Path: utzoo!attcan!darkover!nebulus!druid!darcy
From: darcy@druid.uucp (D'Arcy J.M. Cain)
Newsgroups: comp.graphics
Subject: Re: RGB ---> YMCK
Message-ID: <1990Feb8.233748.11508@druid.uucp>
Date: 8 Feb 90 23:37:48 GMT
References: <1990Feb7.220805.27260@allgfx.agi.oz>
Reply-To: darcy@druid.UUCP (D'Arcy J.M. Cain)
Organization: D'Arcy Cain Consulting, West Hill, Ontario
Lines: 25

In article <1990Feb7.220805.27260@allgfx.agi.oz> cn@allgfx.agi.oz (Con Neri) writes:
>Does anybody know of the proper conversions to produce
>	1) YMCK color images from RGB images.
>	2) RGB images from YMCK images.
>
>Any help with the above will be much appreciated. Please e-mail your reply or 
>post into this newsgroup, I will summarise if there are enough replies.
>
given that the colours range from 0 to 255:

Cyan is 255 - red
Magenta is 255 - green
Yellow is 255 - blue

This will give the primary subtractive colours.  To include black, subtract
the lowest of the CMY values from each (making at least one of them 0) and
the subtracted value is the black component.

The reverse should be obvious.

-- 
D'Arcy J.M. Cain (darcy@druid)     |   Thank goodness we don't get all 
D'Arcy Cain Consulting             |   the government we pay for.
West Hill, Ontario, Canada         |
(416) 281-6094                     |