RE: Re: Digital Negative Etiology

I know you can do three and four color seperations with Photoshop but the program I refered to did up to 9 color seperations. How do some printers end up with 20-30 screens for their prints?

George
>
> From: Kate M <kateb@paradise.net.nz>
> Date: 2005/02/28 Mon PM 07:02:49 GMT
> To: alt-photo-process-l@sask.usask.ca
> Subject: RE: Re: Digital Negative Etiology
>
> On second thoughts, maybe Photoshop Elements does this too...anyone
> know????
>
> -----Original Message-----
> From: Dave Soemarko [mailto:fotodave@dsoemarko.us]
> Sent: Tuesday, 1 March 2005 6:01 a.m.
> To: alt-photo-process-l@sask.usask.ca
> Subject: Re: Re: Digital Negative Etiology
>
>
> I don't think it is worth it. If it is for that price, you should get
> Photoshop because it is not just better in terms of ease of use or
> feature
> or that type of things, but the color model and math are actually
> better.
>
> If you want something less expensive, perhaps Corel's PhotoPaint will
> do.
> They were at one point trying to compete with Photoshop, so they might
> be
> competing in color model also.
>
> Dave
>
> ----- Original Message -----
> From: <res1dvao@verizon.net>
> To: <alt-photo-process-l@sask.usask.ca>
> Sent: Monday, February 28, 2005 11:46 AM
> 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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Received on Mon Feb 28 13:11:11 2005