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DPChallenge Forums >> Tips, Tricks, and Q&A >> Removing hot pixels in Basic Editing?
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11/05/2004 09:39:06 AM · #1
I know that spot editing is not permitted in basic editing challenges, but what can I do about hot pixels showing up, other than getting a new camera? The rules state 'Any filter or stand-alone utility designed and used to preserve the integrity of the image and/or reduce the effects of noise, scratches, etc, are permitted.'

I guess that I'm asking whether, say cloning out a hot pixel would count as one of the above. Anyone know? I'd hate to have my (sure to win) entry disqualified and I'd hate to enter it with the great red dot in it.

Thanks.
11/05/2004 09:44:48 AM · #2
If the Dust&Scratches filter fixes it then it's OK, but no, you can't even clone out a hot pixel in the Basic challenges : (

It may be possible (for your camera) to have the firmware upgraded (or whatever process they use) to "map out" the hot pixel, so that it doesn't show up.

If you know where it is in the frame, you can try and compose the photo in such a way as to put the hot pixel in a less-important area.
11/05/2004 10:08:05 AM · #3
Noise reduction programs, such as Neat Image/Noise Ninja at low levels of application may reduce the problem so that it's not noticeable.
11/05/2004 10:13:11 AM · #4
If the hot pixel is a colour other than white, for instance I've had magenta and bright green ones, you can use Hue/Saturation to change the colour and brightness to match the background.
11/05/2004 10:17:50 AM · #5
Originally posted by PaulMdx:

If the hot pixel is a colour other than white, for instance I've had magenta and bright green ones, you can use Hue/Saturation to change the colour and brightness to match the background.


I guess this might work, but only if the pixel is a color that doesn't exist anywhere else in the image, right? Since you can't just select that pixel to do the hue/saturation filter on.
11/05/2004 10:26:39 AM · #6
Originally posted by skylen:

I guess this might work, but only if the pixel is a color that doesn't exist anywhere else in the image, right? Since you can't just select that pixel to do the hue/saturation filter on.

Yep, exactly. I've found the pixel to normally be a very bright colour that is easy to isolate. Reducing the range to specifically that shade makes it much easier too.
11/05/2004 10:29:35 AM · #7
I know that it does not apply to the 300D, however for those whose cameras support internal fixed pattern noise reduction (look for a noise reduction setting description that includes subtraction of a dark frame), turn this on when using long exposures and/or high ISO settings. Anything done in-camera is legal.
Note that on many cams, this will result in a much longer capture time, since the camera essentially takes a second "shutter closed" exposure to subtract from the image.
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