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kotlinlang

sorry, I'm a bit rusty on computer graphics. what's the easiest way to color a grayscale bitmap? I'm assuming using the `ColorFilter` but what to use as matrix?

This looks good:

```Matrix3D.fromColumns(
    color.rd, 0.0, 0.0, 0.0,
    0.0, <http://color.gd|color.gd>, 0.0, 0.0,
    0.0, 0.0, <http://color.bd|color.bd>, 0.0,
    0.0, 0.0, 0.0, 1.0
)```

<https://github.com/korlibs/korge/blob/master/korge/src/commonMain/kotlin/com/soywiz/korge/view/filter/ColorMatrixFilter.kt#L23>

```ColorMatrixFilter(ColorMatrixFilter.GRAYSCALE_MATRIX)```
