You couldn't raise the resolution in Photoshop. If the pictures are low-resolution, there's no magic way to make them high resolution.
You can use Adobe Bridge to select images, and choose Tools > Photoshop > Image Processor to make pictures a certain pixel dimension, but I'm not sure if that's what you want.
Thanks Steve, I know that's not possible -unless you're a CSI cop/nerd- but resampling images works fine to me -within a 20-30% range-, and the typical client who wants to use coin-sized pics to wrap the moon feels happy. I think batch processing them with Photoshop could be the short-term fastest solution to me, maybe someday I'll try to automate that.
Thanks again Steve!
You can batch resize (and more) with the Photoshop Image Processor script.
Thanks Derek, but I prefer using Image Processor Pro script, that works way better than the native Image Processor