S_Emboss matte use - Alpha (bug)

Hi

When using S_Emboss on a image with alpha channel, nothing happens when toggling between luma/alpha in the “Matte Use” option.

The emboss effect works on all luma details in the image when using luma and should change to outline (alpha channel) when selection alpha in the “Matte Use” option.

This problem is in all S_emboss plugins.

Can anyone confirm this?

Best regards,
Jakob Eriksen