src/java.desktop/share/classes/javax/imageio/plugins/tiff/TIFFField.java

@@ -1087,10 +1087,19 @@
      * are treated as unsigned; that is, no sign extension will take
      * place and the returned value will be in the range [0, 255].
      * {@code TIFF_SBYTE} data will be returned in the range
      * [-128, 127].
      *
+     * <p> Data in {@code TIFF_FLOAT} and {@code TIFF_DOUBLE} are
+     * simply cast to {@code long} and may suffer from truncation.
+     *
+     * <p> Data in {@code TIFF_SRATIONAL} or
+     * {@code TIFF_RATIONAL} format are evaluated by dividing the
+     * numerator into the denominator using double-precision
+     * arithmetic and then casting to {@code long}.  Loss of
+     * precision and truncation may occur.
+     *
      * <p> Data in {@code TIFF_ASCII} format will be parsed as by
      * the {@code Double.parseDouble} method, with the result
      * cast to {@code long}.
      *
      * @param index The index of the data.

@@ -1110,10 +1119,14 @@
         case TIFFTag.TIFF_SLONG:
             return ((int[])data)[index];
         case TIFFTag.TIFF_LONG:
         case TIFFTag.TIFF_IFD_POINTER:
             return ((long[])data)[index];
+        case TIFFTag.TIFF_FLOAT:
+            return (long)((float[])data)[index];
+        case TIFFTag.TIFF_DOUBLE:
+            return (long)((double[])data)[index];
         case TIFFTag.TIFF_SRATIONAL:
             int[] ivalue = getAsSRational(index);
             return (long)((double)ivalue[0]/ivalue[1]);
         case TIFFTag.TIFF_RATIONAL:
             long[] lvalue = getAsRational(index);