healing tools not working in Freq Separation

[Shoogles]

Hi Folks,

 

I'm having a go a retouching portrait photographs and have been following the video tutorials pretty closely.  I find that the various healing and blemish removal tools have no effect when I'm working on the low frequency layer.  What am I doing wrong?

 

To be explicit, here's the sequence of activity:  I create a duplicate of the original pixel layer which I then 'un-tick' to hide.  I then choose frequency separation from the filters menu, accepting the default settings for radius and so on.  I then un-tick the high frequency layer and try to use the tools to remove spots and wrinkles etc on the low frequency layer.  Nothing happens.  However, I un-tick both the frequency layers, and select the original background pixel layer, the tools work on that. 

 

I've been scratching my head about this and can't work out what my error is.  Help! 

[Shoogles]

D'oh!  I've got it now.  I hadn't registered that I need to do more than just have the low frequency layer ticked.  It must be selected as well  (i.e. it must be blue).  Of course it's obvious... when you realise!.

 

Sorry to waste the space but perhaps someone else will read this and learn from my idiocy!