Merge pull request #6061 from radarhere/getpalette

Tests/test_image_getpalette.py

@@ -1,3 +1,5 @@
+from PIL import Image
+
 from .helper import hopper
 
 
@@ -17,3 +19,26 @@ def palette(mode):
     assert palette("RGBA") is None
     assert palette("CMYK") is None
     assert palette("YCbCr") is None
+
+
+def test_palette_rawmode():
+    im = Image.new("P", (1, 1))
+    im.putpalette((1, 2, 3))
+
+    for rawmode in ("RGB", None):
+        rgb = im.getpalette(rawmode)
+        assert rgb == [1, 2, 3]
+
+    # Convert the RGB palette to RGBA
+    rgba = im.getpalette("RGBA")
+    assert rgba == [1, 2, 3, 255]
+
+    im.putpalette((1, 2, 3, 4), "RGBA")
+
+    # Convert the RGBA palette to RGB
+    rgb = im.getpalette("RGB")
+    assert rgb == [1, 2, 3]
+
+    for rawmode in ("RGBA", None):
+        rgba = im.getpalette(rawmode)
+        assert rgba == [1, 2, 3, 4]

docs/releasenotes/9.1.0.rst

@@ -111,6 +111,13 @@ At present, the information within each block is merely returned as a dictionary
 "data" entry. This will allow more useful information to be added in the future without
 breaking backwards compatibility.
 
+Added rawmode argument to Image.getpalette()
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+By default, :py:meth:`~PIL.Image.Image.getpalette` returns RGB data from the palette.
+A ``rawmode`` argument has been added, to allow the mode to be chosen instead. ``None``
+can be used to return data in the current mode of the palette.
+
 Other Changes
 =============
 

src/PIL/Image.py

@@ -1441,19 +1441,27 @@ def getim(self):
         self.load()
         return self.im.ptr
 
-    def getpalette(self):
+    def getpalette(self, rawmode="RGB"):
         """
         Returns the image palette as a list.
 
+        :param rawmode: The mode in which to return the palette. ``None`` will
+           return the palette in its current mode.
+
+           .. versionadded:: 9.1.0
+
         :returns: A list of color values [r, g, b, ...], or None if the
            image has no palette.
         """
 
         self.load()
         try:
-            return list(self.im.getpalette())
+            mode = self.im.getpalettemode()
         except ValueError:
             return None  # no palette
+        if rawmode is None:
+            rawmode = mode
+        return list(self.im.getpalette(mode, rawmode))
 
     def getpixel(self, xy):
         """

src/libImaging/Pack.c

@@ -574,6 +574,7 @@ static struct {
     /* true colour */
     {"RGB", "RGB", 24, ImagingPackRGB},
     {"RGB", "RGBX", 32, copy4},
+    {"RGB", "RGBA", 32, copy4},
     {"RGB", "XRGB", 32, ImagingPackXRGB},
     {"RGB", "BGR", 24, ImagingPackBGR},
     {"RGB", "BGRX", 32, ImagingPackBGRX},