Digital BW, The Print

Todd, can you get consistently perfectly registered prints if the paper gap is tight enough?

J




Todd Flashner wrote:

> One more thing. This means some of those old papers, which failed on the
> blacks, might have new life.
>
> Todd
>
> > Here I go, answering myself, as usual. Okay, after I wrote the stuff below I
> > happened two print two grayscales which overlapped, and sure enough, max
> > black was denser where the two overlapped. So I tried it on an image that
> > has some large black expanses - the one I used for the first piezo exchange
> > in fact. Yes, rather noticeable difference.
> >
> > Ya hearin' me Jerry? BLACKER BLACKS! Perfect registration on my 1160 with
> > the paper guide set just snug.
> >
> > It's all in the right mask. Where you allow the overprint to cut off, and
> > curtail spill-over into unwanted areas. I happen to like masks, but for
> > those who don't, but like good blacks, this might be reason enough to pull
> > that PS book off the shelf for review. ;-)
> >
> > Todd
> >
> >
> >> Well, I got the feeling if the print were being back-lit the extra density
> >> would have made a difference, but once enough is put down to be opaque over
> >> the paper, the only way at that point to increase depth would be to add
> >> gloss, to change it's reflectivity. What was happening in my case was that
> >> the more tones of "black" I included in my image, the more they blocked up,
> >> and detail was lost, yet just hitting the true blacks with a second pass was
> >> too minimal to matter.
> >>
> >>
> >>> Todd, I've also noticed that SOME times you can indeed get a perfect
> >>> registration. I couldn't hardly believe it. It sure is odd you didn't
> >>> get any denser blacks with a second pass. Guess the ink was really black,
> >>> no?
> >>>
> >>> J
> >>
> >>>
> >>> Todd Flashner wrote:
> >>>
> >>>> Regarding multiple passes of the same sheet on a press, I did try running a
> >>>> print through my 1160 twice to try to lay down a denser black. First I ran
> >>>> the print through as normal, then I made a mask which allowed for printing
> >>>> only of the lower values of the print. I wanted to leave the mid tones and
> >>>> highlights alone on the 2nd pass, but double up the blacks. Good news and
> >>>> bad. Good: perfect registration (if anyone is going to try this I recommend
> >>>> you do immediately successive passes on the same printer, so that the paper
> >>>> guide and everything is exactly as it was on the first pass. Bad: no
> >>>> visible
> >>>> density difference. Now if I did two passes over the entirety of the print
> >>>> it'd double the density, and the whole print would be (was) a stop darker,
> >>>> but by just doubling up the blacks *I* did not see the benefit.
> >>>>
> >>>> Oh well...
> >>>>
> >>>> Now, if you could/can get exact registration on two printers you could do
> >>>> some very interesting toning effects by printing colors over quads, for
> >>>> instance. Not that any one should want to, but it does make for some
> >>>> interesting possibilities.
> >>>>
> >>>> Todd
>
>
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