I have previously reflected on what a shame it is that some of the classic old spanko movies/videos can't be brought up to contemporary production standards - thinking of the classic Debbie ones from NuWest for example.
The same is true for still images - now that computer memory and storage is cheap we can have large high quality colour images whereas in the past we had to make do with a lot of monochrome. Some were clearly never even made in colour - in other cases, it was too expensive to use all colour images in printed magazines. Typical issues of Roué and Janus only had around eight pages of colour out of maybe 64 pages in total, and that included the pretty uninteresting back cover.
However, the technology does now allow us to do something about that - with varying success. There are plenty of packages around to manipulate graphic files, and some that specifically exist solely to allow you to 'colorise' monochrome images. I tend to use Adobe Photoshop and have had some good results and some less good.
I'll start with a couple of examples from Janus. Neither are total disasters but the first example is pretty poor - it certainly doesn't do anything to make the image more attractive or interesting. The second is somewhat better - perhaps unusually so, given that one of the things the Colorize function seems to struggle with is pictures of multiple people with different skin tones - it typically seems to get one right and the other is poor. Clearly in the fourth image shown here, the first girl's bottom is a bit light in colour but that could probably be further adjusted if it really mattered to you.
Moving to an example from Roué...