hot Pixels

[matty]

Noticed i got 4 or 5 white pixels showing on my piccies now, any cure or is it time to flog a kidney for a 20d?:thinking:

[digitalfailure]

the cure is called photoshop :D

[RobertP]

I did a lot of checking with my camera when i got it and found a hot red pixel in my images. I searched around a bit and read up on it and it is nothing unusual. You can't see it normally and I stopped worrying about it. Think i also read at the time that Canon service can map out any hot pixels.

Not sure how you get white pixels - thought you would get either R G or B ??

[matty]

i posted a pic in sharing, the 3 dogs in a row, you can see the pixel top left of it, and dark shots show them really badly. I do normally shop them, but im sure im seeing more than i used to

[stepheno]

Hope this helps - a dead pixel will show up black, a stuck pixel will show up in the colour (RGB) that it's stuck on, a hot pixel will show up as white. A hot pixel is one where there is a higher than normal charge leakage.

Dead, stuck and hot pixels can, and will affect any digital camera. There is a very good chance that your camera (regardless of who made it or how much it cost) was manufactured with dead, stuck or hot pixels. It's a fact of life. Before a camera leaves the factory it is "pixel mapped" to check for pixels that are misbehaving - but the manufacturer won't change the sensor - they will run a diagnostic which will create a virtual pixel (doesn't record anything) which hopefully won't show up. Then they will sell you it. If you return it to Canon/Nikon etc they will just re-map the pixel(s). If you return it to the retailer you will more than likely get a camera that has been returned by someone else with more dead, stuck, hot pixels than you originally had

When you take a shot and use PS to map out and erase the offending pixel you are doing just what Canon/Nikon etc do before they sell the camera. I have two dead pixels - out of 8 million - I never see or notice them but if I did, then a quick shop and it's gone. I am not going to return my 20D to the retailer or Canon and get it back two weeks later with, probably, more naughty pixels than it had before.

regards

[matty]

good info! thanks

[Arkady]

I think I can do this myself using the same control as for the dust-mapping thingy on the D2x. Should do the same thing. Takes a reference shot and does a 'nearest-neighbour' comparison and the software replaces the 'dead/hot/wobbly' bits accordingly. Maybe...

[stepheno]

Spot on, Arkady - I'm sure you could.

regards