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Open an image on your canvas. Use an image which is not too big.
Select the Magic Lasso tool from the toolbar and select the background. Your image will look like this after selection.
Click on Select>Modify>Smooth from the menu. Give a smoothness from 2 to 4.
Next click on Filter>Modify>Neon Glow, the neon glow window will appear like the one on the right.
Play around with the settings till your glow seems fine and click on OK.
Here's the image with a halo.