Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "johndavidgill2003" <jdgill@l...> wrote:
> 
> I'm really impressed (and getting more impressed by the day) with 
> IJC/OPM - thanks to Joe and Richard for their help and also for the 
> new tutorial.
> 
> One question though; When I print the target for linearisation my 
> densitometer reads step 26 darker than step 25 but to the eye there 
> is no difference whatsoever. If I linearise using the readings am I 
> in effect wasting shadow detail by having step 25 and 26 identical to 
> the eye even though step 26 is "densitometer darker"? Would I be 
> better tweaking the inks or the sliders to get a visible difference 
> between 25 and 26 before completing the profile?

Not really up on IJC, but this is a general problem with densitometers and spectrophotometers. They all read with the same 45 degree illuminant, 0 degree observer or visa-versa. It's a highly flawed model. Humans viewing a picture don't use anything even close.

I'm tinkering with multishot cameras and colormetric filters right now, trying to work out a more useful model, but I'm in over my head. I can see something's broken, but can't get a handle on fixing it...