diff --git a/CHANGES.rst b/CHANGES.rst
index be16960b4..2b1945012 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -8,6 +8,18 @@ Changelog (Pillow)
 - Python 2.7 support will be removed in Pillow 7.0.0 #3682
   [hugovk]
 
+- Add EXIF support for PNG #3674
+  [radarhere]
+
+- Add option to set dither param on quantize #3699
+  [glasnt]
+
+- Add reading of DDS uncompressed RGB data #3673
+  [radarhere]
+
+- Correct length of Tiff BYTE tags #3672
+  [radarhere]
+
 - Add DIB saving and loading through Image open #3691
   [radarhere]
 
diff --git a/Tests/images/exif.png b/Tests/images/exif.png
new file mode 100644
index 000000000..0388b6b8a
Binary files /dev/null and b/Tests/images/exif.png differ
diff --git a/Tests/images/uncompressed_rgb.dds b/Tests/images/uncompressed_rgb.dds
new file mode 100755
index 000000000..cd5189532
Binary files /dev/null and b/Tests/images/uncompressed_rgb.dds differ
diff --git a/Tests/images/uncompressed_rgb.png b/Tests/images/uncompressed_rgb.png
new file mode 100644
index 000000000..50bca09ee
Binary files /dev/null and b/Tests/images/uncompressed_rgb.png differ
diff --git a/Tests/images/unimplemented_dxgi_format.dds b/Tests/images/unimplemented_dxgi_format.dds
new file mode 100644
index 000000000..5ecb42006
Binary files /dev/null and b/Tests/images/unimplemented_dxgi_format.dds differ
diff --git a/Tests/images/unimplemented_pixel_format.dds b/Tests/images/unimplemented_pixel_format.dds
new file mode 100755
index 000000000..41a343886
Binary files /dev/null and b/Tests/images/unimplemented_pixel_format.dds differ
diff --git a/Tests/test_file_dds.py b/Tests/test_file_dds.py
index af2524c4a..605c5f69b 100644
--- a/Tests/test_file_dds.py
+++ b/Tests/test_file_dds.py
@@ -7,6 +7,7 @@ TEST_FILE_DXT1 = "Tests/images/dxt1-rgb-4bbp-noalpha_MipMaps-1.dds"
 TEST_FILE_DXT3 = "Tests/images/dxt3-argb-8bbp-explicitalpha_MipMaps-1.dds"
 TEST_FILE_DXT5 = "Tests/images/dxt5-argb-8bbp-interpolatedalpha_MipMaps-1.dds"
 TEST_FILE_DX10_BC7 = "Tests/images/bc7-argb-8bpp_MipMaps-1.dds"
+TEST_FILE_UNCOMPRESSED_RGB = "Tests/images/uncompressed_rgb.dds"
 
 
 class TestFileDds(PillowTestCase):
@@ -67,6 +68,24 @@ class TestFileDds(PillowTestCase):
 
         self.assert_image_equal(target, im)
 
+    def test_unimplemented_dxgi_format(self):
+        self.assertRaises(NotImplementedError, Image.open,
+                          "Tests/images/unimplemented_dxgi_format.dds")
+
+    def test_uncompressed_rgb(self):
+        """Check uncompressed RGB images can be opened"""
+
+        target = Image.open(TEST_FILE_UNCOMPRESSED_RGB.replace('.dds', '.png'))
+
+        im = Image.open(TEST_FILE_UNCOMPRESSED_RGB)
+        im.load()
+
+        self.assertEqual(im.format, "DDS")
+        self.assertEqual(im.mode, "RGBA")
+        self.assertEqual(im.size, (800, 600))
+
+        self.assert_image_equal(target, im)
+
     def test__validate_true(self):
         """Check valid prefix"""
         # Arrange
@@ -110,3 +129,7 @@ class TestFileDds(PillowTestCase):
             im.load()
 
