Fix: http://dev.exiv2.org/boards/3/topics/1337 extended to handle Exif.Pentax.Temperature. Thanks Norbert finding this.

src/tiffcomposite.cpp

@@ -1846,10 +1846,12 @@ namespace Exiv2 {
         if (tag == 0x9286 && group == exifId && ti == undefined) {
             ti = comment;
         }
-        // http://dev.exiv2.org/boards/3/topics/1337
-        // Exif.NikonAFT.AFFineTuneAdj should be signedByte
-        if ( tag == 0x0002 && group == nikonAFTId && ti == unsignedByte ) {
-            ti = signedByte;
+        // http://dev.exiv2.org/boards/3/topics/1337 change unsignedByte to signedByte
+        // Exif.NikonAFT.AFFineTuneAdj || Exif.Pentax.Temperature
+		if ( ti == Exiv2::unsignedByte ) {
+		    if ( (tag == 0x0002 && group == nikonAFTId ) || (tag == 0x0047 && group == pentaxId) ) {
+				ti = Exiv2::signedByte;
+			}
         }
         return ti;
     }