Colour pop is a photography term that is described as ‘a digital effect in which part of an image is shown in colour, the rest of the image being in grey or a dull monochrome’.
All in all it doesn’t sound too fancy. It is an effect that is used a lot in photography. Some might say it is being overused. It is not a difficult effect to achieve, many cameras and apps are designed to get the job done quickly and easily, and to give photos a dramatic look by converting them to grey or black and white, and keeping a select detail in colour.
However, even though it is considered a bit daggy by many photographers, it is very popular with the wider public. It is a fun look, that can be very effective. The viewers eye and attention is drawn to the coloured areas, making it altogether a striking image and a good experience for your eyes.
Naturally, I’ve played around with it, too, although trying to stay away from the cliche red umbrella in the black and white rainy landscape. It’s a fine line.
Using local scenes, this is some of what I’ve come up with so far.
azpictured.com.au 
Very interesting. The first is reminiscent of old postcards, and one could almost imagine the cars are 1950 models. The second is my preference. The reflection on the coloured timber really works for me!
Thank you Gwen, it was a very magical sunset. I couldn’t believe how ‘golden’ the glow was once I desaturated the rest of the image.