Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Carl 
Schofield <scho@m...> wrote:
> Phil,
> 
> I just put a screen grab of the IJC linearization window up on 
my 
> filesharing website.  This image (IJC.jpg) shows the target and 
> measured density values used to linearize the cool EAM profile 
and the 
> curves illustrate the "fit" to the AIM target values.  Hope this is 
> helpful to you.  As I noted the densitometer I used does not 
conform to 
> ANSI standards and was only calibrated against a Kodak Q-13 
target for 
> the nominal AIM values.  You can view/download the info here:
> http://homepage.mac.com/scho/FileSharing2.html

Carl,
Thanks for posting that. It's quite interesting (and entirely 
foruitous) that our two different, uncalibrated densitometers 
seem to have given very similar density readings along the entire 
grayscale (i.e., comparing your data  to my OPM 1.02 stepwedge 
data). The 100% black patch shows the largest difference (-0.04) 
and that is where my streaking problem shows up. However, the 
densitometry on my 1.02b5 stepwedge differs 
significantly from these previous curves, indicating that 
somehow the 
recent b5 version has unlinearized (delinearized?) the profile. 
Output from both OPM versions (my data) can be seen in this 
link:
http://phil-rose.com/miscellaneous/1.02_vs_1.02b5.jpg

Phil
P.S. I'm embarrassed to admit that the borrowed X-Rite I used 
(at the printing shop where my son works) was covered with 
talcum dust and presumably hadn't been calibrated in 
months/years. In any case, the control test-strip I measured 
yesterday agreed to within +/- 0.01 at all points with the values 
from a week ago. So, accuracy very questionable; precision not 
too bad.