Efficient Black/White Colormap plot

Specific Domains Visualization
1

I’m trying to efficiently create visualizations of a 2D Ising model (i.e., see Ising model - Wikipedia). Using Julia plots contour seems wasteful, and is definitely slow. Is there some simple black/white plot that could be used?

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2

heatmap?

heatmap(rand(0:1, 500,500), c=cgrad([:black, :white]))

image

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