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Irfanview
I found it:
-> File -> Batch Conversion/Rename
You just select output format (png) and the folder where you want to put the converted files (both option fields are on the left). Then select the files to be converted in the top right dialog box).
It looks like when you are done, you'll have the old pic files still in place and the new png pics in another file so a bit of delete / cut-n-paste will be needed to tidy up.
Edit - be sure to select/set up a different folder then where the old jpg files are to put the new png files at least temporarily. If you just create the converted files and dump them back in the folder that had the jpgs it might be a mess to clean up.
Last edited by CONN CHRIS; 09-12-2008 at 10:26 PM.
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