diff -r fca460b63839 -r 91fb907a8732 jdk/src/java.desktop/share/classes/javax/imageio/plugins/tiff/TIFFImageReadParam.java
--- a/jdk/src/java.desktop/share/classes/javax/imageio/plugins/tiff/TIFFImageReadParam.java	Mon Dec 12 20:54:41 2016 -0800
+++ b/jdk/src/java.desktop/share/classes/javax/imageio/plugins/tiff/TIFFImageReadParam.java	Tue Dec 13 12:02:37 2016 -0800
@@ -46,6 +46,10 @@
  * {@code ExifParentTIFFTagSet}, and {@code GeoTIFFTagSet}
  * are included.
  *
+ * <p> Forcing reading of fields corresponding to {@code TIFFTag}s
+ * not in any of the allowed {@code TIFFTagSet}s may be effected via
+ * {@link #setReadUnknownTags setReadUnknownTags}.
+ *
  * @since 9
  */
 public final class TIFFImageReadParam extends ImageReadParam {
@@ -53,6 +57,8 @@
     private final List<TIFFTagSet> allowedTagSets =
         new ArrayList<TIFFTagSet>(4);
 
+    private boolean readUnknownTags = false;
+
     /**
      * Constructs a {@code TIFFImageReadParam}.  Tags defined by
      * the {@code TIFFTagSet}s {@code BaselineTIFFTagSet},
@@ -117,4 +123,27 @@
     public List<TIFFTagSet> getAllowedTagSets() {
         return allowedTagSets;
     }
+
+    /**
+     * Set whether to read fields corresponding to {@code TIFFTag}s not in
+     * the allowed {@code TIFFTagSet}s. The default setting is {@code false}.
+     * If the TIFF {@code ImageReader} is ignoring metadata, then a setting
+     * of {@code true} is overridden as all metadata are ignored except those
+     * essential to reading the image itself.
+     *
+     * @param readUnknownTags Whether to read fields of unrecognized tags
+     */
+    public void setReadUnknownTags(boolean readUnknownTags) {
+        this.readUnknownTags = readUnknownTags;
+    }
+
+    /**
+     * Retrieve the setting of whether to read fields corresponding to unknown
+     * {@code TIFFTag}s.
+     *
+     * @return Whether to read fields of unrecognized tags
+     */
+    public boolean getReadUnknownTags() {
+        return readUnknownTags;
+    }
 }