Class GifWriter

ij/src/main/java/ij/plugin/GifWriter.java:14–144

Saves the active image in GIF format, or as an animated GIF if the image is a stack.

/** Saves the active image in GIF format, or as an animated GIF if the image is a stack. */
public class GifWriter implements PlugIn {
	static int transparentIndex = Prefs.getTransparentIndex();
	private boolean showErrors = true;
	private String error;
		
	/** Saves the specified image in GIF format or as an animated GIF if the image is a stack. */
	public static String save(ImagePlus imp, String path) {
		if (imp==null)
			imp = IJ.getImage();
		if (path==null || path.length()==0)
			path = SaveDialog.getPath(imp, ".gif");
		if (path==null)
			return null;
		GifWriter gf = new GifWriter();
		//gf.showErrors = false;
		gf.run(imp, path);
		return gf.error;
	}

	public void run(String path) {
		ImagePlus imp = IJ.getImage();
		if (path==null || path.equals("")) {
			SaveDialog sd = new SaveDialog("Save as Gif", imp.getTitle(), ".gif");
			if (sd.getFileName()==null) return;
			path = sd.getDirectory()+sd.getFileName();
		}
		run(imp, path);
	}

	@AstroImageJ(reason = "Add ability to return to original slice", modified = true)
	private void run(ImagePlus imp, String path) {
		ImageStack stack = imp.getStack();
		Overlay overlay = imp.getOverlay();
		int nSlices = stack.size();				
		if (nSlices==1) { // save using ImageIO
			if (overlay!=null && !imp.tempOverlay())
				imp = imp.flatten();
			try {
				writeImage(imp, path, transparentIndex);
			} catch (Exception e) {
				String msg = e.getMessage();
				if (msg==null || msg.equals(""))
					msg = ""+e;
				error = msg;
				if (showErrors) {
					msg = "An error occured writing the file.\n \n" + msg;
					if (msg.contains("NullPointerException"))
						msg = "Incorrect file path: \""+path+"\"";
					IJ.error("GIF Writer", msg);
					showErrors = false;
				}
			}
			return;
		}		
		AnimatedGifEncoder2 ge = new AnimatedGifEncoder2();
		if (!ge.setoptions())
			return;
		double fps = imp.getCalibration().fps;