yes it should be possable to save as JPEG, im thinking you will need to load the image to be converted with a dll so that you have a pointer to the image in memory, as i think that when blitz loads images it returns a pointer to an internal blitz struct that handels the image data.
But what is the best dll librarie ? GFL librarie is not light and difficult to use : I should to create e pointers variables params to save image, can i create a variable pointer with BlitzPlus ?