Setting colors and thresholds in canvas component with draw.image

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I am trying to draw an image with color thresholds in a canvas component using draw.image, but I can't seem to get the "colors" array passed in the correct format. What dimensions should the "colors" array be for passing RGB color codes? Thanks!

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It should be in the first dimension, so:

private colors
colors[0] = rgb(255,0,0)
colors[1] = rgb(0,255,0)
colors[2] = rgb(0,0,255)
private thresholds
thresholds[0] = 5
thresholds[1] = 12
thresholds[2] = 15

Draw.Image(..., colors, thresholds)


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