Re: Trident 4
Re: Trident 4
- Subject: Re: Trident 4
- From: neilB <email@hidden>
- Date: Wed, 22 Nov 2000 11:26:44 +0000
Hi Neil
On 22/11/00 at 9:20 am, email@hidden (neil snape) wrote:
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neilbarstow wrote:
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> Anyone else out there having trouble profiling a scanner with
>
> Howtek's Trident 4 ?
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Okay I've seen this posted on the scanner list. I almost bought a Howtek
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thinking that with Trident an ICC workflow was possible. Is it?
yes, but only up to the point of screen preview right now. The
"export to workingspace" option appears to be broken at present, a
fix has been promised. For the moment profile to profile in
Photoshop is not a large price to pay for 16 bit profiled files I feel.
My Howtek 4000 is old but very good I think. And Trident is a
nice SW to use, even with my reservations about preview below.
>
Why should your mappings in the end points be restricted to preset values?
I'm not quite sure what you mean. I'd like to be able to set the
endpoint numbers myself before scanning the IT8 so I do the scan
"manually" , saving the settings for future scans using the
resulting profile. I am told that IPB tells the user to ensure
the IT8 scan is clear of the 0 and 255 points before running a
profile.
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Why are you trying to apply curves to a profile?
mm - I am actually applying curves to the generation of a profile
- because-
I am I am compelled to scan the IT8 manually since IPB does not
like the IT8 scan saved from Trident's "input icc calibration"
routine.
The manual IT8 scan requires either accepting the default Trident
curve [which makes the IT8 too light] or a tweak can be applied
and saved.
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Why do you think the rgb values should be neutral for a Kodak IT8
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transparency?
well - I think they should be close to neutral since the IT8 film
`"looks" neutral. Once I have made a profile, I open the IT8 file
[the one used to make the profile] in Photoshop, converting to my
workingspace from the new profile. Now I get almost exactly
neutral numbers in the grayscale 127/126/126. This means that
since the Kodak SW is providing a profile which corrects the IT8
values to where the IT8 data file says they should be - the
target must actually be almost exactly neutral.
>
Why do you want to click on colour cast corrections before profiling?
If I apply a profile made as above [no cast corrections] in the
Trident SW's RGB blowback dialog [a version of display using
monitor compensation]. I get really messed up numbers in the
preview. Like I said previously, it's as if Trident is now
measuring the numbers as if the preview is if in scanner space,
which I suppose it is in a way.
Ideally, I think the profile should only be used for the preview
at this stage - allowing the use of RGB numbers which accurately
predict the final image after the P>P into Photshop. So a mid
gray would read 129/129/129
Say I want to neutralise a film based cast in an original I'm scanning,
perhaps the sun was a little too warm for that neutral mid gray
jacket, well, I'd like to be able to either use the cast correction
eyedroppers or at least check I have a neutral by the numbers.
Since, with my profile loaded for screen preview, Trident now
enumerates a neutral gray at 138/118/110 my numerical guidelines
are wacked.
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Also Steve Upton replied about the rendering intent. Isn't rendering intent
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for a scanner profile always perceptual?
maybe the built in conversions within scanner SW would be, you
got me on that one? I'm converting P>P into my Photoshop
workingspace, perhaps he intends me to use relative Colorimetric
for that conversion.
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>
Sounds very complicated up to the point of being unusable.
well, no, I got it dialed now, I just want the "export to
workingspace" to operate as expected. Plus I'd prefer not to have
to use two different profiles, one for originals which require
cast correction by the numbers and one for those in which cast
correction would be a mistake [eg. sunsets?]
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The implementation of ICC through Linocolor is about as easy as
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it gets per ICC workflows go.
so you can see an accurate screen preview [accurate to the image
appearance once in Photoshop that is], make the colour and tonal
edits you want in the Linocolor SW, and then output to your
chosen Photoshop workingspace with your user edits concatenated
with the profile to profile conversion during the scan?
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Unfortunately for the Mac user's
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(most of us on this list) we'll have to wait for 16 bit saved filed
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that are already shipping with Newcolor. This workflow includes all
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16 bit colour corrections transforms etc and screen previews.
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Almost makes me want to get a PC just to scan on (* and of course
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most Rips are server based PC).
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--
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Neil Snape in Paris
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Neil Barstow
phone: 44 (0) 1273 774 704 fax: 44 (0) 1273 323 454
mobile: 44 (0) 77 78 16 02 01