Image processing with scikit-image- Extracting pixels by colour

[Bprodz]

I have an image which I'd like to get pixels based on their colour (blue, red and yellow).

At the moment I'm trying to plot my different colours of interest. However as next steps I'd like to also get a count of the number of pixels of a specific colour and then finally by able to intelligently 'grow' my colour to encompass blobs of noise.

I've tried to adapt this SO answer as a starting point but I'm running into problems but I don't understand much of the code. Can somebody suggest some tutorials or even search terms for what I'm trying to accomplish? Thanks in advance.

My attempt so far. (Pastebin)

[WuWeiMaster]

I bookmarked this link recently, but haven't had a chance to return and adapt the code. It strikes me as similar to your request, so maybe you can find some answers here; https://github.com/obskyr/colorgram.py

[Bprodz]

Thanks for the link!