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ImageJ is an open source Java image processing program inspired by NIH Image for the Macintosh.
There is a newer version: 1.54p
package ij.plugin;
import ij.*;
import ij.process.*;
import ij.gui.*;
import ij.io.*;
import ij.util.Tools;
import java.awt.*;
import java.io.*;
import java.util.*;

/** This plugin opens images specified by list of file paths as a virtual stack.
	It implements the File/Import/Stack From List command. */
public class ListVirtualStack extends VirtualStack implements PlugIn {
	private static boolean virtual;
	private String[] list;
	private String[] labels;
	private int nImages;
	private int imageWidth, imageHeight;
	private ImagePlus imp2;

	public void run(String arg) {
		OpenDialog  od = new OpenDialog("Open Image List", arg);
		String name = od.getFileName();
		if (name==null) return;
		String  dir = od.getDirectory();
		//IJ.log("ListVirtualStack: "+dir+"   "+name);
		list = open(dir+name);
		if (list==null) return;
		nImages = list.length;
		labels = new String[nImages];
		//for (int i=0; inImages)
			throw new IllegalArgumentException("Argument out of range: "+n);
		if (nImages<1) return;
		for (int i=n; inImages)
			throw new IllegalArgumentException("Argument out of range: "+n);
		IJ.redirectErrorMessages(true);
		String url = list[n-1];
		ImagePlus imp = null;
		if (url.length()>0)
			imp = IJ.openImage(url);
		if (imp!=null) {
			labels[n-1] = (new File(list[n-1])).getName()+"\n"+(String)imp.getProperty("Info");
			ImageProcessor ip =  imp.getProcessor();
			int bitDepth = getBitDepth();
			if (imp.getBitDepth()!=bitDepth) {
				switch (bitDepth) {
					case 8: ip=ip.convertToByte(true); break;
					case 16: ip=ip.convertToShort(true); break;
					case 24:  ip=ip.convertToRGB(); break;
					case 32: ip=ip.convertToFloat(); break;
				}
			}
			if (ip.getWidth()!=imageWidth || ip.getHeight()!=imageHeight)
			ip = ip.resize(imageWidth, imageHeight);
			IJ.redirectErrorMessages(false);
			if (imp2!=null)
				imp2.setFileInfo(imp.getOriginalFileInfo());
			ip.setSliceNumber(n);
			return ip;
		} else {
				ImageProcessor ip = null;
				switch (getBitDepth()) {
					case 8: ip=new ByteProcessor(imageWidth,imageHeight); break;
					case 16: ip=new ShortProcessor(imageWidth,imageHeight); break;
					case 24:  ip=new ColorProcessor(imageWidth,imageHeight); break;
					case 32: ip=new FloatProcessor(imageWidth,imageHeight); break;
				}
			IJ.redirectErrorMessages(false);
			ip.setSliceNumber(n);
			return ip;
		}
	 }
 
	 /** Returns the number of images in this stack. */
	public int getSize() {
		return nImages;
	}

	/** Returns the name of the specified image. */
	public String getSliceLabel(int n) {
		if (n<1 || n>nImages)
			throw new IllegalArgumentException("Argument out of range: "+n);
		if (labels[n-1]!=null)
			return labels[n-1];
		else
			return (new File(list[n-1])).getName();
	}
	
	public int getWidth() {
		return imageWidth;
	}

	public int getHeight() {
		return imageHeight;
	}
	
	@Override
	public void reduce(int factor) {
		if (factor<2 || nImages/factor<1)
			return;
		nImages = nImages/factor;
		for (int i=0; i