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DPChallenge Forums >> Out and About >> Washington DC Night Tour June 12
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 06/18/2004 10:31:05 AM · #101
There's some interest. I need a pretty good push to do a second one this year. It's reasonably time intensive to get the whole thing organized. I'm also trying to see if we can get access to some areas you normally can't photograph. For that I need permits and accurate headcounts. :)

Clara
 06/18/2004 11:22:21 AM · #102
Originally posted by richterrell:
David,

Is there any post processing or in-camera adjustments that are being made? I am surprised that a one-second exposure would have such hot pixels. I think for a baseline it would be great if someone could perform the same test with a different D100 to give you something to compare to.


I agree. I'd like to see another D100 under the same conditions. No post processing done to the 2nd & 3rd images. The 1st, (in color), had been processed in PS w/levels USM, etc. and then Neat Image NR. Looks like crap if you ask me.

Originally posted by richterrell:
I did roughly the same tests with my D60, and sure enough I have some hot pixels, but they do not show up significantly until I hit 30 seconds or longer.


Consider yourself lucky. I wish I could say the same. I'm going to go through and clean all of my equipment here shortly. Who knows, maybe that will help.

Originally posted by richterrell:

Edit: As far as what you might be able to do to correct these images, google the term "Dark Frame Subtraction". This is a method that can be used to difference out hot pixels from an image.


Very cool. I am going to do more research on this. Looks like a category of Night Shooting I was completely missing.

Thanks for the tip(s) Rich. I appreciate it! I'll let you know how it comes out.
d
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