Filter or Sort by Color Labels

Haven't tried this in 2019 yet, but I was in a large folder trying to find unlabeled images. If I filter by any color, it works fine. If I choose the unlabeled, it shows everything in the folder. I also tried sorting by color label and it did nothing. 

Also, I wanted to search on this, but couldn't find a search function for the forums. The search window above apparently only searches KB articles. 

Edit: Trying it in 2019. It seems to be trying. The folder has 4K images and while selecting any color is instant, selecting no label seems to be looking at each image to see if there is no label. Screen looks like a pinball machine with thumbs flashing on and off all over the screen. Been running for 15 minutes so far. 2018, still just ignoring the filter.

Ok, took almost an hour to pull 20 unlabeled images out of the 4,000. It seems like from a database perspective, color labels would be an integer, if not a bit. So indexing and looking for a value of 0 shouldn't take any longer than looking for a value of 7