Q:

Having issues removing white background from Raster images

I've got an issue with 4 raster layers that I have converted from kml files into layer files. It would only allow me to convert them if I used ground overlay and now the 4 raster images are overlapping each other. I can't come up with a way to let them all be seen without the background obscuring the other images behind it. I've tried using symbology options and it doesn't do anything. 
I've attached a screen capture. Basically the white background is what I'm trying to get rid of. I'm not sure if it's possible though. 
Also I have the original PNG's and when I import the png's themselves and edit the background I can eliminate the white background however they have no spatial reference. When I try the same thing with these layer files you see in the screen cap, it doesn't work. Any thoughts? 
Thanks!
-Brett

A:

Have you tried changing these settings? In your instance, you want (255, 255, 255) to be displayed as no color (transparent). If the pixels represented as white are 'NoData', then you can set that option to no color as well. 

