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"staircase pixellisation"


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I'm working on an image taken yesterday. It's a picture of  a circus big top with yellow and blue stripes. Raw file, 16 bits. Depending of the angle of the stripes (spiral pattern), the junction between blue and yellow is pixellized in a staircase pattern at some places, on all of the four frames I took.  Those artefacts appear in no other image, in fact I've taken many thousands of pictures with my D700 and 24-70 zoom, and it is the first time I see this. I was using a polarizing filter. The pixels are visible in the raw file without sharpening.

 

 

Anybody knows why this happens and how to get rid of  the artefacts if possible?

 

 

Thanks

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