strange raster/lines on M8 pics

[Guest willjanurgucken2000]

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Hello!

 

What the hell is that on my picture???

Seems like a raster or lines...

 

M8 a ISO 2500, no post processing, only white balance, via LR3, Camera Standard Profile.

 

100% crop:

http://s1.directupload.net/images/111015/imfcfapr.jpg

 

 

Is this a sensor error?

 

 

regards

will

[adan]

Without ruling out the possibility of a sensor problem (anything is possible) - I'm mostly seeing shadow noise banding that shows up fairly often with a perfectly "normal" M8 at ISO 2500 (and with practically any digital camera if shot in strange-enough light).

 

Especially under non-daylight lighting. If the light is yellow enough, the blue-filtered pixels are essentially underexposed by another 2-3 stops (or more), compared to the overall exposure. Correcting the white balance effectively pushes (amplifies) those blue pixels to ISO 10,000-20,000 - and outs pops the banding.

 

The attached is an M8 picture, under candlelight and white-balanced. ISO 1250. Lots of shadow banding, especially in the shirt at right.

 

(Ignore the moire effects in the middle of the picture - those are from a doubled screened tent wall in the background, moire-ing with itself )

[Alberti]

Will,

Although I can't find a picture immediately, I remember these have also been identified also as JPEG artifacts [in adverse circumstances, low light indeed]. The square islands have been identified as the sectors of the compression algorithms.

I have checked that banding on the internet a two or three years ago - and a similar picture was shown [of another camera, where the effect appeared at more light even].

 

I routinely throw away pictures with such artifacts. the are very seldom: subject matter, circumstance and lighting, and processing. Nothing to do with the esensor.

Hope this helps you.

albert

[mjh]

Is this a sensor error?

Just the banding kind of noise that you get when pushing the sensor to its limits.