Many years ago, a change was made to how Raster Design transparency worked, and more than one customer was looking for the old behavior, or even better, an option to choose between the two. We are happy to announce the following enhancement to Raster Design 2014:
The RasterDesignAutoTransparency system variable.
This setting indicates whether to automatically turn on image background transparency when a transparent color is chosen. The default value is "ON" (AKA "1"). It can be switched off by changing the value to "OFF" or "0".
Just a little more info regarding this:
Black is the default color.
If the user wants a different color they can choose that color with Raster Design.
Set the transparency color as desired (pick the pixel in the image).
Then turn off transparency.