Re: "Hot Pixels" are they an issue....
Re: "Hot Pixels" are they an issue....
- Subject: Re: "Hot Pixels" are they an issue....
- From: Steve Upton <email@hidden>
- Date: Mon, 26 Jan 2004 22:24:44 -0800
At 1:09 PM -0800 1/26/04, Douglas Rhiner wrote:
>
Both traditional and astro photographers have been using a technique to
>
remove "hot pixels"(Taking an image with the lens cap on and
>
subtracting it from subsequent images in Photoshop) from their images.
>
>
First off, is this an issue with any film scanners(in broad terms,
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specific if you wish)?
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I.e. would I benefit from applying said technique to my scans?
as the scanning CCD is "scanned" across the image (or vice versa) any bad pixels will show up as lines rather than dots. It does happen but it is much more obvious than a single pixel in a camera
>
Second, what would be the theoretical best material to scan(something
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infinitely black that does not transmit or reflect light)if I were to
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play with this? I realize there are many scanners/methodologies out
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there, so lets think in broad terms both in transmissive and reflective
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terms.
I guess something solid white and solid black. I don't expect you need anything too glamorous perhaps even paper would do. Then inspect each channel
Regards,
Steve
________________________________________________________________________
o Steve Upton CHROMiX www.chromix.com
o (hueman) 866.CHROMiX
o email@hidden 206.985.6837
o ColorGear ColorThink ColorValet ColorSmarts ProfileCentral
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