Digital BW, The Print

Brian,

I'm not real sure what workflow you're using.  But, it sounds like the
problems could be with the dark ink(s) being injected by the printer before
there is enough of the lighter ink to hide them. If the problem is due to
the dark grays, I'd expect them to show up closer to 60%.  If they were both
being injected at about the same time due to a grayscale workflow, some RGB
curves might be able to separate where in the image the crossover occurs.
Since the problem area is further down, I'd guess it's the black ink being
injected before the dark grey inks can hide it.  If the workflow you're
using includes the driver being set to "Color Controls" I'd consider
switching that to No Color Adjustment.  That allows the midtones to go all
the way up to their maximum ink limit.  The print might be too dark, so a
grayscale curve or using Create ICC to linearize the system might be needed.

This is sort of a guess, but it might be worth a try.

Paul
www.PaulRoark.com 


> -----Original Message-----
> From: DigitalBlackandWhiteThePrint@yahoogroups.com
> [mailto:DigitalBlackandWhiteThePrint@yahoogroups.com] On Behalf Of Brian
> Chapman
> Sent: Friday, May 12, 2006 10:17 AM
> To: DigitalBlackandWhiteThePrint@yahoogroups.com
> Subject: [Digital BW] Transitions
> 
> In a previous post I mentioned the "stepped" transitions between areas
> of light and dark in some of the images I have tried printing.
> 
> Here's a link to one of the previous messages:
> http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint/message/7715
> 1
> 
> Some additional experimenting and learning has led me to believe that
> the transitions between dark and light in a general sense were only
> part of what I was seeing.  The real issue is between different
> densities of dark where the mixes of ink changes.  When I printed out
> the step wedges from Paul's site (on EEM using Pauls profile for EEM
> and Gamma 2.2 for the printer driver gamma setting) I noticed there
> are a couple of "transition" density levels where the different mixes
> of ink show up more obviously than others - between 70 & 80% and again
> between 80 and 90%.
> 
> For 99% of images this isn't an issue but in images where the sky is
> very dark and therefore has large areas where those transitions
> mentioned above occur it becomes visible - almost like a line across
> the page wherever those transitions occur.  (It's much easier to see
> the transitions on wide areas where it occurs - I didn't notice it
> when I was printing test strips (1"x8") from the center of the image
> below.  This result doesn't occur with BO printing because it's all
> the same ink.
> 
> Here is an example:
> http://www.flickr.com/photos/brianechapman/75838437/
> 
> Does anyone have any suggestions to reduce the effect?
> 
> Sorry for the long post, I just wanted to make sure I gave enough info!
> 
> Thanks!!
> 
> Brian
> http://www.brianchapmanphotography.com
> 
> 
> 
> 
> 
> 
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