OMG !!! this actually works to get rid of dead pixels. I am in shock !!

hollis_f wrote in post #16667464
Tried it with my 20D, 40D and 50D. It did nothing.

I don't think this feature was introduced until later. I think 5DII perhaps 7D.

Numenorean wrote in post #16667983
I don't think this feature was introduced until later. I think 5DII perhaps 7D.

Nah, the link the OP gave was to somebody claiming it worked on a 40D.

jvz09 wrote in post #16666433
can you get the pixels back? Like as you did this erroneously? Or to get back lost resolution after this has been done 10x times?

Every single pixel, 22 million of them for a 5D3, has two out of the three RGB values interpolated into it during processing. The problem pixel gets all three values interpolated in from its neighbors.

It's worked for some and not for others. It worked on my T2i fine. I haven't had any dead pixels on my 7D but I wouldn't be surprised if it didn't work.

As far as I know, Canon hasn't officially acknowledged that this is a real thing so it's hard to say for certain how it works. A lot of people have put a lot of work into sorting this out. There are a lot of very good hypothesis about how it works but nothing definitive. I know it effects the RAW image but when is really a guess. The hardest part to understand is why it works sometimes and not other times regardless of the color of the stuck/dead pixel or the camera body or firmware. I'm pretty sure it works at least as far back as the 450D/Xsi and 40D.

This thread reminded me that I had noticed a hot pixel on my 70D. So I invoked the manual sensor cleaning and the hot pixel has now been mapped out (I took before and after photos with the lens cap on to check). I also used this technique successfully on the 40D - in that case the hot pixel suddenly showed up after a firmware update, as if the new firmware had cleared out the hot pixel map.

Since Canon has never acknowledged this capability, noone knows what the exact procedure is, likely causing some people to miss an important step. (FWIW, I leave the lens on the camera.)

Steve-R wrote in post #16669554
in that case the hot pixel suddenly showed up after a firmware update, as if the new firmware had cleared out the hot pixel map.

That is good to know !!!!

I found this trick thankfully fixed a stuck blue pixel that was visible in the live view on my new EOS M in low light.

I just use CPR