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Raster changes colour

Question asked by BTLeslie on Aug 13, 2014

I have a GeoTiff that changes colour when I zoom into it.  It looks like the red channel goes missing.

 

I'm am not using any gamma strect or fancy display scales (in fact I have tried playing with the stretch options a bit and am seeing no improvements).

 

The change seems to happen between scales of 1:8000 and 1:6000.

 

I am doing a raster QA task so it's important I see what it really looks like.

 

I get the same problem in QGIS or Arc does anyone know of what might be causing this problem?

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