How do I Clamp colors in Drawing Canvas?

Your issue isn't clear to me. What do you mean by clamp colors?

Perlin noise is a gradient by nature, why are you drawing a gradient instead of the actual value at each coordinate??

Sounds like you already know how to do it?

Change the set value action in event 4 to:

Set Value to AdvancedRandom.Classic2d(x1,y1)>0.5?1:0

Sure. But that Will only Work for the Perlin noise map. I need to do it for the linear gradient too.

If it's greyscale, you can loop through each snapshot pixel again to apply the conditional clamp. Use any of red/blue/green since they should always be the same in greyscale. Set snapshot pixel SnapshotRedAt(x, y)>50?100:0 for each color, or set an intermediate local variable to make it cleaner.

Alternatively, you can simply use the blackwhite layer effect.

Ah ok, thanks mate. 🙏☺️