Unfortunately, writing an ImgPlus to OME-TIFF format with scifio-0.7.1 does not go off without a hitch.

output.txt

imgPlus = io.scif.img.SCIFIOImgPlus@3d31f2b4
numDimensions = 2
dim #0 = 512
axis #0 = X
dim #1 = 512
axis #1 = Y
Exception in thread "main" java.lang.NullPointerException
	at io.scif.util.FormatTools.checkPlaneParameters(FormatTools.java:492)
	at io.scif.AbstractWriter.checkParams(AbstractWriter.java:333)
	at io.scif.formats.TIFFFormat$Writer.savePlane(TIFFFormat.java:1207)
	at io.scif.formats.TIFFFormat$Writer.savePlane(TIFFFormat.java:1268)
	at io.scif.AbstractWriter.savePlane(AbstractWriter.java:110)
	at io.scif.img.ImgSaver.writePlanes(ImgSaver.java:512)
	at io.scif.img.ImgSaver.saveImg(ImgSaver.java:371)
	at io.scif.img.ImgSaver.saveImg(ImgSaver.java:124)
	at io.scif.img.ImgSaver.saveImg(ImgSaver.java:105)
	at WriteAnImgPlus.writeImg(WriteAnImgPlus.java:34)
	at WriteAnImgPlus.main(WriteAnImgPlus.java:13)

WriteAnImgPlus.java

import io.scif.SCIFIO;
import io.scif.img.ImgIOException;
import io.scif.img.ImgOpener;
import io.scif.img.ImgOptions;
import io.scif.img.ImgOptions.ImgMode;
import io.scif.img.ImgSaver;
import net.imglib2.exception.IncompatibleTypeException;
import net.imglib2.meta.ImgPlus;

public class WriteAnImgPlus {

	public static void main(final String... args) throws Exception {
		writeImg();
	}

	private static void writeImg() throws ImgIOException,
		IncompatibleTypeException
	{
		final SCIFIO scifio = new SCIFIO();
		final ImgOpener opener = new ImgOpener(scifio.getContext());

		// NB: ImgSaver only supports PlanarImg for now!
		final ImgOptions options = new ImgOptions().setImgModes(ImgMode.PLANAR);
		final ImgPlus<?> imgPlus = opener.openImg("stack&sizeZ=10.fake", options);

		System.out.println("imgPlus = " + imgPlus);
		System.out.println("numDimensions = " + imgPlus.numDimensions());
		for (int d=0; d<imgPlus.numDimensions(); d++) {
			System.out.println("dim #" + d + " = " + imgPlus.dimension(d));
			System.out.println("axis #" + d + " = " + imgPlus.axis(d).type());
		}

		final ImgSaver saver = new ImgSaver(scifio.getContext());
		saver.saveImg("stack.ome.tif", (ImgPlus) imgPlus);
	}

}