Re: 16 bit scan vs. 8 bit scan/16 bit conversion
Re: 16 bit scan vs. 8 bit scan/16 bit conversion
- Subject: Re: 16 bit scan vs. 8 bit scan/16 bit conversion
- From: Jim Rich <email@hidden>
- Date: Sun, 26 Sep 2004 11:45:03 -0400
On 9/25/04 6:53 AM, "Boris Missirkov" <email@hidden> wrote:
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I agree with Dave Scharf's advice: do "pre-processing" of each single image in
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16
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bit, then compose them together in 8 bit. I did pretty much the same lately,
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assembling a series of 12 panos with 6-10 180Mb scans in each. (Even in 8 bit
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mode I
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ended up with 2.5 Gb PSD files sometimes, which was quite a job for my G4.) I
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sometimes upconvert the final flattened image to 16 bit for general or local
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corrections (that does not add data, but reduces the risk of posterization -
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especially in areas with slight gradations) and end up in 8 bit for print.
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You might take a look at http://www.radarlab.net/billboards.htm , if you're
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curious
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to see the results.
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Best:
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Boris
Boris,
I was wondering, how often do you see or experience posterization in those
slight gradations when you work and edit 8 bit images?
Does this happen to you every time? 50% of the time? once in a while? or is
this a just in case strategy?
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From your comments it sounds like it happens a lot. And if that is the case,
that is a sign that your capture process is broken.
Jim Rich
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