You must install the filter almathera
Filter
This filter also includes warp, drop shadow, beveller, halo, grey area, lightining maker and shape cutter
Once you have the filter installed to your plug-in folder for PSP.
Or use this one by right click and save picture as.
to isolate an area.
I've isolated the bottom of this image.
You can use these settings or adjust.
Here is what you should see after.
This tutorial was written by ForTe