QTR-Quadtone RIP

You have the basic idea.

If you run the values through Linearize-Data there are two lines. Use the one labeled for negs. All it does is reverse the order from white to black -- no inversion of values.

The software does the inversions.

Roy

On Saturday, October 12, 2013, wrote:

I am having trouble understanding the mechanics of this. Here is what I have done so far.

1. Inverted the 21 step gray scale linearization file.

2. Printed it on Pictorico.

3. Made a carbon step wedge print from the negative. Print has good tonal values, with paper white at 0%, and good reflective Dmax at 100%, with increasing values from Step 1 to Step 21.

4. Opened the Measuring Tool and scanned the positive step wedge print with the iOne. Everything went fine, but the L values returned (derived from the positive print, highlights to shadows) are inverted from what I need. They seem to work fine in linearizing the profile if inverted (which I did manually), but the software does not allow me to measure from shadows to highlights.

I am missing something in the work flow, but what? Is there a routine for just inverting the L values?

Sandy

---In quadtonerip@yahoogroups.com, <petebergstrom@...> wrote:

Great, Sandy. That's what I would be using as my work flow as well.

Pete

On Fri, Oct 11, 2013 at 2:53 PM, <sanking@...> wrote:

Hi Pete,

Yes, I have very good control of the alternative process in question, carbon transfer. With reasonable care I am able to repeat density values of a print with a fairly high level of accuracy. I have also been making digital negatives for a very long time with my ownt QTR profiles, but linearizing with Gray_Curve.

Any idea on whether the work flow is OK?

Sandy

---In quadtonerip@yahoogroups.com, wrote:

Is your command of the alternative process such that the results from a given input are repeatable?

Pete

On Fri, Oct 11, 2013 at 1:34 PM, <;sanking@...> wrote:

know how to make QTR profiles for printing with inkjet printers using the QTR tools, and I have learned how to linearize the profiles using the iOne spectrophotometer and the 21 step gray targets using the Measuring software..

What I would like to do is use the iOne and the 21 step gray targets and linearize a profile for digital negatives with an alternative printing process, but I am having trouble putting my mind around the procedures. Would the following procedure work?

1. Print a negative of the 21 step grey targets with the QTR digital negative profile, with no curve or linearize numbers in the profile.
2. Use the negative to make a print with the alternative process.
3. Read densities of the print with the iOne and the Measuring software.
4. Apply the linearize numbers generated to the QTR digital negatiive profile.

Sandy