Because the source of the SW letterbox laserdiscs aren't in a true 2.35:1 aspect ratio I had to do some calculating when rescaling to anamorphic so everythign looks fine, I've taken that one step further and been working on more aspect ratio calculation and finally started putting them into some javascript, this is my first stab at coding javascript so you'll have to bear with me

ARCT - Aspect Ratio Calculator Tool

It's just at the first stage of completion, calculation of the aspect ratio, the next stage I'll be adding is outputting the rescaling needed for if you want to output it as PAL or NTSC which is letterboxed or anamorphic, including what size borders to add.

Any comments or helpful hints most welcome.

edit: now completed