private void setContrast(int contrast) {
			origContrast = Math.max(-100, Math.min(100, contrast));
			this.contrast = origContrast / 100f;
		}
@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