Re: help with camera profiling
Re: help with camera profiling
- Subject: Re: help with camera profiling
- From: Roger Breton <email@hidden>
- Date: Thu, 31 Oct 2002 08:08:19 -0500
Q1: That's a sound approach and it should work, IMO. Even though there is
no such thing as a "grayscale" camera profile (yet) ColorSynergy allows you
to create a grayscale sscanner profile. That would require a custom
grayscale IT8.7/x to exist. You could build such an animal out of paint
chips that would have to layout in an IT8.7/x format for you to shoot with
your digital camera, and you'd have to create the reference file.
ColorSynergy won't know where the files come from and should honor them.
Q2: I think the camera's built-in electronics will compress the input scene
luminance range to always the same output scene digital range. No matter
what the source scene is whether it is a landscape or a matte paper target
like the Macbeth ColorChecker. What we're after is the response of the
camera to the input scene luminances.
That's my two cents. I'm far from being an authority on this.
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Hi there List Members
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I am hoping you can help me.
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I am working with a photographer, he is shooting on black and white film and
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I am scanning his negatives and printing them on black and white inkjet for
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exhibition.
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I am experimenting with creating a 'film camera profile' in my digital
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workflow for my photographer friend's camera and film combination.
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My intention is to get scans with a more linear compression of tones relative
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to the original scene he was shooting. (i.e. minus the tone compression of the
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film characteristic curve's toe and shoulder , and the non linear bits
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in-between)
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I have been working with a number of ways to do this. One idea I am looking at
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pursuing is to use my film scanner as a 'virtual' digital camera and to create
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an ICC digital camera profile for the camera/film/scanner combination using a
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shot taken of a Macbeth color chart using my friends camera and film.
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I am no ICC color management boffin, so would appreciate this lists help.
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- Is this a technically sound approach?
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- Is this an approach one I would want to use, given what I want to achieve?
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- Would I need a grayscale ICC digital camera profile? (do they exist?)
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Question 2 - digital camera targets?
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Some pictorial black and white films can record a10-14 stop exposure range.
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This correspond to a scene brightness range of about 1:1000 to about
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1:16,000. I
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would not normally expect a reflection camera target (e.g. Macbeth color
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chart) to cover this wide a brightness range.
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- Are there alternative ICC digital camera profiling targets, methods or
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'work-arounds' that would help solve profiling camera/film combinations that
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can
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capture these sort of scene brightness ranges?
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(P.S I am using ColorSynergy4.5 for the profiling the B/W inkJet.)
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_________
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Peter Miles
Regards,
Roger Breton
Laval, Canada
email@hidden
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