applescript: capture image frm Wirecast, convert image to jpeg, overwrite image every 15sec, w/ scheduled ftp upload every 15sec

Hi - I've got this very simple script and now I would like it to do three more things:
convert image from tiff to jpg, grab a new image every 15 secs from a streaming video, and FTP uploading to my server. The image can be overwritten
since FTP uploading should cycle & catch the replaced image every 15 sec.

tell application
"Wirecast"
tell last document to save snapshot to "/Users/BirdBox/Desktop/snapshot.tiff"
end tell

Can I use the code to convert the images as described above? Where can I get this code. Then is it possible to set up one of the ftp droplets to automatically check for a new image.

Thanks for any help!
Kata