Digital Light & Color

Hi,
So open an image, run Contour, change to Background Color (white), then change the Amount slider - error message appears, PWP8 freezes, have to Task Manager to close it.
With Background = Input Image, changing the Amount does not produce error.

I'm maybe using it wrong?

Fixed for next release. You are using it correctly - the problem showed up because the output image at 100% is black and white and it switches to color if the input image is color and the amount is set to less than 100%, and the code was not picking this up.