I've got to resize a lot of .jpg photos for my online shop, so I use the following command while in a directory filled with the photos to resize:
mogrify -resize 150x200 *.*
This leaves me with the desired sized pictures, but they're too big in terms of file size. If I go into Gimp, I can reduce the quality to 40 and it's not noticeable, yet the file size is many times smaller.
So my question is: Is there some other switch for mogrify that I can use to change the quality level of my jpgs?
I've read the man and help for it, but I can barely understand about half the options.

As far as I understand, convert will do what I'm looking for, but I was curious if it's possible with mogrify.
Thanks for any info,
Baltika