:: tutorial .008
Start with your base, and sharpen.
Duplicate once and set to screen 100%, or something that suits your icon.
Flood fill with #030015 or any dark blue color, set to exclusion 100%.
=
New curves layer.
Red
First Point
IN-156 OUT-184
Second Point
IN-103 OUT-86
Blue
First Point
IN-156 OUT-179
Second Point
IN-38 OUT-81
Green
IN-158 OUT-192
Second Point
IN-44 OUT-62
And you will get this:
And that's done.