Image File Size Reduction

[Ray]

Does anybody know of a way to reduce an image's disk size from within 
Livecode?

Specifically, I'd like to be able to:
    1)  change the file from PNG to JPEG
    2)  change the color depth for PNG's to 8 bit
    3)  change the dimensions

Regarding the last of these I know you can set it up and take a snapshot 
but I was kind of looking for a way to do all three of these without a 
lot of fussing around.

If not, does anybody know of any command line tools which will do this?  
Image Magick works but I don't believe they have a command prompt 
version.  Very PDF has a product named Document Converter but it only 
does #1.

Many Thanks!