Method toggleChannel

ij/src/main/java/ij/macro/Functions.java:5705–5716

(ImagePlus imp, int channel)

	}

	void toggleChannel(ImagePlus imp, int channel) {
		if (!imp.isComposite())
			interp.error("Composite image required");
		if (channel<1 || channel>imp.getNChannels())
			interp.error("Invalid channel: "+channel);
		if (((CompositeImage)imp).getMode()!=IJ.COMPOSITE)
			((CompositeImage)imp).setMode(IJ.COMPOSITE);
		boolean[] active = ((CompositeImage)imp).getActiveChannels();
		active[channel-1] = active[channel-1]?false:true;
		imp.updateAndDraw();
		Channels.updateChannels();
	}

	void setDisplayMode(ImagePlus imp, String mode) {
		mode = mode.toLowerCase(Locale.US);