
highlight values are 5 %cvan, 3% magenta and 3% yellow. These values are
not etched in stone. But they are a reasonable place to start with setting
up the highlight.
As for the shadow point of CMYK. This is more involved and depends on your
printing process and such things as how much ink you can print on a press in
the neutral shadow areas. The max ink density values is usually expressed in
a total percent dot value for all colors in the shadow neutral gray areas.
This is often reffered to as the UCR (Undercolor Removal) or GCR (gray
component replacement) values. For example if you printed 100% percent of
each color CMYK the max density would be 400%. In practice this amount of
ink on paper would drive all press people nuts. Usually max ink values might
look like 360%, 320%, 300%, 280% etc. and are based on how well neutral
gray will print in the shadow area.
Hope that9s what you were after
Jim Rich.
| References: | |
| | >scanning (From: Jamie Quaile <email@hidden>) |