Thumbnail color - drawing images

Background:

During check in, thumbnails are generated for both models and drawings, so far so good.

I use a mapkey to use only the custom check in routine with both models and viewable objects.

What I would like to control is how the thumbnail drawing images are generated.  I don't have any issues with the model.

Issue:

When I use a blue background and check in, I get this in Windchill, both large and small thumbnails:

This is not so legible.  It opens in Creo View like this also and is very difficult to read.

When I change to a white background:

This works and is legible in WC and Creo View.

So the question:

How do I configure the monochrome thumbnail creation without having users change or force to B/W background?

Thanks