Merge pull request #1782 from radarhere/compression

Different frames may have different compression types

PIL/TiffImagePlugin.py

@@ -991,6 +991,11 @@ class TiffImageFile(ImageFile.ImageFile):
 
         return args
 
+    def load(self):
+        if self.use_load_libtiff:
+            return self._load_libtiff()
+        return super(TiffImageFile, self).load()
+
     def _load_libtiff(self):
         """ Overload method triggered when we detect a compressed tiff
             Calls out to libtiff """
@@ -1136,6 +1141,7 @@ class TiffImageFile(ImageFile.ImageFile):
         # build tile descriptors
         x = y = l = 0
         self.tile = []
+        self.use_load_libtiff = False
         if STRIPOFFSETS in self.tag_v2:
             # striped image
             offsets = self.tag_v2[STRIPOFFSETS]
@@ -1158,10 +1164,9 @@ class TiffImageFile(ImageFile.ImageFile):
                 # function.
                 #
                 # Setup the one tile for the whole image, then
-                # replace the existing load function with our
-                # _load_libtiff function.
+                # use the _load_libtiff function.
 
-                self.load = self._load_libtiff
+                self.use_load_libtiff = True
 
                 # To be nice on memory footprint, if there's a
                 # file descriptor, use that instead of reading

Tests/test_file_tiff.py

@@ -378,6 +378,22 @@ class TestFileTiff(PillowTestCase):
         self.assertEqual(im.tag_v2[X_RESOLUTION], 36)
         self.assertEqual(im.tag_v2[Y_RESOLUTION], 72)
 
+    def test_multipage_compression(self):
+        im = Image.open('Tests/images/compression.tif')
+
+        im.seek(0)
+        self.assertEqual(im._compression,'tiff_ccitt')
+        self.assertEqual(im.size, (10, 10))
+
+        im.seek(1)
+        self.assertEqual(im._compression,'packbits')
+        self.assertEqual(im.size, (10, 10))
+        im.load()
+
+        im.seek(0)
+        self.assertEqual(im._compression,'tiff_ccitt')
+        self.assertEqual(im.size, (10, 10))
+        im.load()
 
 if __name__ == '__main__':
     unittest.main()