Creating a star mask

Am trying to follow the process in Fundamentals in the example for NGC3486 - Deconvolution working on a non linear luminance image (NGC4565).  Have created an object mask but having difficulty creating a star mask which on the face of it seems a simple enough process to follow.  The result seems almost inverted with a white background?  I have been known to miss the most obvious but would be grateful for some help.

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