         self.assertRaises(IOError, short_file)
+
+    def test_unimplemented_pixel_format(self):
+        self.assertRaises(NotImplementedError, Image.open,
+                          "Tests/images/unimplemented_pixel_format.dds")
diff --git a/Tests/test_file_libtiff.py b/Tests/test_file_libtiff.py
index 56564ebde..e395708c3 100644
--- a/Tests/test_file_libtiff.py
+++ b/Tests/test_file_libtiff.py
@@ -234,11 +234,11 @@ class TestFileLibTiff(LibTiffTestCase):
 
     def test_custom_metadata(self):
         custom = {
-            37000: 4,
-            37001: 4.2,
-            37002: 'custom tag value',
-            37003: u'custom tag value',
-            37004: b'custom tag value'
+            37000: [4, TiffTags.SHORT],
+            37001: [4.2, TiffTags.RATIONAL],
+            37002: ['custom tag value', TiffTags.ASCII],
+            37003: [u'custom tag value', TiffTags.ASCII],
+            37004: [b'custom tag value', TiffTags.BYTE]
         }
 
         libtiff_version = TiffImagePlugin._libtiff_version()
@@ -251,17 +251,33 @@ class TestFileLibTiff(LibTiffTestCase):
         for libtiff in libtiffs:
             TiffImagePlugin.WRITE_LIBTIFF = libtiff
 
-            im = hopper()
+            def check_tags(tiffinfo):
+                im = hopper()
 
-            out = self.tempfile("temp.tif")
-            im.save(out, tiffinfo=custom)
-            TiffImagePlugin.WRITE_LIBTIFF = False
+                out = self.tempfile("temp.tif")
+                im.save(out, tiffinfo=tiffinfo)
 
-            reloaded = Image.open(out)
-            for tag, value in custom.items():
-                if libtiff and isinstance(value, bytes):
-                    value = value.decode()
-                self.assertEqual(reloaded.tag_v2[tag], value)
+                reloaded = Image.open(out)
+                for tag, value in tiffinfo.items():
+                    reloaded_value = reloaded.tag_v2[tag]
+                    if isinstance(reloaded_value, TiffImagePlugin.IFDRational):
+                        reloaded_value = float(reloaded_value)
+
+                    if libtiff and isinstance(value, bytes):
+                        value = value.decode()
+
+                    self.assertEqual(reloaded_value, value)
+
+            # Test with types
+            ifd = TiffImagePlugin.ImageFileDirectory_v2()
+            for tag, tagdata in custom.items():
+                ifd[tag] = tagdata[0]
+                ifd.tagtype[tag] = tagdata[1]
+            check_tags(ifd)
+
+            # Test without types
+            check_tags({tag: tagdata[0] for tag, tagdata in custom.items()})
+        TiffImagePlugin.WRITE_LIBTIFF = False
 
     def test_int_dpi(self):
         # issue #1765
diff --git a/Tests/test_file_png.py b/Tests/test_file_png.py
index 2b80bf357..c2864d223 100644
--- a/Tests/test_file_png.py
+++ b/Tests/test_file_png.py
@@ -590,6 +590,40 @@ class TestFilePng(PillowTestCase):
         im = Image.open("Tests/images/hopper_idat_after_image_end.png")
         self.assertEqual(im.text, {'TXT': 'VALUE', 'ZIP': 'VALUE'})
 
