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Forum: Pentax K-1 02-05-2017, 11:52 PM  
White dots... Just once.
Posted By biz-engineer
Replies: 13
Views: 1,058
Fair enough. I'd be worried is my post processing was creating white dots in the middle of a black area. Also, it that was post processing that create white dots from the black by whatever constructive interference / digital rounding, it wouldn't create 3 dots, it would create thousand of white dots for the zone having the same level of black.
Forum: Pentax K-1 02-04-2017, 11:53 PM  
White dots... Just once.
Posted By biz-engineer
Replies: 13
Views: 1,058
Interesting answers, but nothing realistic.
How to test for sensor detect. Take a series of alternate white frames and dark frames with the same settings (manual mode).
If you don't find white dots, you can conclude that the dots you see on this picture were particles in the air at the moment you took that shot.
Can also be dust on the back element of the lens, as you changed the lens, the dust was gone.
Can also be dust on sensor, if you have the sensor cleaning turned on, you did not see dots in the subsequent shot because the dust was gone.

Usually when you see dots like those , in the image, it's either dust on the rear element of the lens, dust directly on the sensor, or hot pixels of the sensor, or other random fabrication induced defect of the sensor chip. Dust on the front element of the lens don't show up as dots in the image.

Regarding the hypothesis of post processing creating white dots in a dark area , I don't believe it.
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