OMG! First , I watched your video, then I made coffee and watched your video again 20 times because it was pure joy!
And I asked myself, how did you know what I was dreaming about colour selection tool? Yes, yes yes! That's it!
Only one suggestion - it would be good to have possibility to select one or more areas of photo first and than apply colour masking on that area(s) to avoid selection of colours from objects with same or similar colours that you don't need (f.e. if I only want to select colours from the door of your car in video and leave the rest of the car transparent).
But that is not so important. Your new filter works great!
And you have one big hot chocolate from me!
Thanks a lot, David!