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11/11/2005 07:24:26 AM · #1 |
Has anyone seen/used this?
While of course cleaning the sensor is the best solution, there may be reasons that you can't clean it at that time, or maybe you've already taken the shot etc.
Anyway, it occurred to me using a white(?) background it would probably be possible to do dust removal, or at least improve the quality of dust removal by doing a dust subtraction using techniques analogus to dark noise substraction. I did a quick search and at a glance saw only one product that appeared to implement this.
Is it just not worth doing(i.e. current techniques/tactics are "good enough")? Just something many people haven't thought of? Or has anyone seen and/or tried a product that does this? how'd it work out? "Image Sensor Lab" was the product I came across that appeared to do this. 5000$ is a lot of money for something I'm just curious about so... :)
Message edited by author 2005-11-11 07:31:41. |
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11/11/2005 10:34:50 AM · #2 |
A software solution for dust removal is a possibility, but there are a few "gotchas."
- The appearance of the dust varies with the aperture, so the software would need to store a map for each aperture, and read the EXIF to determine which map to use
- The lens in use can also make a difference. The more "telecentric" the optics (parallel light rays to the sensor) the worse the dust will appear (sharper shadow from the dust on the sensor). So the software might have to be aware of the lens in use as well.
- Dust particles regularly move about and fall off, and others are added regularly. The "map" would need to be updated very frequently to be most effective.
There are other possible issues with an automated software dust scrubber, but I think these are the major ones. All in all, I think sensor cleaning is a preferrable solution!
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11/11/2005 12:03:18 PM · #3 |
Nikon's own RAW/NEF converter Nikon Capture 4.x has that method. You shoot a dust reference photo, let Capture know where it is and when you have a photo with dust in it you can let it subtract the dust.
I have never used that feature.
Recently cleaned my sensor with a Sensor Brush. Easy and fast.
Dust on the sensor is increasing, so you cannot trust the software to solve the problems. One lens swap can alter the dust map and renders your dust reference photo useless. Unless you shoot a new dust reference photo after each lens swap. But when you start to do that it becomes a lot of work. I can clean my sensor in the time that my computer needs to start up and run Capture.
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11/11/2005 12:18:47 PM · #4 |
| Whats wrong with photoshops, healing or clone tool? |
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11/11/2005 12:38:34 PM · #5 |
Originally posted by henry_buckle:
Whats wrong with photoshops, healing or clone tool? |
When you have to heal/clone 100 photos from one shoot you are not happy. A dust reference substraction method can be used in a batch process.
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