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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: 1.54m

package ij.plugin;
import ij.*;
import ij.process.*;
import ij.gui.*;
import ij.util.Tools;
import ij.io.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;

/** This plugin implements the File/ /Convert command, 
	which converts the images in a folder to a specified format. */
	public class BatchConverter implements PlugIn, ActionListener {
		private static final String[] formats = {"TIFF", "8-bit TIFF", "JPEG", "GIF", "PNG", "PGM", "BMP", "FITS", "Text Image", "ZIP", "Raw"};
		private static String format = formats[0];
		private static double scale = 1.0;
		private static boolean useBioFormats;
		private static int interpolationMethod = ImageProcessor.BILINEAR;
		private static boolean averageWhenDownSizing;
		private String[] methods = ImageProcessor.getInterpolationMethods();
		private Button input, output;
		private TextField inputDir, outputDir;
		private GenericDialog gd;

	public void run(String arg) {
		if (!showDialog())
			return;
		String inputPath = inputDir.getText();
		if (inputPath.equals("")) {
			IJ.error("Batch Converter", "Please choose an input folder");
			return;
		}
		String outputPath = outputDir.getText();
		if (outputPath.equals("")) {
			IJ.error("Batch Converter", "Please choose an output folder");
			return;
		}
		File f1 = new File(inputPath);
		if (!f1.exists() || !f1.isDirectory()) {
			IJ.error("Batch Converter", "Input does not exist or is not a folder\n \n"+inputPath);
			return;
		}
		File f2 = new File(outputPath);
		if (!outputPath.equals("") && (!f2.exists() || !f2.isDirectory())) {
			IJ.error("Batch Converter", "Output does not exist or is not a folder\n \n"+outputPath);
			return;
		}
		String[] list = (new File(inputPath)).list();
		IJ.resetEscape();
		Opener opener = new Opener();
		opener.setSilentMode(true);
		long t0 = System.currentTimeMillis();
		for (int i=0; i