They sometimes say that the old software is the best software. Which in the case of this particular utility might well be true. It dates back to 2008, but it's still very clever and it works just fine under Windows 10.

Photo B&C (the B&C stands for Black And Colour) lets you take a colour image file and remove all of the colours except the ones you specify. All the others get converted to shades of grey. So you can make one particular part of the photo stand out, by retaining its colours, and allow the rest of the image to fade into the background.

In the example shown here, I took a photo of some multi-coloured eggs. By repeatedly clicking around just one of them, I was able to tell Photo B&C about the colours I wanted to keep, All the others were converted to black and white, as you can see in the lower half of the example.

This is a clever program, though it does take a little practice to get used to. But the effects are like nothing I've ever seen before.

You'll find Photo B&C at http://www.photofiltre-studio.com/freeware/photobc-en.htm and it's free. The download is 3 MB. It's malware-free according to VirusTotal and Web of Trust.