Composite map colors

[niarve00]

I have 2 offline .img maps which need to be joined together because other contains routes. Problem is that when i look that map in offline maps it looks good and colors are ok but when I create map with composite map tool colors look bit weird, eventhought I add only that basemap without layers. Why the colours change?

[niarve00]

 I figured out that in my basemap white color is transparent and in composite map there is blueish background and that is showing thru basemap. Is there change to change background color or solve that some other way?