Selective transparency

[aka]

Hi,

Look, please, at the following image:

   

I wish to transform the big black area in transparency (but not the hair of the girl    ), and very important:

• I need to draw the visible areas with my mouse,
  
• I do not wish to work by deleting the areas that are going to become transparent.
  

Can someone have a way to do that ?

Thanks

[rich2005]

More than one way. One option is use a layer mask. Just one question, is the image the actual size ? A larger image might need the selection feather adjusting.

The black area is one large area so use the fuzzy select tool
Enable Feather Edges and set a value 12 to 16.
If Draw mask is enabled, click in the black and drag the mouse to show the extents of the selection. That adjusts the threshold as you drag (otherwise set the threshold 60 to 70).
Once you have the selection Layer -> Mask -> Add layer mask and choose options Selection and Invert mask
Kill the selection.

This a one minute video of that: https://sendvid.com/dlld18h4