Problem with QTR Linearize


#1

UPDATE:The 21 step.XL file works now on mac, so I re-entered the data and made a new .txt file. Now when I drop it and the .quad file to be modified onto the QTR-linearize app, it generates the -out.txt file and a quad-out.txt file, but no new .quad file. Attached are the .txt files in question.

thanks

I’ve successfully flushed and installed the PZ-DN carts in my 3800 and successfully printed images and step wedges. However, the stock curve is off more than I expected, so I followed the directions for printing and scanning a 21 step wedge, noting the vales in the Excel file, cutting and pasting the values from the CGATS page into a new excel file and saved it as a tab delimited text file. I’ve dragged both the new .txt file and the .quad file that I want to modify over the QTR-Linearize app, it clicks and whirs and creates a the new Quad-lin file and a -out.txt file, but the newly modified quad file isn’t recognized as a quad file. The mini icon to the left of the file name is blank. I’ve attached the .txt file, the -out.txt file, and the new non-working .quad file.


thanks,
jim

3880-PiezoDN-Pd-Ox-IJM.quad-out.txt (122 KB)

JT_Aug-30-Workbook2-out.txt (14.4 KB)

JT_Aug-30-Workbook2.txt (2.51 KB)


#2

Oh. Sorry, I see what you are doing. With the 21step scanner tool data, you pulled this over the wrong dropout. You want to pull the .quad and the .txt over the QTR-Linearize-Quad droplet, not the QTR-Linearize-Data droplet.

 

Best,

Walker


#3

Change the curve ending from .quad to .txt and upload


#4

I built a new .quad based on your linearization txt and installed it. (I just used some random .quad). It works perfectly. The only thing I can think is that your .quad has some character in its name that is messing up QTR.


#5

Hi Walker,

Attached are the original and modified quad files renames with txt suffixes.

thanks

jim

3880-PiezoDN-Pd-Ox-IJM-lin.txt (8.29 KB)

3880-PiezoDN-Pd-Ox-IJM.txt (10.4 KB)


#6

Installed the .quad. Works just fine.

 

Did you place this quad file inside of your curve folder and re-install the printer and see if it’s in the quadtone driver’s curve menu?

 

Walker


#7

Aha. I didn’t realize that the printer needed to be re-installed. I did that and the new curve now appears in the print dialog box. I went back and checked the deluxe manual on Page 86 that I referenced for this linearization process and I don’t see any mention of re=installing the printer. It might be a good addition to the next update.

thanks,

jim


#8

This is covered in the introduction to piezography and quadtonerip in the manual.


#9

Are you measuring the film and not the paper?

 

You seem to be trying to linearize your densities of film instead of the printed densities on a darkroom paper. Density is a LOG value so it should actually not me linear to make a good print, and anyway PiezoDN works off the printed densities in L* values.

This has tripped up a few people in the past. PiezoDN works off of printed darkroom patches, not film densities. In that way it’s incredibly more fine-tuned and also simple.

-Walker

 


#10

Hi Walker,

I just did it again onto the QTR-Linearize-Quad droplet and the same thing happened as when I originally wrote to you. The newly generated -lin.quad file does not appear to be legit. Attached are the text files in question. I can’t send you the new ,quad file as I get a message that it is not valid.

thanks,

jim

JT_Aug-30-Workbook2-1.txt (2.51 KB)

JT_Aug-30-Workbook2-out-1.txt (11.4 KB)