When the image has rounded corners, specifying an overlayColor will
cause the remaining space in the corners to be filled with a solid color.
This is useful in cases which are not supported by the Android
implementation of rounded corners:
Certain resize modes, such as 'contain'
Animated GIFs
A typical way to use this prop is with images displayed on a solid
background and setting the overlayColor to the same color
as the background.