Re: OT: Having fun with pictures
Cleaning up noise is a one by one operation, but resizing (assuming you just want the originals all downscaled directly without any cropping) and converting file formats are all batch operations. Doing those parts one by one is pretty silly IMO. Any noise created by conversion would have to be cleaned up one by one either way, and for reduced size web site pics it probably won't be that noticeable. Just make sure to save lossless (PNG) copies before the conversion to smaller jpgs as David suggests.
Photoshop and The GIMP (free) support batch processing, and I believe that Paintshop Pro might as well.
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