From: Thor Bols (thorbols@hotmail.com)
Date: 11/05/00-03:23:15 PM Z
Regarding your statement: "One thing that I want to add to
this is that if you are using shades of black ink (in my case 25, 50, 75 &
100% blacks) all bets are off on any curve found on the CD from Dan B's
book."
There is no reason why the same curves should not work with Multitone
inksets and conventional CMYK inksets. The problem you experienced is
likely do to an improper ink profiles. Considerable tweaking with
File/Color Settings/CMYK Setup is usually necessary in order to achieve
success with any Quadtone/Hextone printer.
>From: Nick Makris <nick@mcn.org>
>Reply-To: alt-photo-process-l@sask.usask.ca
>To: Alt Photo <alt-photo-process-l@usask.ca>
>Subject: Re: inkjet negs?
>Date: Sun, 05 Nov 2000 12:20:49 -0800
>
>Mark, I was think about this thread and it occurred to me that the post
>below that I made in July is relevant here. One thing that I want to add
>to
>this is that if you are using shades of black ink (in my case 25, 50, 75 &
>100% blacks) all bets are off on any curve found on the CD from Dan B's
>book. It took me some time to figure out why I couldn't make it work.
>
>Also, I have found success with Epson's Backlight Film - you must have the
>correct settings for your printer. Don't recall which one you have,
>however
>for the Epson 1520, I lie to the printer about the paper like Dan says and
>print with Microweave set to "Super", Ink set to "Color", High Speed "Off"
>and Print Quality set to "Superfne - 1440 dpi". As I indicate below, 360
>dpi prints best - I have it on my list to try a 720 and 1440 scan. Soon
>maybe???
>
>Nick
>
>BTW, I have an extensive collection of posts about Digital negs that I
>could
>forward to you as attachments to a single email.
>
>
>
>----- Original Message -----
>From: "Nick Makris" <nick@mcn.org>
>To: "Alt Photo" <alt-photo-process-l@usask.ca>
>Sent: Tuesday, July 11, 2000 8:11 AM
>Subject: Digital Pt/Pd tones continued
>
>
> > Just finished running some tests with a particular image from Photoshop
> > v5.02 to Epson 1520 (1440dpi). The tests included two versions of the
>same
> > file, one scanned at 410dpi (the most recent) and one at 360dpi - the
>more
> > recent one and this test were done on the heels of the recent discussion
>on
> > tones. Please understand that my printer is equipped with a Quadtone
>inkset
> > with a standard black ink and with the color inks replaced with 25%, 50%
>&
> > 75% black inks.
> >
> > You may recall that I discovered, now from two sources, and previously
> > reported, that the Epson 1440 dpi printers don't print images with
> > resolutions greater than 360dpi as well as those at 360. The problem
> > extends from the idea that above 360dpi a certain amount of resampling
>is
> > done by the printer, which causes results that are unpredictable. In
>this
> > case, all the images I printed from the 410dpi source showed some sign
>of
> > posterization while the 360dpi source produced no signs of posteriztion,
> > except as noted below. In addition, the 410dpi file caused the print
>time
> > to double +/-. The resampling surely has something to do with the
>printer's
> > processing algorithm and the coincidental association of 1440(printer
> > resolution)/4(cmyk?)=360???.
> >
> > Some additional observations that came from the 20 8X10 images I printed
> > (most printed on satin inkjet (94 brightness) paper, but some on bond
>for
> > comparison):
> > a.. The smoother the paper surface, less posterization and the better
>the
> > definition.
> > b.. The brighter the paper brightness index the cleaner the
>highlights.
> > c.. A simple conversion to grayscale produced posterization where the
>use
> > of Lab color mode did not in most cases.
> > d.. The use of color images never printed as cleanly as with Lab mode
>-
> > remember that I'm using quadtone inks.
> > e.. The use of strictly black and white color did not produce an image
>as
> > clean as those produced with a slight sepia toning.
> > f.. I NEVER EXPERIENCED ANY ON SCREEN POSTERIATION WITH ANY OF THE
>TEST
> > IMAGES. I feel this suggests the culprit, in most posterization
>problems,
> > is related to how the printer reacts to the input. Can't be sure of
>that.
> > I don't pretend to fully understand why I experienced the above, but for
> > what it's worth.....
> >
> > I have developed/refined a Photoshop "Action" that will convert any
>color
> > image (from a point that you think it looks best) to Lab Color, delete
>the
> > appropriate channels, apply grayscale, a sepia tone, and convert it back
>to
> > RGB so that it looks like a sepia toned grayscale image. BTW, I never
>save
> > my files after this conversion - it only takes a few seconds to
>complete.
>I
> > also have a Pt/Pd curve that I think works for both the Lightjet 5000
>and
> > the Epson 1520 with quadtone inks. I am happy to provide them to anyone
>who
> > asks off list.
> >
> > Also, as I have previously reported, no curve that I encountered during
>the
> > last year and half (since I started this digital project) works with the
> > above. The curve that I developed is a very straight forward (gentle
>'S')
> > one that only gives the appearance of added contrast to the on screen
>image
> > and also to the printed output. You may be required to change it so
>that
> > the resulting prints (negs) conform to a density and contrast compatible
> > with 'YOUR' normal sensitizer. The unsuccessful curves that I tested
>all
> > seemed destined for output to an Imagesetter which apparently responds
> > differently???
> >
> > BTW, all the above tests/observations were done with a positive output.
> > However, I have tested the conversion to a negative and the results are
> > identical. The negative conversion is the last step before printing and
>can
> > be accomplished in the printer dialog box or on the Image menu.
> >
> > Caveat Emptor.
> >
> > Nick
> >
> >
> >
>
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