I have an image of a child I isolated. When I choose a dark or non-bright background for her picture, her hair is not looking good: a halo of white remains around it.
How can I fix this?
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Create a copy of your 'cut out' layer and set the blending mode of that copy layer to DARKEN rather than NORMAL (sometimes MULTIPLY, COLOUR BURN or a different blending mode will work better than darken, depends on the background). This should sit behind the original cut out which should still be set to NORMAL.
You then need to mask the two layers so that the DARKEN layer is only used for the wispy bits of hair and the layer that is set to NORMAL does everything else. You could just erase the wispy bits from the NORMAL layer, but I would recommend using layer masks as it is reversible / non destructive.
Hope that helps.
Here are four methods which I use when using photoshop.
Layer > Matting > Defringe
Set the pixel to 1 to start, you may need to increase this.
Select > modify > contract
try to contract the selection by 1 or 2 pixels to begin with
use a very soft brush for the eraser tool and lower the opacity. Lightly brush the edges of the image with the brush, this will lower the opacity of the white pixels and the edges will start to blend.
Select > refine edge
Play around with this will tool to find what works for you.
I hope these help, I am sure there are plenty of other ways to do this, these are some I have used.