QTR-Quadtone RIP

As shown here glop presents an inherent problem.  By the time QTR sees the
page and applies the curves there's no way to distinguish the white of the
border from the white of an image.  There is no ideal solution without a lot
of changes.  So I've taken the 'least-bad" approach of zeroing the
pure-white
entry of the glop curve allowing the margins to be glop-free.  Therefore
this
requires you to limit your image to a value of 254 instead of 255.  This is
easily
done in Adj Levels -- set the Output slider to 0...254.

Roy


On Dec 13, 2007 1:18 AM, Olivier <odesmais@...> wrote:

> > Using a text editor, I opened the .quad file that the curve
> creation
> > tool output, and I looked at the gloss optimizer section.  Lo and
> > behold, the first value in that section is zero. I manually changed
> > it to be equal to the second value... and voila, I get full
> coverage
> > of gloss optimizer on the pure-white areas of the page!
> >
> > Incidentally, this isn't a perfect solution, because now the entire
> > white space on the page gets a 30% coat of glop... not just the
> > white space within the image boundaries.  Fine for an 8x10, not so
> > economical when printing a smaller image.
> >
> > So it looks like this is just a minor bug in the curve creation
> tool.
> >
>
> I'm soon on for Piezo MPS with the infamous GLOP.
> I think I understand was is said here, yet not completely. I open
> R800_F-A-Pearl_2880_warm_glop_v10.quad in text, couple of questions :
>
> 1. Quad txt shows for an ink position (say PK) a 0-255 scale. I
> assume this is ink value not RVB value so that 0 is no ink 255 is
> full ink (would make sense for a rip) ?
> 2. Out-value seems to be 16b (0-65536) ? PK in the above quad reaches
> below 65536 for TIL purpose most likely.
> 3. My understanding is that there's still an issue for all white
> areas get a spray of GLOP, not much convenient. The idea of applying
> a PS curve to limit the image range to 0-254 is the only work-around ?
>
> Thanks for helping...and possibly saving me time and consumable cost.
> Olivier
>
>
>
>
> Yahoo! Groups Links
>
>
>
>


[Non-text portions of this message have been removed]