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Old 03-17-2006, 03:12 PM   #1
PeterArnel
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Join Date: Jan 2005
Location: North of Swindon in the UK on the edge of the Cotswolds
Posts: 997
Default Dot Gain 2

This is what I like about this site - is that it stimulates the mind.
Dot gain
I will now explain about dot gain .
Firstly dot gain can be controlled - and always has been by pre press compensating for it. The ISO standard 12647 - printing standard was never about acheiving the same tonal value regardless of screen ruling or paper type. It set out what dot gain to expect when you have a 50% digital dot on a film and your pre press company would compensate for the gain and reduce the dot accordingly.
BUT with CTP - a lot of printers have not understood the standard and dont compensate so if they print 150# 50 = 64% 175# = 67% 200# = 71% now the standard says + or - 4% so your 50% digitaol dot could end up either 60% or 75% . This really B******* up CMYK Pantone colours and images .Mid tones start filling in etc etc.
Adobe and Pantone have adopted CMY 50% = 64% K = 67% and so printeradding a compenation curve wilol achieve much better bimages and start matching Pantone Colourbridge colours.
I am sorry to get technical - Colour Management is a major issue - and perhaps this site should have a section for it.

What is really interesting is that its photographers who are really interested in this subject- as they have now been firmly included in the workflow as they cannot hide behind " bodged trannies" -
Peter
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