Re: CMYK settings
Re: CMYK settings
- Subject: Re: CMYK settings
- From: Henrik Holmegaard <email@hidden>
- Date: Thu, 29 May 2003 09:03:48 +0200
faro mojahedi <email@hidden> wrote:
>How can I decipher such data as dot gain, GCR, black
>generation, total ink limit from a custom CMYK profile
>or one that comes with Photoshop such as SWOP Coated
>V2?
>Is there an application out there that does that and
>would also help me edit the data?
To understand the offset printing process at the ABC level, one way to
go about it is to look up PostScript Screening, Adobe Accurate Screens,
by Peter Fink (with Lars Borg and Russell Brown in the wings).
This book describes the technology built into PostScript Level 2, both
at the level of what exactly a halftone, a halftone cell, a halftone
threshold array and a halftone dot is and at the more general level of
how halftone dots are mangled by production processes.
To understand the offset printing process at the level of the software
that generates the separations profile which you plug into InDesign you
need to look at documentation from software manufacturers.
To understand color process control software and hardware, that is,
instruments and instrument hardware, you also need to look at
documentation. (Specifications and standards reference a number of
parameters which may not be easy to identify in the UI of your control
product.)
Note that the ICC Specification defines a file format, but neither
gamut compression nor color separation technologies.
The SWOP specification and the ISO 12647 standard don't define gamut
compression, but give aim values (densitometric or colorimetric or
both) for print production and recommendations on process parameters
like dot shape, black generation and more.
Henrik
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