Saving an image in Silverlight with horizontal/vertical resolution other than 96DPI

[Hmongkeysauce]

I created a silverlight application to generate an image to be use in Outlook as a signature. The problem, however, is that some users have different DPI settings in Windows 7. Anything other than the normal setting blows up the image, which is the normal behavior in Outlook. Is there anyway for me to set the Horizontal and Vertical resolution setting in Silverlight while encoding the image? I'm using fjcore to encode the image as a jpg. FluxJpeg.Core.Image has a DensityX and DensityY property but setting those two properties to different values did nothing. Thanks.