+    def test_exif(self):
+        im = Image.open("Tests/images/exif.png")
+        exif = im._getexif()
+        self.assertEqual(exif[274], 1)
+
+    def test_exif_save(self):
+        im = Image.open("Tests/images/exif.png")
+
+        test_file = self.tempfile("temp.png")
+        im.save(test_file)
+
+        reloaded = Image.open(test_file)
+        exif = reloaded._getexif()
+        self.assertEqual(exif[274], 1)
+
+    def test_exif_from_jpg(self):
+        im = Image.open("Tests/images/pil_sample_rgb.jpg")
+
+        test_file = self.tempfile("temp.png")
+        im.save(test_file)
+
+        reloaded = Image.open(test_file)
+        exif = reloaded._getexif()
+        self.assertEqual(exif[305], "Adobe Photoshop CS Macintosh")
+
+    def test_exif_argument(self):
+        im = Image.open(TEST_PNG_FILE)
+
+        test_file = self.tempfile("temp.png")
+        im.save(test_file, exif=b"exifstring")
+
+        reloaded = Image.open(test_file)
+        self.assertEqual(reloaded.info["exif"], b"Exif\x00\x00exifstring")
+
     @unittest.skipUnless(HAVE_WEBP and _webp.HAVE_WEBPANIM,
                          "WebP support not installed with animation")
     def test_apng(self):
diff --git a/Tests/test_image_quantize.py b/Tests/test_image_quantize.py
index 2f0b65758..762b4bcab 100644
--- a/Tests/test_image_quantize.py
+++ b/Tests/test_image_quantize.py
@@ -46,3 +46,19 @@ class TestImageQuantize(PillowTestCase):
         converted = image.quantize()
         self.assert_image(converted, 'P', converted.size)
         self.assert_image_similar(converted.convert('RGB'), image, 1)
+
+    def test_quantize_no_dither(self):
+        image = hopper()
+        palette = Image.open('Tests/images/caption_6_33_22.png').convert('P')
+
+        converted = image.quantize(dither=0, palette=palette)
+        self.assert_image(converted, 'P', converted.size)
+
+    def test_quantize_dither_diff(self):
+        image = hopper()
+        palette = Image.open('Tests/images/caption_6_33_22.png').convert('P')
+
+        dither = image.quantize(dither=1, palette=palette)
+        nodither = image.quantize(dither=0, palette=palette)
+
+        self.assertNotEqual(dither.tobytes(), nodither.tobytes())
diff --git a/docs/handbook/image-file-formats.rst b/docs/handbook/image-file-formats.rst
index 0fff91bb5..663b740d5 100644
--- a/docs/handbook/image-file-formats.rst
+++ b/docs/handbook/image-file-formats.rst
@@ -462,6 +462,10 @@ PNG
 Pillow identifies, reads, and writes PNG files containing ``1``, ``L``, ``P``,
 ``RGB``, or ``RGBA`` data. Interlaced files are supported as of v1.1.7.
 
+As of Pillow 6.0, EXIF data can be read from PNG images. However, unlike other
+image formats, EXIF data is not guaranteed to have been read until
+:py:meth:`~PIL.Image.Image.load` has been called.
+
 The :py:meth:`~PIL.Image.Image.open` method sets the following
 :py:attr:`~PIL.Image.Image.info` properties, when appropriate:
 
@@ -527,6 +531,11 @@ The :py:meth:`~PIL.Image.Image.save` method supports the following options:
 **icc_profile**
     The ICC Profile to include in the saved file.
 
+**exif**
+    The exif data to include in the saved file.
+
+    .. versionadded:: 6.0.0
+
 **bits (experimental)**
     For ``P`` images, this option controls how many bits to store. If omitted,
     the PNG writer uses 8 bits (256 colors).
@@ -849,8 +858,8 @@ DDS
 
 DDS is a popular container texture format used in video games and natively
 supported by DirectX.
-Currently, DXT1, DXT3, and DXT5 pixel formats are supported and only in ``RGBA``
-mode.
+Currently, uncompressed RGB data and DXT1, DXT3, and DXT5 pixel formats are
+supported, and only in ``RGBA`` mode.
 
 .. versionadded:: 3.4.0 DXT3
 
diff --git a/docs/releasenotes/6.0.0.rst b/docs/releasenotes/6.0.0.rst
index f16c718a1..58586f3bb 100644
--- a/docs/releasenotes/6.0.0.rst
+++ b/docs/releasenotes/6.0.0.rst
@@ -107,10 +107,22 @@ DIB File Format
 
 Pillow now supports reading and writing the DIB "Device Independent Bitmap" file format.
 
