QTR-Quadtone RIP

Hi Shilesh,

> I must say I have never ecountered posterization issues with customary inks
> that use K, LK, and LLK alone, or as backbone followed by LM, LC, and others
> for toning via use of "toner" or "copy curve from" in QTR ink setup.
>
Tomorrow I'll upload the section of the image that tends to posterise and
you can try for yourself :)
I'll email when its done. You might be surprised....

>
> I think Cone type overlap may (perhaps) be required when using 4+ gray
> inks, which in my opinion is at best an overkill, and technical mas@#$%^tion
> at worst. I have not seen a print that was better simply because it had 6 or
> 7 shades of gray. Try to reduce the number of gray inks in your set up, and
> use standard QTR curves design tools. I am curious what your eyes will see.
>
I don't think there's a particular reason why more overlap is required with
more inks, but maybe as the ink curves bunch more together. I think its more
about smoothing the tonal change in the inks sets, especially the splits.

But the one place that overlap is required with some papers is at dmax. Some
papers require both #1 and #2 ink densities to reach dmax, maybe 30 on the
QTR graph scale for #2 ink, Canson Photorag is such a paper. With #1 ink
only you achieve at best approx L= 1.0 less. On the other hand on other
papers such as Epson Hot Press Bright, dmax can be achieved easiest without
any #2 ink @ dmax.

Mike


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