RE: Re: Digital Negative Etiology

As far as I know, most gum printers, if not all, use Adobe Photoshop.
It's relatively easy to use and works well - you can do RGB or CMYK or
even duotone separations from a colour file, and duotone from a B7W file
too.
Kate

-----Original Message-----
From: res1dvao@verizon.net [mailto:res1dvao@verizon.net]
Sent: Tuesday, 1 March 2005 5:47 a.m.
To: alt-photo-process-l@sask.usask.ca
Subject: Re: Re: Digital Negative Etiology

I did find one program that made color seperations for t-shirt printers
that cost $995.00. (How many t-shirts do you have to sell to pay for
that) I got a trial copy and found it was difficult to use. Hoping for
something better, faster, smaller, cheaper, etc.

George
>
> From: Dave Soemarko <fotodave@dsoemarko.us>
> Date: 2005/02/28 Mon PM 04:14:11 GMT
> To: alt-photo-process-l@sask.usask.ca
> Subject: Re: Re: Digital Negative Etiology
>
> If you need color accuracy, Photoshop is the best about five years
> ago. My
> work at one time was very related to digital imaging, so I know that
you
> could find a new technical article in imaging science in a technical
> journal, for example, and soon you could find Photoshop implementing
it.
> They never revealed their exact algorithm, of course, you could tell
by the
> terminologies they used (and things like 27x27x27 matrix).
>
> Now that five years have passed and imaging science, as applied to
> photography, has more or less mature, maybe some other imaging
software like
> Corel's PhotoPaint might have the same separation algorithm, but I
haven't
> followed closely lately.
>
> Of course one still needs to have some technical knowledge in color
> separation, ink sets, balancing, etc. to produce good separation, but
given
> that silk screening is also a commercial process, you might be able to
find
> better references/resources in this area even though your application
might
> be in fine arts.
>
>
> Dave S
>
> ----- Original Message -----
> From: <res1dvao@verizon.net>
> To: <alt-photo-process-l@sask.usask.ca>
> Sent: Monday, February 28, 2005 10:32 AM
> Subject: Re: Re: Digital Negative Etiology
>
>
> > If you are doing color seperation what program are you using? I
> > want to
> > do some serigraphs and color seperation is the weak link in the
process.
> >
> > George
> >>
> >> From: Dave Soemarko <fotodave@dsoemarko.us>
> >> Date: 2005/02/28 Mon PM 12:40:43 GMT
> >> To: alt-photo-process-l@sask.usask.ca
> >> Subject: Re: Digital Negative Etiology
> >>
> >> It went long long time back, so I don't think we can really trace
> >> it
> >> back.
> >>
> >> When people use halftone screen to make negative and contact prints

> >> to
> >> make
> >> plates for printing, they were using digital negatives. Although
they did
> >> not use computer or imagesetter to produce the negatives, the
negatives
> >> were
> >> in fact digital (or more accurately, binary). The use of computers
make
> >> the
> >> process simpler and quicker, but there is nothing really new about
it.
> >> Just
> >> like when people created computer software to do accounting, they
did not
> >> invent anything new in the field of accounting itself, but they did
make
> >> accouting simpler and faster, of course.
> >>
> >> One might say that is not alternative process as we are discussing,

> >> but
> >> the
> >> principle is the same. Note that in platemaking (in the earlier
type and
> >> some current ones too), the plates were coated with gum arabic, you

> >> expose
> >> it with UV light, then you wash out the unexposed area, etc. If
instead
> >> of
> >> using metal plates, you use paper as the base, you have gum
bichromate
> >> prints, in principle.
> >>
> >> Digital color separation, however, can be considered something new.

> >> This
> >> is
> >> because in the traditional 4-mask or 12-mask system, you still
cannot
> >> completely color correct the whole gamut. In digital color
separation,
> >> the
> >> process is not simply speeding up the 12-mask system, for example.
It is
> >> actually using numerical analysis and interpolation algorithm to do
color
> >> characterization and to create the separation, so technically it
can be
> >> considered different or new.
> >>
> >>
> >> Dave S
> >>
> >> ----- Original Message -----
> >> From: "PhotoGecko Austin" <gecko@photogecko.com>
> >> To: <alt-photo-process-l@sask.usask.ca>
> >> Sent: Monday, February 28, 2005 3:02 AM
> >> Subject: Digital Negative Etiology
> >>
> >>
> >> > Greetings all,
> >> >
> >> > Just a late night rambling curiosity (. . . but these things
> >> > matter,
> >> > don't
> >> > they? -- otherwise there would be no OED): Who first (according
to
> >> > reliable objective sources) came up with the idea of making
digital
> >> > negatives for contact printing on whatever strata? Can anyone
on the
> >> > list trace it back. . . . ?
> >> >
> >> > (Note to D.B.: If you claim this you'll need LOTS of witnesses.)
> >> >
> >> > It just occurred to me (while politely cajoling a few
> >> > transparencies)
> >> > that
> >> > I should know. But I don't have a clue.
> >> >
> >> > Curious minds want to throw.
> >> >
> >> > I hope you are all well and prosperous,
> >> > John
> >> > __________________________
> >> > John Campbell
> >> > PhotoGecko Studios & Gallery
> >> > 1413 South First Street
> >> > Austin, Tx 78704
> >> > (512) 797-9375
> >> >
> >> > www.photogecko.com
> >> >
> >> >
> >> >
> >>
> >>
> >>
> >
> >
> >
>
>
>

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