Hi,
I have a Worldview-3 MUL image that has no_data = 0,0,0. 
If I send that to ATCOR, I get No data at those locations :
So far so good.
Now, when I scale the result to 8U. the NoData, which originally was 0, now gets an arbitrary value like 120. For some reason, each channel gets a different value so I get for example RGB = (120,33,56) instead of (0,0,0). I noticed that that triplet of arbitrary values changes as a function of scaling algorithm. Is this a known issue ?
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Hello Yves,
This problem should not be occurring as the SCALE algorithm will maintain the NO_DATA_VALUES. Please make sure you are using the most recent version of Geomatica - Banff: https://www.pcigeomatics.com/trygeomatica. This could be a problem with your specific dataset. If you continue to get the same problem when using Geomatica Banff you can contact support@pcigeomatics.com and they can assist.
Hope this helps!