Best way to scale up an image

[moens]

I need to scale a bunch of product images from 350px on longest side to 500px on longest side. The images are basically snapshots on white backgrounds.

Is there a recommended best "scale up" method that will give me (I hope) an image that is not just a poke in the eye? It also needs to have no edge artifact (white to the edge, no artifact at the edges of the image is very important).

TIA

[fmw42]

use -resize with the default -filter. or experiment with -filter. each type of image may need a different type of filter. this is really all subjective. so you have to be your own judge.

see
http://www.imagemagick.org/Usage/filter/
http://www.imagemagick.org/Usage/filter/nicolas/

The latter gives recommendations for the types of artifacts that one might want to deal with. You trade different types of artifacts vs sharpness or blurring

[moens]

Sweet. I already thought the basic -resize did an amazingly good job, but those two links are what I was looking for.

Thanks!