Make This:
to
START:
DUPLICATE LAYER
SET DUPLICATE LAYER TO SCREEN
MERGE LAYERS
IMAGE > ADJUSTMENTS > SELECTIVE COLORING
RED:
-100
0
+100
+8
YELLOW:
+100
0
-79
-100
WHITE:
+100
+100
-100
-100
NEUTRALS:
+100
0
-52
-22
THEN GO TO FILTER> SHARPEN > SHARPEN.
FINISH:
(and if you're lazy like moi, here is the selective coloring to download!)
download here