Color Line elimination at the edge of the photo

The company needs a white-bottom picture work card, but I only red bottom, so p a bit, the effect

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found that the edge of the body has a very clear red border. After thinking here, the reason to find the red edge is because the magic wand tool chooses the edge too thick:

, it is clear that there is a great gap between the edge and the ant line, so when the magic wand tool chooses the boundary, it enlarges the boundary pixels, and click to adjust the edge, adjust the edge detection radius, you can clearly see the edge of the ant line is slowly approaching, and finally set it up in a new layer. Finally, make a new fill layer and fill it with white.

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It can also be modified on a white basemap on the red side, but my method is also to modify the edge radius after the selection area, so it is not here to repeat.

Color Line elimination at the edge of the photo