+Image.quantize
+^^^^^^^^^^^^^^
+
+The `dither` option is now a customisable parameter (was previously hardcoded to `1`). This parameter takes the same values used in `Image.convert`
+
+PNG EXIF Data
+^^^^^^^^^^^^^
+
+EXIF data can now be read from and saved to PNG images. However, unlike other image
+formats, EXIF data is not guaranteed to have been read until
+:py:meth:`~PIL.Image.Image.load` has been called.
+
 Other Changes
 =============
 
-TODO
-^^^^
+Reading new DDS image format
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-TODO
+Pillow can now read uncompressed RGB data from DDS images.
diff --git a/src/PIL/DdsImagePlugin.py b/src/PIL/DdsImagePlugin.py
index edc1b7aa3..3954a1d6e 100644
--- a/src/PIL/DdsImagePlugin.py
+++ b/src/PIL/DdsImagePlugin.py
@@ -123,43 +123,52 @@ class DdsImageFile(ImageFile.ImageFile):
         # pixel format
         pfsize, pfflags = struct.unpack("<2I", header.read(8))
         fourcc = header.read(4)
-        bitcount, rmask, gmask, bmask, amask = struct.unpack("<5I",
-                                                             header.read(20))
+        bitcount, = struct.unpack("<I", header.read(4))
+        masks = struct.unpack("<4I", header.read(16))
+        if pfflags & 0x40:
+            # DDPF_RGB - Texture contains uncompressed RGB data
+            masks = {mask: ["R", "G", "B", "A"][i] for i, mask in enumerate(masks)}
+            rawmode = ""
+            if bitcount == 32:
+                rawmode += masks[0xff000000]
+            rawmode += masks[0xff0000] + masks[0xff00] + masks[0xff]
 
-        data_start = header_size + 4
-        n = 0
-        if fourcc == b"DXT1":
-            self.pixel_format = "DXT1"
-            n = 1
-        elif fourcc == b"DXT3":
-            self.pixel_format = "DXT3"
-            n = 2
-        elif fourcc == b"DXT5":
-            self.pixel_format = "DXT5"
-            n = 3
-        elif fourcc == b"DX10":
-            data_start += 20
-            # ignoring flags which pertain to volume textures and cubemaps
-            dxt10 = BytesIO(self.fp.read(20))
-            dxgi_format, dimension = struct.unpack("<II", dxt10.read(8))
-            if dxgi_format in (DXGI_FORMAT_BC7_TYPELESS,
-                               DXGI_FORMAT_BC7_UNORM):
-                self.pixel_format = "BC7"
-                n = 7
-            elif dxgi_format == DXGI_FORMAT_BC7_UNORM_SRGB:
-                self.pixel_format = "BC7"
-                self.im_info["gamma"] = 1/2.2
-                n = 7
-            else:
-                raise NotImplementedError("Unimplemented DXGI format %d" %
-                                          (dxgi_format))
+            self.tile = [("raw", (0, 0) + self.size, 0, (rawmode, 0, 1))]
         else:
-            raise NotImplementedError("Unimplemented pixel format %r" %
-                                      (fourcc))
+            data_start = header_size + 4
+            n = 0
+            if fourcc == b"DXT1":
+                self.pixel_format = "DXT1"
+                n = 1
+            elif fourcc == b"DXT3":
+                self.pixel_format = "DXT3"
+                n = 2
+            elif fourcc == b"DXT5":
+                self.pixel_format = "DXT5"
+                n = 3
+            elif fourcc == b"DX10":
+                data_start += 20
+                # ignoring flags which pertain to volume textures and cubemaps
+                dxt10 = BytesIO(self.fp.read(20))
+                dxgi_format, dimension = struct.unpack("<II", dxt10.read(8))
+                if dxgi_format in (DXGI_FORMAT_BC7_TYPELESS,
+                                   DXGI_FORMAT_BC7_UNORM):
+                    self.pixel_format = "BC7"
+                    n = 7
+                elif dxgi_format == DXGI_FORMAT_BC7_UNORM_SRGB:
+                    self.pixel_format = "BC7"
+                    self.im_info["gamma"] = 1/2.2
+                    n = 7
+                else:
+                    raise NotImplementedError("Unimplemented DXGI format %d" %
+                                              (dxgi_format))
+            else:
+                raise NotImplementedError("Unimplemented pixel format %r" %
+                                          (fourcc))
 
