What produces best thumbnails programmaticly

Good evening,

Windows 2000, JDK 1.5.

What opinions do people have on what way and tool programmaticly produces
the best quality thumbnails from larger images?

On the web I've seen Java Advanced Imaging (JAI), ImageMagick, and GIMP all
praised as best in different places.

Is there another tool or other better solution?

Can anybody point to a superior JAI implementation, if that's considered
best?

Many thanks,
Ron


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