How to restore old yellowed photo

[Stephen Liu]

(09-29-2023, 11:02 PM)Ofnuts Wrote: Are they really color photos? The histograms of the R/G/B channels look very similar, just shifted/stretched. So when you equalize the channels the 3 channels pretty overlap which usually means that the picture is grayscale:




Also, the gaps in the histogram hint that some processing has been done already?

The photo was displayed on the website and taken running screen shot.  If I download it on website the photo is very small therefore after incrasing its size on browsing I captured the photo in .png with screenshot.

Regards

Edit
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I attach the file here which was download direct on the website