private void setBrightness(int brightness) {
			origBrightness = Math.max(-100, Math.min(100, brightness));
			this.brightness = (float)(Math.pow(origBrightness, 3) / (100f * 100f)); // cubic in [0..100]
		}
@param brightness in range [-100..100] where 0 has no effect
@param contrast in range [-100..100] where 0 has no effect
@param alpha in range [0..100] where 0 is transparent, 100 has no effect
flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatDisabledIconsTest.java