Assuming that your photo is "normal" digital photo dimensions, make the longest side 5025 and it's 48.2 megapixels. Easy. You could probably use Irfanview and batch resize/rename files and not have them get ruined.

Since I do uploads of 10-12 photos or less, I don't use that method. I also make sure I do levels on each image before I resize, so I'm already in Elements. But if you have finished photos, upsizing isn't magic. Irfanview resamples the images, for better quality.

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