// 38 = round(0.15 * 255)
assertEquals([0, 0, 255, 38], getPixel(imageData, 200, 250));
assertEquals([0, 255, 0, 38], getPixel(imageData, 200, 150));
// 38 = round(0.15 * 255)
assertEquals([0, 0, 255, 38], getPixel(imageData, 200, 250));
assertEquals([0, 255, 0, 38], getPixel(imageData, 200, 150));