Merge pull request #6559 from radarhere/photoimage

Author: hugovk

Tests/test_imagetk.py

@@ -69,6 +69,13 @@ def test_photoimage():
         assert_image_equal(reloaded, im.convert("RGBA"))
 
 
+def test_photoimage_apply_transparency():
+    with Image.open("Tests/images/pil123p.png") as im:
+        im_tk = ImageTk.PhotoImage(im)
+        reloaded = ImageTk.getimage(im_tk)
+        assert_image_equal(reloaded, im.convert("RGBA"))
+
+
 def test_photoimage_blank():
     # test a image using mode/size:
     for mode in TK_MODES:

src/PIL/ImageTk.py

@@ -107,6 +107,7 @@ def __init__(self, image=None, size=None, **kw):
             mode = image.mode
             if mode == "P":
                 # palette mapped data
+                image.apply_transparency()
                 image.load()
                 try:
                     mode = image.palette.mode