2. Click in the layer palette "channels" and select the "Lightness" channel
3. Select All and copy the selection
4. In channels palette click little arrow on right hand side "new channel" -> just click O.K. then -> edit ->paste -> rename channel "sharp" by double clicking on Alpha
5. Keep that channel selected and use the Find Edges filter (Filter -> stylize -> find edges)
6. Adjust the images levels so that you get a nice strong contrast (Image -> adjustment -> levels 'left arrow: pull it towards the middle')
7. Stay on that channel and apply the Gaussian blur filter with a radius of 1 (Filter -> blur ->gaussian blur)
8. Still on same channel go back into image -> adjustments -> levels: fine tweak the contrast once more
9. In channel list select the lightness channel
10. Go to select -> load selection -> "sharp" with invert ticked
11. Now apply the unsharp mask filter (Filter -> unsharp mask) with these settinga around 300 % radius 1 threshold 4
12. Go back into your channel palette and delete channel "sharp"
13. Click RGB in channel pallet
14. Click select -> deselect
15. Convert back to RGB (Image ->mode -> RGB)