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From: lcline@sequent.UUCP (Larry Cline)
Newsgroups: comp.sys.amiga.tech
Subject: Re: QMS plotmaster colors & pantone colors
Message-ID: <49422@sequent.UUCP>
Date: 28 Dec 90 18:32:16 GMT
References: <521358@neabbs.UUCP>
Reply-To: lcline@crg8.UUCP (Larry Cline)
Organization: Sequent Computer Systems, Inc
Lines: 41

In article <521358@neabbs.UUCP> rrs@neabbs.UUCP (RONALD VAN EIJCK) writes:
>Hi there,
>
>Since I am not very good using paintbrushes etc. my knowledge of colormixing
>is very limited. But since one of my customers is using DPAINT & a QMS plot-
>master I am afraid that I have to extend myself.
>
>The problem is : monitor colors != paper colors.
>
This is true.  Unfortunately, you are working with widely disparate
systems here.  Light (for monitors) is subractive and pigment (on paper)
is additive.  Not to mention that it will be different on each printer.

>The solution at the moment is that they have a lot of papers with colors
>on them and find the matching color for the color on screen. they then change
>the colors on screen (using the DPAINT pallet function).
>The colors on screen are wrong then but if you print the picture it looks
>alright. (THIS IS NOT A SOLUTION!)
>
This has been a solution for many years even before they were using computers.
If they have the RGB or HSV settings written out for each desired color
then translation shouldn't be too bad.

>My question is, is there some formula to translate screencolor RGB values
>to QMS plotmaster RGB values. If so I can write a program that reads a
>picture calculates the paper-RGB's and prints the picture.
>
You could do a lookup table based on their current translation that they
are doing by hand.

>Another great option would be to translate PANTONE COLORS (some international
>color numbering system) to RGB values and paper-RGB values
>
I believe Professional Page and/or Professional Draw from Gold Disk support
Panatone.

>thanx for any info,
>
>Ronald van Eijck, R&R Software, RRS@Neabbs.uucp

Larry Cline