How to separate a luminous object from the background?

You need to separate the glowing object in this picture from the background, so that the glow remained the same.

P. S. Yes, everyone understood that you can draw the same with his arms. I wonder is there any technique that can do the above task...
April 7th 20 at 15:38
2 answers
April 7th 20 at 15:40
You have a picture of a ready-made alpha-channel.
  1. in the layer of the images Ctrl+A, Ctrl+C
  2. allocate the layer with the picture (and it is better to create a new Fill Layer with white color), the menu Layer > Layer Mask > Hide All
  3. allocate the layer with the picture (or Fill Layer), open Channels, highlight the layer mask, change mask (eye)
  4. Ctrl+V to turn off the eye
  5. if necessary, adjust the Brightness/Contrast of the mask to adjust the opacity of the glow

April 7th 20 at 15:42
1) Ctrl+Alt+Shift + click in any of the RGB channels. If there is Alpha channel, it is better in it. (creates a selection of color intensity in this channel)
2) Ctrl+Shift+i (inverse selection)
3) delete (to remove the black, leave white)

But, in the specific case, the better the picture overlay in Screen mode.
All a bit complicated, too many buttons written.
Just hold down Ctrl and poke into the layer to select by color intensity in the layer. Or Ctrl+Alt+3/4/5 to allocate in R/G/B channel of the active layer.
Or Ctrl+Alt+2 to make the selection according to the brightness of the layer (similar to switching to Lab color and highlighting at the L layer). - peter.Blick1 commented on April 7th 20 at 15:45

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