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 Post subject: Spot on Photos
PostPosted: Sun Sep 14, 2008 11:04 pm 
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Does this look like dust or something else: http://picasaweb.google.com/Brandon.T.Hall/Lightning#5246015695576984482

The link is a crop of a picture with my lens cap left on. I saw a red dot on a my pictures and am trying to figure out how to fix it or if it is even possible to fix.

Thanks for any advice or suggestions!


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 Post subject:
PostPosted: Mon Sep 15, 2008 2:45 am 
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Looks to be a hot pixel on your sensor.

The way to fix it is clone it out in photoshop, or send your camera in for a maintenance/service.

I wouldn't make too much of it though. If you have any photo editing software, chances are it can delete it for you.

But the red is just a defective pixel (well it seems to be) on your sensor.

I have some 5+ hot pixels on my sensor, and a butt-load of dust, I just clone them out...

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 Post subject:
PostPosted: Mon Sep 15, 2008 6:55 am 
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Look in your camera menu and see if there is a pixel mapping function. If so, use it and that should fix it. They expect the odd bad one to appear occasionally so have the ability to map it out.

There is another related possibility. Was the exposure a particularly long one? Say over a second? That also tends to amplify any noise of the sensor even when there isn't a specific fault as such. In this scenario cameras may offer a long duration noise reduction to reduce this effect.

Both the above options are available on my Olympus E-510 and Sony A350 so I'd expect it to be available on most if not all DSLRs.

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 Post subject:
PostPosted: Tue Sep 16, 2008 5:45 pm 
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It was a long exposure, and I am using a Canon 40D. It appears there are several "hot pixles" throughout the image when examined in detail. Is this something that I should worry about getting fixed (its still under warranty) or is this fairly normal with Digital?


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 Post subject:
PostPosted: Tue Sep 16, 2008 9:24 pm 
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bthall17 wrote:
It was a long exposure, and I am using a Canon 40D. It appears there are several "hot pixles" throughout the image when examined in detail. Is this something that I should worry about getting fixed (its still under warranty) or is this fairly normal with Digital?


If it's still under warranty, I suggest calling Canon and asking them if you can send the camera in for a "check up".

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 Post subject:
PostPosted: Wed Sep 17, 2008 4:30 pm 
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My 40D had one of those when I was doing a bit of night work. After the long exposures had passed and the sensor had cooled down it was gone. Is it still there?

Mark

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