Slideshow scaling images

Hi everyone!

I’m having a problem with a slideshow that I’m developing…

I need to do a slideshow like this one: http://www.mutabor.de/#/de/white/h/0/0/

the problem is that when I scale the images they star shaking an have really bad quallity… the images have the size of 955x600… Should I use bigger images and then scale them to the stage size instead of using the 955x600 size?

thanks in advance

Cátia