void writePNG(const String& filename)
{
	Vector<Color> pal;
	pal.Add(Color(0,0,0));
	
	PixelArray pix(100, 100, 8, 1, NULL, pal);
	
	for (int i=0; i<10000; ++i)
		pix.pixels[i] = 0;
	
	Image img = PixelArrayToImage(pix);
	PngEncoder::New()->SaveImageFile(filename, img);
}