Merge pull request #6384 from radarhere/bmp_rle8

Fixed loading L mode BMP RLE8 images

Author: hugovk

Tests/images/hopper_rle8_greyscale.bmp

@@ -134,6 +134,9 @@ def test_rle8():
     with Image.open("Tests/images/hopper_rle8.bmp") as im:
         assert_image_similar_tofile(im.convert("RGB"), "Tests/images/hopper.bmp", 12)
 
+    with Image.open("Tests/images/hopper_rle8_greyscale.bmp") as im:
+        assert_image_equal_tofile(im, "Tests/images/bw_gradient.png")
+
     # This test image has been manually hexedited
     # to have rows with too much data
     with Image.open("Tests/images/hopper_rle8_row_overflow.bmp") as im:

Tests/test_file_bmp.py

@@ -321,7 +321,8 @@ def decode(self, buffer):
                     # align to 16-bit word boundary
                     if self.fd.tell() % 2 != 0:
                         self.fd.seek(1, os.SEEK_CUR)
-        self.set_as_raw(bytes(data), ("P", 0, self.args[-1]))
+        rawmode = "L" if self.mode == "L" else "P"
+        self.set_as_raw(bytes(data), (rawmode, 0, self.args[-1]))
         return -1, 0