Digital BW, The Print

I have been working to create ICCs for several combinations of paper and ink that I am using. I have a question regarding the correct way to read the values off of a printed test step scale. 

My methodology has been to print a 21-step scale with the candidate ICC and then scan it using an Epson flat bed scanner. I then open the scan up in Photoshop and read the scales using the information panel. 

Recently, I began including a Kodak gray scale card along with my printed step scale in the scanner. When I read the values from the Kodak card in Photoshop they do not equal what they should be. 

My question is: Should I linearize the image using levels or curves so that the Kodak scale reads correctly before I begin reading my printed step scale? Would this correctly adjust for any off-set I may have in the scanning process?

See the StepWedge tool here: http://www.quadtonerip.com/html/QTRdownload.html

It's  the best way to go with a flatbed.

Paul
www.PaulRoark.com 

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "remononaz1" <homershannon@...> wrote:

>
> I have been working to create ICCs for several combinations of paper and ink that I am using. I have a question regarding the correct way to read the values off of a printed test step scale. 
> 
> My methodology has been to print a 21-step scale with the candidate ICC and then scan it using an Epson flat bed scanner. I then open the scan up in Photoshop and read the scales using the information panel. 
> 
> Recently, I began including a Kodak gray scale card along with my printed step scale in the scanner. When I read the values from the Kodak card in Photoshop they do not equal what they should be. 
> 
> My question is: Should I linearize the image using levels or curves so that the Kodak scale reads correctly before I begin reading my printed step scale? Would this correctly adjust for any off-set I may have in the scanning process?
>