All in all, it's a very handy script.

My issue is - I'm using it not only to cut to size, but also to save on bandwidth.
I ran the function on several images for several preset sizes.
In some cases, the output is the same dimension as the original, but the output size was x3 - x4 the size.
(e.g. - real example: original 59kb; output 198kb . See attachments below.)

The compression needs to be improved.

Thanks!

original:

resized: