Can anyone offer us assistance with converting/saving a jpg image as png?

We have around 5000 images which come in at around 150kb each.  We are
hoping to convert the images to png because down the track we are hoping to
convert them to thumbnails on the fly.  The images will only be presented on
the net (assume browser capability)and it is pretty important that we retain
colour and shadow integrity.  We have limited experience with Gimp however
we are pretty confident that it will fit the bill and that once we determine
the process we will be able to batch convert the images.  The original jpg's
are not all in the same format as they are taken with different digital
cameras with different settings.  Our aim would be to reduce the original
jpg 1000 by 1000 and 120kb (as an eg) to a png 500 by 500 and about 30kb.
As an example we have posted an original jpg image on the net at


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