Is The ‘Bump Map’ Option in Live Lighting Filter Broken in v2 APhoto? (SOLVED)

[markw]

Steps;
Open the Colour image file in APhoto and add Live Filter > Lighting.
At the bottom of the Lighting Panel add the grey scale BrushStroke image as the Bump Map.
Result = Nothing changes?
Expected: Lighting to pick out the brush strokes so giving a 3D look to the painted letters.
Have tried this in both current retail version and current beta versions of APhoto.
Test files Attached.

Or am I simply misunderstanding what the image requirements for the Bump Map image are for this to be successful?

[Obscured]

.

[markw]

@Circulus Brilliant! Simple when you know how! Thank you😀