Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@y..., Todd Flashner <tflash@e...> 
wrote:
> Maybe you guys should use the same image for your tests, like a step 
wedge
> from this lists files?

This sounds like a good idea, standardize. Where I'm coming from is 
panic mode,this "test image" I've been using is a real print I was 
trying to get ready for a show. So naturally, I wanted to get the 
thing right so I could go on to frame it, etc as well as some other 
images. Last night in PS 6 I reprinted everything except for one or 
two images, and I can do those today.

Anyway, not having done any step wedges for this problem yet, I don't 
know how visible it would be. I suspect I would see an increased  
density change value somewhere along 70-80%k for PS 7, and maybe the 
50%k patch would look a tiny bit lighter in PS 7- but this last would 
be barely perceptable. Since I can see a definite change in my "test 
print" I know something is going on. If I can get to test wedges I 
will, at the moment I need to catch up on some other stuff.

> 
> Are you all using the same operating systems?

Win98SE for me.

 Do they all implement 
color
> management similarly?

That's what I've been trying to nail down. I've been using Adobe ACE, 
relative colometric for one example. And I think I have everything 
else the same now. Folks have been checking me out on this latter 
point.

 in PS are you all using the same color engine 
for your
> conversions, do you all have black point compensation checked

yes, checked.

 (or 
not) and
> dither checked

yes, checked.

 (or not) and are they all set up the same for both PS 
6 & 7?


Unfortunately, there are no discrepancies here that I can see. In the 
color management dialouge for BOTH 6 and 7 I chose "Photoshop 5 
defaults". I examined the advanced dialouge box for both 6 and 7 and 
rechecked over and over 5 or 6 times now that every choice was 
duplicated in each version.

One possible thing I did not check fully is that my image had three 
layers to it, and I converted to sRGB in one step. That is, I did not 
manually invoke the flatten image commend. When I seleted change mode 
to sRGB, a dialogue pops up asking if I want to merge image first, and 
I always chose "yes". I did this in both 6 and ver 7. It still creates 
a discrepancy since I did the step the same way in both versions, but 
does not remove it as a possible cause (ie if I flattened image first, 
would the change from 6 to 7 go away).
Jim H.


> 
> Todd
>