ImageJ exporter: save original metadata

Fixes ome#4201.

components/bio-formats-plugins/src/loci/plugins/out/Exporter.java

@@ -52,6 +52,7 @@
 import java.io.File;
 import java.io.IOException;
 import java.util.ArrayList;
+import java.util.Hashtable;
 import java.util.List;
 import java.util.Vector;
 
@@ -60,6 +61,7 @@
 import javax.swing.filechooser.FileFilter;
 
 import loci.common.DataTools;
+import loci.common.DebugTools;
 import loci.common.services.DependencyException;
 import loci.common.services.ServiceException;
 import loci.common.services.ServiceFactory;
@@ -538,6 +540,7 @@ else if (FormatTools.isSigned(originalType)) {
             }
 
             Object info = imp.getProperty("Info");
+            Hashtable<String, Object> originalMetadata = new Hashtable<String, Object>();
             if (info != null) {
                 String imageInfo = info.toString();
                 if (imageInfo != null) {
@@ -548,14 +551,22 @@ else if (FormatTools.isSigned(originalType)) {
                             String key = line.substring(0, eq).trim();
                             String value = line.substring(eq + 1).trim();
 
+                            originalMetadata.put(key, value);
+
                             if (key.endsWith("BitsPerPixel")) {
                                 w.setValidBitsPerPixel(Integer.parseInt(value));
-                                break;
                             }
                         }
                     }
                 }
             }
+            try {
+              service.populateOriginalMetadata(service.getOMEMetadata(store), originalMetadata);
+            }
+            catch (ServiceException e) {
+              IJ.log("Could not populate original metadata");
+              IJ.log(DebugTools.getStackTrace(e));
+            }
 
             // NB: Animation rate code copied from ij.plugin.Animator#doOptions().
             final int rate;