3D filter on hyperstacks

[jboulanger]

Hello,

I didn't find an opened issue on this so here it is. The filter3d function behaves differently on stacks and hyperstack in an unexpected way. Here is an example:

function test(type, nframes) {
	newImage("HyperStack", type + " grayscale-mode", 300, 200, 1, 10, nframes);
	for (t = 1; t <= 20; t++) {
		Stack.setFrame(t);
		for (z = 1; z <= 4; z++) {
			Stack.setSlice(z);
			makeOval(50, 50, 200, 100);
			setColor(1);
			fill();
		}
	}
	run("Select None");
	run("Maximum 3D...", "x=2 y=2 z=2");
	Stack.setFrame(1);
	Stack.setSlice(10);	
	val = getPixel(150,100);
	setMinAndMax(0, 1);
	if (val == 0) print(type + ", nframes :" +nframes + ": ok");
	else print(type + ", nframes :" +nframes + ": failed");	
}
run("Close All");
for (nframes = 1; nframes <= 3; nframes++) {
	test("8-bit",nframes);	
}