lips editing

i was doing some editings on a portratit and was looking at a way to put some gloos effect on .
one that kept coming up was filter -artistic -plastic wrap

now i make my selection around lips with pen tool but when go to filter artistic is greyed out and i cant cant select it there are others in bold but i dont know why i cant select the one i want any ideas.

cheers shane

You're image is probably 16bit and not all filters will work on a 16bit image. Change to 8bit and should be fine.

ok thanks for that i will give a it a go.
cheers shane