Digital BW, The Print

The qacvraw program only works with special .RAW files that Roy created 
while qacv works with Photoshop .ACV curves.

The qacv program will output the curve points of the first channel in a 
Photoshop curve as a set of x,y coordinates. Then you can use the qcurve 
program to transform these coordinates into 256 16bit values. These 
values can be used for one ink channel in QTR.

In the latest, not yet released, version of QuadProfile and QTRgui we 
support loading a Photoshop curve for any individual ink channel. If the 
Photoshop curve has more than one channel the first will be used and the 
others discarded.

If you wanted to you could create a curve for every ink channel and 
effectively bypass the entire profiling process in QTR and have full 
manual control of every ink channel. A more reasonable approach would 
perhaps to use this for special curves like GLOP curves where the curve 
for the GLOP ink might have an unusual shape and you'd want full manual 
control.

You can also load a photoshop curve to modify a partitioned gray or 
toner curve. This has always been supported.

In addition to this you can manually enter curve points directly into 
QTRgui instead of using the photoshop file format. Up to 50 curve points 
  are supported.

This works for all printers, the only difference is the amount of ink 
channels you have available to work with.

--
Daniel Staver
http://daniel.staver.no

> Appendix 2 of Tom Moore's very useful Tutorial on making curves for QTR
> says, "quacvraw is a way to convert a photoshop curve into a QuadToneRIP
> curve.
> 
> How do these work?
> 
> What kinds of Photoshop curves are covered?
> 
> Does it work for all Epson printers?  Hextone included?