Resampling/upsampling batches of old small images; best method?

Question

I've got tons of old, small images. On today's monitors they obviously are rather small. The quality wasn't particularly good by today's standards, of course, but many are still worth looking at. To view them effectively, especially in slide shows with more modern, bigger images, it helps to enlarge them. But a simple scaling on a monitor (like "view 200%") looks pretty bad. Upsampling a copy of the image (and most are JPEG, although some TIFFs) would seem to produce better result. And make it easier to use the images in slide shows, web, etc. So I'd like to batch resize a bunch.

I'm wondering what others have done. Which upsampling algorithm works best, over all? I've got all types of small images; does the content (like BW, landscape, etc) matter much? Should I do any preprocessing first, or after? Some of these older JPEGs already tend to wanna show banding, for example. And any good tools besides Ps out of the box for this?

robgendreau · Accepted Answer

Okay. You'd asked what others had done. I hope you find someone who can offer something better for you.

I agree keeping hi res files and shooting replacements is nice. But unfortunately I haven't found a time machine to do that . These are historical images, some going back almost 15 years and sub-2MP, even before they were cropped. As well as old scans from small prints, which are now lost to us.

We've been trying other tricks; you can sometimes actually get a nicer upsampled print than you get from just exporting a resized digital file. Probably cuz some printer drivers are very good at sampling and they're not confined to digital pixels. We then rescanned those; can make a nice effect. But it's too time consuming. With some resizing and some work to make them look kind of retro helped. For our purposes a bit soft and even kinda out of focus works far better than any pixellation. From the context and the content one knows they're old, so people aren't expecting pixel-peepring sharpness. Especially when viewed via projector, as S_Gans noted. And BTW, thanks for the On1 suggestion, that's why I tried it. Just didn't give us appreciably better results on the trials.

Nancy OShea · Answer

This underscores why you need to keep original hi-res PSD files. It's much better to start with high quality images and ExportAs a smaller JPG. The reverse will never produce good results.

If you don't have good quality originals, you may need to find or shoot some replacements.

Nancy

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