I only allow to upload images of up to 640 in max dimension. The middle images turn out to be just the same as full-size, only slightly worse in quality. Can I disable middle size images to save hosting space?
Where is this option?
I only found an option to "Save and display medium and large images?" in Upload options. When I select "no" there I can only see small thumbnails.
EDIT:
I think I found it:
I need to set "Trigger medium graphic height and width" to the same size as the maximum upload size. I hope this works.