Sorry to ask, but are you sure that this is the well-known Foveon blotching?
The reason I am asking is that the effect is pretty local. There are parts of the picture which are of the same structure and color and equally dark or even darker but don't show any blotching. In addition, there is a part in the foreground which gets some sun and therefore has much higher luminance but still shows the same blotching as if the blotch "doesn't care" about the change of light.
I think it is. I have three Merrill cameras. SD1M, DP2M & DP1M. They all do it at different times but it is only really obvious against surfaces like grey carpet, bitumen etc. And I think although it occurs more at 200iso & more, it does happen at 100iso.
Check out the grey carpet in the attached image. The magenta is not as pronounced as in my first upload - but it is still obvious & if this was a photo I was going to use, I would have to remove it all.
The crop of the photo below was taken with the SD1M at 100iso. (I did not want to show the whole image for other reasons) But the full image had some mild editing in LR & was corrected in pt lens, but it was only a record shot that was not worth spending much time on.
So, I don't think the magenta blotchiness is unique to my DP1M, as all 3 do it. It just shows one of the subject limitations under certain light conditions that foveon sensors struggle with.
However the duds are far outweighed by the successes, & I thanks to the help here, I have a couple of ways of correcting the problem.
