On Fri, Feb 2, 2024 at 08:48 AM, Eric Levert wrote:
Thank you for answering!
Just to be sure:
I print DTP on Toyobo-plates using QTR and PrintTool.
And for that you only use Matte Black isn’t it?
I really don't know any details about the DTP process and what's needed.
In general I'd think anything that can take Matte Black can take any other ink as well.
(Is the issue: just use Matte vs the Photo Black)
The thing is, I only see it in the, let’s say, 50-70% black parts.
It's all a matter of patterns that our brains can recognize. Less ink and there's less pattern to see.
More ink and more dots run together.
It's best to read up or get in contact with others who already do this process.
Roy
Eric
de Liefde 16
1052MZ-Amsterdam
@eric1levert
www.eric-levert-etsen.nl
Op 2 feb. 2024, om 02:54 heeft Roy Harrington <roy@...> het
volgende geschreven:
Eric,
Looking at your original images the bands look approximately 1inch apart
which is the head size.
So my guess is that you are seeing the variation of the inkjets -- probably
normal manufacturing tolerances.
The close bands at the top of a print are likely because the reads have to
make closer passes over the paper there.
The way this is normally avoided (actually hidden) is using lots of
different jets scattered seemingly randomly.
The interleaving of passes helps a lot but also using more different inks
helps a lot. When you mentioned using
only one ink this suggests to me you are using lots less different jets.
You've said the Epson driver is better
and its because it uses lots of different inks -- grays as well as all the
colors. This gives smoother results but
may not be the inks you want. Of course this is the advantage of QTR -- you
get control of the inks.
But you still have to use several inks to hide banding. I don't do
negatives in general but most curve-profiles I've
seen use many inks with the same curve shape. For instance Y is ordinarily
not very dense but to UV light it is
quite dense. So try adding inks -- reduce MK and increase others. You
ought to have tested the different inks
for UV density previously.
Roy
