[scribus] How to assure pure black and not rich black.
John at T4sLtd.co.uk
Sat Jun 27 13:28:52 CEST 2009
Gregory Pittman wrote:
> John Culleton wrote:
>> I presume this can be done through the correct color profile. Or
>> perhaps it requires a redefinition of the black color swatch. Or maybe
>> it is the default. The manual defines rich black but does not explain
>> at that point how to get either rich black or pure black.
>> The issue comes up because some process color presses will not accept
>> a combination of colors which together add up to more than 240% total
>> Guidance appreciated.
> Pure black, AFAICT, is defined by CMYK as 100% K, 0% C, M, and Y. There
> can be a problem in Scribus trying to get pure black as an end result,
> since and RGB with 0 for each value will probably not result in pure
> black. We've had a number of submissions to the list where it seems the
> sender gets obsessed with getting pure black, and consequently gets
> upset at not achieving it.
> In the end, I think it should come down to getting the visual color of
> black you want with the printed product rather than some absolute
> mathematically pure black.
Accepted, but presumably it is also a good thing to minimise ink
use as long as this doesn't compromise the quality of the black ?
John Beardmore, MSc EDM (Open), B.A. Chem (Oxon), CMIOSH, AIEMA, MEI
Managing Director, T4 Sustainability Limited. http://www.T4sLtd.co.uk/
Energy Audit, Carbon Management, Design Advice, Sustainable Energy
Consultancy and Installation, Carbon Trust Standard Registered Assessor
Phone: 0845 4561332 Mobile: 07785 563116 Skype: t4sustainability
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