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Does anyone know why I'm getting magenta noise on my images. It's very inconsistent when it happens, and I'm having a hard time figuring out what's causing it. enter image description here

I'm seeing the 'noise' predominantly in the circled areas below...

enter image description here

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    Nice photo! On my calibrated, 97%sRGB monitor, I cannot see "magenta noise" in this picture. I can see some areas that are noisy and magenta by natura, and I can see some areas that are highlighted magenta. It does look a bit magenta-ish in total to me. Could you maybe draw an arrow or circle to the areas so I can see it more easily? – flolilo Dec 8 '18 at 16:24
  • Are you talking about a magenta color cast or noise? A color cast likely indicates a white balance problem. Also, changing camera, subject, and lighting placement can make the amount of magenta vary from image to image. Noise would look like random specks. It is expected to be "inconsistent" because it is random. – xiota Dec 8 '18 at 17:24
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    I can see it, especially obvious on the backdrop. It's not noise as I define it, more like quantization effects from compression. Is this from a RAW file or JPG? – BobT Dec 8 '18 at 19:01
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    I added where I think the noise we are talking about is - please let us know if I got it right - we can always change it if not. [it's a bit vague & looks different at different zoom factors] – Tetsujin Dec 9 '18 at 8:57
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    Can't be the memory card (or any storage media). If random bits are changed in a picture, you don't see noise, you see a broken picture. Did you update LR recently? Is still LR using the very same settings ? – xenoid Dec 9 '18 at 9:31
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First of all. Make some more tests.

Take a photo of a pure white surface, a piece of new paper, take it out of focus and take a look. Try to isolate some other factors, like the time you are using the camera (this can heat the sensor) or room temperature.

There is a chance something is happening to your sensor, probably some overheating.

(I have a similar problem with a video camera. I'll make some tests too)

(Offtopic. Probably you are pushing too much magenta into the processing, therefore exaggerating a bit a magenta cast)

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I also see yellow noise along with the magenta.

Possibilities.

1) Possibly processing artifacts from in camera or in post. Are you shooting RAW or jpeg? Is it happening in the original image or in post processing?

2) Reflections from colored objects in the room or light coming though a window or relecting off glass and creating a prism effect.

3) Are you down converting your color bit depth or converting to a substandard profile?

4) Do you have the saturation cranked up? It looks oversaturated, especially on the skin. There is noticeable clipping.

5) Have you switched your lights to see if it's a failing bulb? It could be an old bulb.

6) Are you using a filter? It may be dirty or smeared.

My guess is saturation/clipping based on limited info and what I see in the pic.

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