It’s actually really cool. It’s called Photomyne and it lets you scan bulk photos and it automatically detects the individual pix, separates them, restores them, and saves them in the app. It also lets you attach the back of the photo, let’s you add details, and has the colorize option. Source: about 2 years ago

If the picture is of law quality or scratched try to improve it before colorizing. You can do it using Photoshop or GIMP (HSV contrast, white balance, noise reduction, etc.) or use an online tool. I can recommend You the three following: https://imagecolorizer.com/repair.html, https://www12.lunapic.com/editor/, https://hotpot.ai/restore-picture?s=side-ad. Hard to say which one is better, depends always on picture... Source: almost 3 years ago

It's a great idea, I absolutely second this. The only problem is that grandma's photo may be too old and faded, in this case you'll have to use something like Photoglory or ImageColorizer to restore it and probably add some color. Source: about 3 years ago