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I'm no photoshop expert and most probably there are better ways to do better job... but here's how I do it:
1 - MAGNETIC LASSO TOOL- click once on any point of the rim and go around it slowly, it'll automaticly mark a point on the "Edges.
2 - COPY & PASTE
3 - make sure you paste it as a NEW LAYER, so that you can Swtich it ON & OFF (by clicking on the "Eye") to compaire the difference easily
4 - HUE & SATUATION - under Image -> Adjustments
5 - I bring down the SATURATION all the way (-100) to take out all color information; and turn down the LIGHTNESS
(you can play around with "BRIGHTNESS / CONTRAST" as well)
Good luck.
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