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Digital BW, The Print

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Message

Re: posterisation - how to defeat

2002-10-03 by B. Alex Pettit Jr.

Frank,

I have a 100 step greyscale I can email to you. I recommend you analyze the overall grey you are printing in a resolution finer than the 21 step chart. I am having a quite challenging time working on a set of curves for a 2000P using the MIS FSe inkset. Flat spots in the curve are much more visible in a real print than in that 21 step analysis. The graduated scales in the PiezoTest print are also valuable to ensure there smooth transitions. I think 8 bit i.e. 256 levels of grey ( 0.4 % steps ) are not your problem.

Alex
Orlando Fl


--- In DigitalBlackandWhiteThePrint@y..., "frankg_photo" <frank@f...> wrote:
> Even with using 16 bit scans and doing the major curve/level adj 
> before switching to 8 bit, I still have a problem with posterisation 
> in areas of my prints.
> 
> I have tried the same neg/scan on several paper samples I had (Royal 
> Renaissance (Photo Rag), Eclipse Satine Soft & the Bright, EAM) & 
> it's pretty much the same on all.
> 
> I am using MIS sepia>neutral inkset in an 1160 with Paul's curves.
> 
> In the past some have reported duplicating the background layer 
> and/or combining 2 curve adjustment layers and/or adjusing the 
> opacities - this is a muddle for me.
> 
> can anyone clarify this workflow or suggest another way I can try and 
> beat the posterization blues
> 
> thanks
> Frankg

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