Silverlight signature to png scripts

We are looking for a small silverlight ink canvas for signatures (? including pressure sensitive input ) which will then with an external script create the signature into a png or similar. ? We are using a linux platform with mysql, php etc. however we could possibly use a MS platfrom if absolutely necessary. ? So what we reuire is : Silverlight canvas for signature export of signature to xaml Scripts to pull xaml and create image as the signature showed in silverlight canvas. Or if there any better suggestions we are welcome to hear them.