Is a Mac really required for piezoDN?


#1

In Section 12 of The Piezography Manual 2016 Deluxe Edition, I see on p. 105 that one of the requirements is to “Use a Macintosh Computer.” As a Windows user, I wish I’d known that before I bought a printer, inks, QTR, and piezoDN.

In a recent workshop I attended, where I had my introduction to piezography and piezoDN, I got the impression that you needed a Mac to make ICC profiles, but that profiles were optional.

Anyway, please reassure me that I can make great curves with my Windows machine. If Mac is indeed optional, then perhaps the wording “Use a Macintosh Computer” should be changed to something that would be less alarming to us Windows users.


#2

You’re fine. With a Windows machine it forces you to print linear so you will need to soft-proof with the Default PtPd ICC with Preserve RGB Numbers turned on to simulate this linear environment on your screen before printing.

 

best,

Walker


#3

Whew! Thanks.


#4

I made my first print today: a digital negative, using the base Cyanotype .quad curve. I opened an image in Photoshop, flipped horizontal, inverted, flattened, converted to Grayscale Gamma 2.2, scaled to print size at 720 ppi, and saved as tif. I printed it from QTRGui on Windows (see screenshot). I got a nice looking negative, but on second glance, I realized I had printed a positive!

Does QTRGui invert the image? I know Print-Tool inverts, but I thought I would have to do it myself when using QTRGui.

 


#5

You need to read the chapter on PiezoDN in the Deluxe Manual pdf.

best,

Walker


#6

It’s funny you should mention that. I carefully re-read chapter 12 of the manual this afternoon before printing the negative. Section G (“Print! Print! Print”) talks about printing from Print-Tool. I already knew that it was unnecessary to invert an image when printing from Print-Tool because I had used Print-Tool in a workshop. But now I’m home and printing from QTRGui.

But it’s obvious from my “experiment” that the image is being re-inverted, so I guess I really didn’t need to ask the question.

Maybe the manual should say “the .quad curve takes care of the inversion.”


#7

Right in the first paragraph where it says “What is PiezoDN?” it says this, as well as elsewhere.

What is PiezoDN?

… There is no need to build custom Photoshop calibration curves or to even invert the image before printing…


best,

Walker


#8

I have an interesting Windows dilemma. To linearize a quad, I need to print a target. To print a target, I need Print-Tool (QTRGui does not have a “no color management” option). Print-Tool only runs on Mac.

So I see that a Mac is needed for even the most mundane tasks.


#9

QTRgui is No Color Management by default. It has no place for a profile. This is covered in the Printing chapter.

 

best,

Walker


#10

That’s good news. So I will be able to use QTRGui after all. I was thrown off by the statement on p. 110

Print the 129 step target file using your .quad of choice (either a pre-calibrated .quad or a custom limited master .quad). You need to use Print-Tool for this. Make sure to select “no color management” at the bottom right before you print.