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01/01/2005 07:26:52 PM · #1 |
I have a Kodak DX6490 and I noticed that several of my photos that were taken in a low lighting situation have imperfections where a pixel was not dark like its surrounding pixels, but blue. It is usually not that hard to patch them up a little with photoshop, but, A, it's still annoying that it exists and that I have to fix it, and, B, by fixing them, a photograph is rendered illegal for challenges allowing only basic editing. What exactly is happening and is there anyway to fix it? It would be nice to find an in-camera fix, but at this stage I don't really care as long as it allows me to stay legal without a lot of hassle.
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01/01/2005 07:35:11 PM · #2 |
The problem is know as "hot pixels". Without going into the how & why, they do show up most in low-light situations, especially if the camera has shifted to higher ISO to compensate.
If your camera has an option for "long exposure noise reduction", turn it on, and you should notice a big improvement. If it does not have this option, there is really nothing much you can do in post-processing that is basic-editing legal.
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01/01/2005 07:39:06 PM · #3 |
What you are seeing is that some pixels have more dark current leakage then others, this shows up in long exposures. In some cameras there is a mode that will take two photos, one normal and one with the shutter closed, the camera then subtracts the one with the shutter closed from the normal exposure. This can help remove much of the noise from long exposures. I am not sure if your camera has this mode of not.
If you can open aperture more this is shorten the exposure time and reduce the noise.
And then there is always more light, not always possible.
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01/03/2005 02:11:34 AM · #4 |
| Hey, great, thanks a bunch y'all! Unfortunately, there's nothing I can do about it in-camera, but I didn't expect there to be: it's only what I like to call an "advanced entry level" camera. I think the wise idea here is for me to get more general experience before I go running off into the dark taking pictures. |
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