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Geotiff visualizing issue

Question asked by FRANESCARUSSO22 on Oct 31, 2017



I have received many  Geotiff for a Side Scan Sonar imagines. Once imported in ArcGIS 10.2.2 most of them look fine and visualizing ok.
Some of them show a white triangle (like data missing -it look like the geotiff imagines are made of different tiles. Please see Fig 1).

If I un-tick the "Apply gamma stretch" box in the symbology tab, it become a black triangle (see Fig2). Does the "tile" become black because doesn't have any data associated?

I am a bit confused as sometimes if I change the parameters (like the gamma stretch) it  works (see red arrow in fig 3) and sometimes it doesn't (see blue arrow in fig 3). I do not really know whether I have to change something else or it just mean that there are no data along with the geotiff.


Any suggestion?