topic Re: White and blue pixels in EOS DSLR & Mirrorless Cameras

White and blue pixels

BrunoAwful — Wed, 14 Jul 2021 10:17:17 GMT

Hello.

My 600d (T3i) started to show some strange pixels, at jpg format: white pixels, Large and RAW: blue Pixels.

In the câmera lcd's screen it's also showing the pixelized image.

See the video https://youtu.be/ePOEXYo_xnM?t=27
It show how the problem peforme between the dark and light areas.

I updated to 1.0.3 firmware; reset to the factoru configuration; and disabled the noise suppresion at Fn menu.

The same occurs in movie mode.

I asked for an authorized Canon here in Brazil, but they can't repair because the Canon doesn't offer any materials to this model.

So, I'm here to ask for help to avaliate what kind of problem is it? Is it a cmos problem? Is it an advanced configuration?

Thank you.

Bruno.

Re: White and blue pixels

Peter — Wed, 14 Jul 2021 07:09:51 GMT

Open a raw file in RawTherapee. Change demosaicing method to None and take a look at Bayer pattern. Some of the columns may not work as they should. The GIF file below shows how to change demosaicing method (and how to remove hot pixels, but that is not the case here).

Re: White and blue pixels

BrunoAwful — Wed, 14 Jul 2021 10:36:56 GMT

Thank you for the answer.

But its not the case.
The images still show the strange pixels

Thank you

Re: White and blue pixels

shadowsports — Wed, 14 Jul 2021 13:04:18 GMT

Greetings,

Have you ruled out a bad memory card. Have you tested with another lens mounted?

Funny cause I'm not seeing whatever he's describing in the video. (unless its black text that looks blue)?

Re: White and blue pixels

Peter — Wed, 14 Jul 2021 13:57:30 GMT

@BrunoAwful wrote:
Thank you for the answer.

But its not the case.
The images still show the strange pixels

Thank you

What is not the case? Does the Bayer pattern look normal? Perhaps better you just upload the raw file.

Re: White and blue pixels

ebiggs1 — Wed, 14 Jul 2021 16:20:43 GMT

In your top picture, it is so abstract I can't tell if anything is right or wrong. I see nothing wrong in the bottom picture.

Updating the FW will not help stuck or hot pixels. Besides you should never try it on a malfunctioning camera. Not even on one you suspect to be malfunctioning.

The advice to try a new SD card and the default reset is really all you can do to warrant out the camera as the fault.

BTW, you can't u/l a Raw file here. It will likely exceed the forums size limit.

If you are seeing hot or stuck pixels they are generally not a huge problem. Photoshop has a reliable filter to remove hot pixels. No biggie. Lightroom isn't as easy or good but it can remove them too. Soemtimes you get a dual hot pixel. These give LR more trouble to remove but you can do a pretty decent job just takes a bit more input. Some hot pixels are to close to the brightness of surrounding pixels so this makes them a bigger problem.

Re: White and blue pixels

Peter — Wed, 14 Jul 2021 19:31:15 GMT

Easier to see on a real screen. Not hot pixels I guess but a failing column in the Bayer pattern. Some years ago a member here posted pictures from a 70D with similar problem, but dark pixels https://community.usa.canon.com/t5/EOS/Red-Grain-in-the-Under-Exposed-portions-of-the-Image-Canon-70D/m-p/282386/highlight/true#M40283

Re: White and blue pixels

BrunoAwful — Thu, 15 Jul 2021 21:26:23 GMT

Thank you for the reply.

Yes, I tested with other SD cards and the same problem.
IN the video the the text is really black, but it isn't the problem

The point of this video is the noise that appears on the white area.
If I take a picture, the noise turns in thousand of white dots, or blue.

Thank you

Re: White and blue pixels

BrunoAwful — Thu, 15 Jul 2021 21:27:51 GMT

Re: White and blue pixels

BrunoAwful — Thu, 15 Jul 2021 21:38:12 GMT

Thank you.

In the shared post (under exposition t5 case) doesn't apply to this problem cause even I shoot under direct light, the noise will appear.

I called to a Canon assistance to send the t3i to them analise. They don't have any original piece to fix. So I ask the you what is the substitute for the t3i.

Thank you

Re: White and blue pixels

jrhoffman75 — Fri, 16 Jul 2021 12:25:02 GMT

@BrunoAwful wrote:
Thank you.

In the shared post (under exposition t5 case) doesn't apply to this problem cause even I shoot under direct light, the noise will appear.

I called to a Canon assistance to send the t3i to them analise. They don't have any original piece to fix. So I ask the you what is the substitute for the t3i.

Thank you

The T3i is an earlier version Rebel.

Any later Rebel will be a replacement and you can use all your existing lenses.

Just go to the Canon eStore and look for a refurb that is in your price range.

Canon Refurbished EOS Interchangeable Cameras | Canon Online Store

Re: White and blue pixels

ebiggs1 — Fri, 16 Jul 2021 14:26:49 GMT

"They don't have any original piece to fix. So I ask the you what is the substitute for the t3i."

The T3i isn't worth much so any repair that runs over than amount isn't logical. You can simply replace it with another working used T3i camera. The better solution is an upgrade camera. More modern and more serviceable.

Re: White and blue pixels

normadel — Sat, 12 Feb 2022 13:46:44 GMT

If you only have EF-S lenses (crop-sensor), ANY crop-sensor camera model can be a substitute...a Rebel, an xxD, or a 7D.

If you have full-frame (EF) lenses, ANY EOS body will do.