Message
Re: New User Guide
2014-11-16 by paulmwhiting@...
Let me join the others and say "bravo" for taking this on.
With the off-line help of a member here, I'm using a technique which he developed with some success. Maybe you're already including this, but if not I'd be happy to describe it to you. You'll be using a flatbed scanner and Photoshop, even Elements will do. Here's a very rough outline of the linearization procedure:
You start with a Kodak greyscale, call up a scan of it in Photoshop, and with the eyedropper get an rgb readout of each step. Then enter these in Open Office Calc (or Excel, I used Calc because it's free!) in one column and the Densities as printed on the greyscale in another column. In Calc, create a curve and right click on the trend line and you will obtain a logarithmic curve for the curve. No need to understand logarithms, Calc will crunch the numbers for you.
Next print the 21 step file supplied in the QTR download using the inkset you are linearizing, and make a note of those rgb values. Expand the column of densities to include values between the 20 steps. Using that logarithmic equation at the top of rgb column you can then generate the densities for how your printer reads those 20 grey scale steps. The last step is to enter those densities in the final step of QTR.
This is very sketchy, I'm simply trying to outline it for you to ask if you have anything like this in your book-in-progress. I haven't linearized for a few months and I'm a little fuzzy on the details. I've recently mixed a new batch for the 2% black cartridge and I would benefit from retuning my curve. Going through the process again I'll be able to make this description more complete and comprehensible. (Am using Paul's Eboni-6 inkset but mixing my own inks using his Carbon-6 method.)
I hope this is of interest... it's easier than it looks!
Paul