private void setAlpha(int alpha) {
			this.alpha = Math.max(0, Math.min(100, alpha));
		}
@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