Created Unassigned: Thumbnails of multimedia content [1702]

Hi,
I have seen that there are two packages that use thumbnails, http://www.composite.net/Add-on-Market/Packages/Composite.Media.ImageGallery.Slimbox2/UserManual and http://www.composite.net/Add-on-Market/Packages/Composite.Media.NivoSlider/UserManual.

These packages uses the original image and rescale it (by code) depending on the size. There is any solution that creates a copy of the original file and save it with an specific thumbnail specification?
Thanks