Raster transparency colour

Discussion created by icelandic0 on Feb 25, 2014
Latest reply on Feb 25, 2014 by icelandic0
I can't solve this problem. I have two georeferenced rasters but in both of them boundary are white and it looks like on screenshot beneath.

What I have to change/ set/ to make this white strip in the middle between two rasters 'unvisible'. In such primitive soft like MapInfo it's pretty easy but here... i don't have any idea.

I'm using ArcMap 10.2.1.