QTR-Quadtone RIP

Hi... can't find a way around this issue, and hoping someone here can help.

The problem: PS CS6 filters out the Gray Gamma 2.2 icc profile as a print option. 

The issue:
Piezography inks -require- that the printer setting be 1) Photoshop manages colors and 2) profile - gray gamma 2.2. (This matches the document itself, and sends it thru unchanged.)

I've tried hacking into the profile and changing the code from mntr to prtr, but that didn't work.

Does anyone have an -output- gray gamma 2.2 profile that CS6 will include in its list, or any other solution to this issue? 

As it stands now, one cannot follow the Piezography workflow instructions and print from PS CS 6.

Did you set the gray gamma 2.2 in the preferrences?

--- In QuadtoneRIP@yahoogroups.com, "tvalleau" <tracy@...> wrote:

>
> Hi... can't find a way around this issue, and hoping someone here can help.
> 
> The problem: PS CS6 filters out the Gray Gamma 2.2 icc profile as a print option. 
> 
> The issue:
> Piezography inks -require- that the printer setting be 1) Photoshop manages colors and 2) profile - gray gamma 2.2. (This matches the document itself, and sends it thru unchanged.)
> 
> I've tried hacking into the profile and changing the code from mntr to prtr, but that didn't work.
> 
> Does anyone have an -output- gray gamma 2.2 profile that CS6 will include in its list, or any other solution to this issue? 
> 
> As it stands now, one cannot follow the Piezography workflow instructions and print from PS CS 6.
>

--- In QuadtoneRIP@yahoogroups.com, "Keith" <kjrslr@...> wrote:
>
> Did you set the gray gamma 2.2 in the preferrences?
> 

Hi Keith

Yes indeed. The issue is that CS6 has intentionally removed the possibility of using the same profile as the document to print, and further will not show the gray gamma 2.2 profile. Adobe has touted both these as "features." (There is some discussion right now on both the Adobe and the Piezography forums... I've kicked up a bit of a hornet's nest with this discovery.)

That said, I've also discovered the solution, and posted it both places last night.  I just ran out of energy and went to bed, or you'd have see it here.

That said, here's the solution, near as I can tell:


1) change the printer dialog from "photoshop manages colors" to "printer manages colors" and

2) in the driver dialog (print settings), under Color matching, choose QuadToneRIP instead of Colorsync.

Thanks again!

Tracy

I'm afraid I jumped the gun last night. While I was getting nice images out using "printer manages color" and QTR for color matching, after printing several new tests this morning, I'm not seeing the effect of any of the curves using this technique. 

That is, regardless of the curve selected for the QTR, the image is identical. So... back to the drawing board.

Sigh.

I tried Adobe Color Print Utility, but it just crashes with error -2582.

I'm afraid right now that using CS5 is the only way I can find to continue using Piezography.

Someone please prove me wrong!  I'd really like to use PS CS6.

Here's a version of the null-transform that does seem to work for Piezography, (which is concerned only with maintaining the 2.2 gamma, and not any colors) courtesy of Jon Cone:


(I had tried converting to sRGB this weekend, but whatever I chose for a printer profile was not accepted. I did not try Wide Gamut, and that's what worked.)

So: 

1) work in Gray Gamma 2.2;
2) convert image to sRGB;
3) choose "Photoshop manages colors"
4) choose "Wide Gamut RGB" as the printer profile

all else as usual.

I ran a couple of prints this morning testing this, and eye-balling the output (compared to known good test prints done thru CS5) it looks correct, and as expected.