-        self.tile = [
-            ("bcn", (0, 0) + self.size, data_start, (n))
-        ]
+            self.tile = [
+                ("bcn", (0, 0) + self.size, data_start, (n))
+            ]
 
     def load_seek(self, pos):
         pass
diff --git a/src/PIL/Image.py b/src/PIL/Image.py
index 0f0d49e82..24e0d7fab 100644
--- a/src/PIL/Image.py
+++ b/src/PIL/Image.py
@@ -1049,7 +1049,7 @@ class Image(object):
                 new_im.info['transparency'] = trns
         return new_im
 
-    def quantize(self, colors=256, method=None, kmeans=0, palette=None):
+    def quantize(self, colors=256, method=None, kmeans=0, palette=None, dither=1):
         """
         Convert the image to 'P' mode with the specified number
         of colors.
@@ -1062,6 +1062,10 @@ class Image(object):
         :param kmeans: Integer
         :param palette: Quantize to the palette of given
                         :py:class:`PIL.Image.Image`.
+        :param dither: Dithering method, used when converting from
+           mode "RGB" to "P" or from "RGB" or "L" to "1".
+           Available methods are NONE or FLOYDSTEINBERG (default).
+           Default: 1 (legacy setting)
         :returns: A new image
 
         """
@@ -1089,7 +1093,7 @@ class Image(object):
                 raise ValueError(
                     "only RGB or L mode images can be quantized to a palette"
                     )
-            im = self.im.convert("P", 1, palette.im)
+            im = self.im.convert("P", dither, palette.im)
             return self._new(im)
 
         return self._new(self.im.quantize(colors, method, kmeans))
@@ -2002,7 +2006,7 @@ class Image(object):
         library automatically seeks to frame 0.
 
         Note that in the current version of the library, most sequence
-        formats only allows you to seek to the next frame.
+        formats only allow you to seek to the next frame.
 
         See :py:meth:`~PIL.Image.Image.tell`.
 
diff --git a/src/PIL/PngImagePlugin.py b/src/PIL/PngImagePlugin.py
index e04ae2274..df632af1d 100644
--- a/src/PIL/PngImagePlugin.py
+++ b/src/PIL/PngImagePlugin.py
@@ -529,6 +529,11 @@ class PngStream(ChunkStream):
 
         return s
 
+    def chunk_eXIf(self, pos, length):
+        s = ImageFile._safe_read(self.fp, length)
+        self.im_info["exif"] = b"Exif\x00\x00"+s
+        return s
+
     # APNG chunks
     def chunk_acTL(self, pos, length):
         s = ImageFile._safe_read(self.fp, length)
@@ -683,6 +688,12 @@ class PngImageFile(ImageFile.ImageFile):
         self.png.close()
         self.png = None
 
+    def _getexif(self):
+        if "exif" not in self.info:
+            self.load()
+        from .JpegImagePlugin import _getexif
+        return _getexif(self)
+
 
 # --------------------------------------------------------------------
 # PNG writer
@@ -861,6 +872,12 @@ def _save(im, fp, filename, chunk=putchunk):
                 chunks.remove(cid)
                 chunk(fp, cid, data)
 
+    exif = im.encoderinfo.get("exif", im.info.get("exif"))
+    if exif:
+        if exif.startswith(b"Exif\x00\x00"):
+            exif = exif[6:]
+        chunk(fp, b"eXIf", exif)
+
     ImageFile._save(im, _idat(fp, chunk),
                     [("zip", (0, 0)+im.size, 0, rawmode)])
 
diff --git a/src/PIL/TiffImagePlugin.py b/src/PIL/TiffImagePlugin.py
index aac630ea1..2e05c9a0b 100644
--- a/src/PIL/TiffImagePlugin.py
+++ b/src/PIL/TiffImagePlugin.py
@@ -819,7 +819,7 @@ class ImageFileDirectory_v2(MutableMapping):
                     print("- value:", values)
 
             # count is sum of lengths for string and arbitrary data
-            if typ in [TiffTags.ASCII, TiffTags.UNDEFINED]:
+            if typ in [TiffTags.BYTE, TiffTags.ASCII, TiffTags.UNDEFINED]:
                 count = len(data)
             else:
                 count = len(values)