more on image export

Hi

I have been experimenting with the image export action in the scripts. One issue that has come up is determing the image file format (gif, bmp, jpeg etc) at time of export as I will not know what format has been used for each image. The Export image file action requires you to give a filename without knowing the format. So my query is how to determine the image format at time of export so the correct file extension can be used.

Thanks.

Matty