jodd-core/src/main/java/jodd/chalk/Chalk256.java
private int index(int index, final int from, final int to) {
		index += from;
		if ((index < from) || (index >= to)) {
			throw new IllegalArgumentException("Color index not in range: [0, " + (to - from) + "]");
		}
		return index;
	}
private int index(int index, final int from, final int to) {
		index += from;
		if ((index < from) || (index >= to)) {
			throw new IllegalArgumentException("Color index not in range: [0, " + (to - from) + "]");
		}
		return index;
	}
---------------------------------------------------------------- bgcolors