colorgram.extract(img_path, n) returns less than 'n' number of colors for certain images

[rishabh00100]

When we run colorgram.extract(img_path, n) for images like THIS for n=6, we get 2-3 colors in return

I understand that these kind of images have lesser color information, but is there any way that colorgram.extract returns exactly n number of colors for all images?

[earthbound19]

Similarly, if I give it an image with a grid of 199 distinct colors, and ask for 199 colors, it returns 25 colors.