You may want to have a look at:

This is a very nice tutorial on how to convert jpeg to gif thumbnails from
the command line -- hence can be scripted.

On Thu, 25 Jan 2001, Mick Raynes wrote:

> 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
> Cheers
> Mick

Jim Freeze
** **

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