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Why are my 'NoData' areas displaying in different colours?

Question asked by on Jan 16, 2015
Latest reply on Jun 4, 2016 by

Hi there,


So I masked out an area of an image in Erdas a long time ago and these areas successfully display as 'NoData' (using the Identify tool) and are blacked out.


Today I masked out another area of the same image using SetNull so this area too is 'NoData'. However, my two areas of 'NoData' display differently and I was wondering why this is?!


When I change the colour of 'NoData' under symbology only one area changes whilst first area remains black.


Any ideas would be great.