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If a colour is to be selected, then I would always start with a close look at the channels. Most probably these will have different greyscale values.

I would choose my channel, duplicate it and try to select on that one with masks (start with a soft large brush and the more you approach the edge, the smaller your brush should be, but always use a soft-edged one. finally you should go just across the edge with the soft outer edge of the brush).

Then I would apply that selection to the entire image.

I always try to work in greyscale because most colours contain R,G and B. So when you set a sensitivity at, say 10pix, the R,G and B components will each react differently and no-one can get a clear view of what this exactly will do to the image.