multi color brayer matrix for a Coding challange?

I had this idea because I haven’t found any good Brayer matrix functions that let you work with a custom color array instead of just sticking to the typical R, G, B values that are either 0 or 255. Usually, the threshold is applied like this:

```
const threshold = ditherMatrix[x % 4][y % 4] / 15;
let newR = r > threshold * 255 ? 255 : 0;
let newG = g > threshold * 255 ? 255 : 0;
let newB = b > threshold * 255 ? 255 : 0;
```
This limits the colors to either full on or off, but I wanted a way to use more nuanced colors and still get that cool dithered effect, like using a set color array instead.