Color Codes for RGB LED Matrix w/driver

Hi, A question about the color codes for the RGB LED matrix. Looking at the example files in the library, it indicated some color codes. E.g. 0xff is black. Does this 4character color code relate to the #000000 black hex code in any way? Or how do I arrive at these codes from RGB values? For example, is it possible to get 2 or even 3 visibly different shades of blue (light, medium, dark blue)? Thanks!

Color is defined here, and it can’t be represented in 3 bytes.It should be a byte.

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