Merge pull request #5434 from radarhere/text_alpha

Author: hugovk

Tests/images/transparent_background_text.png

@@ -236,7 +236,7 @@ def test_color_mask_L(self):
                 [
                     (127, 191, 254, 191),
                     (111, 207, 206, 110),
-                    (255, 255, 255, 0) if mode == "RGBA" else (127, 254, 127, 0),
+                    (127, 254, 127, 0),
                     (207, 207, 239, 239),
                     (191, 191, 190, 191),
                     (207, 206, 111, 112),

Tests/images/transparent_background_text_L.png

@@ -131,6 +131,9 @@ def test_transparent_background(self):
         target = "Tests/images/transparent_background_text.png"
         assert_image_similar_tofile(im, target, 4.09)
 
+        target = "Tests/images/transparent_background_text_L.png"
+        assert_image_similar_tofile(im.convert("L"), target, 0.01)
+
     def test_textsize_equal(self):
         im = Image.new(mode="RGB", size=(300, 100))
         draw = ImageDraw.Draw(im)

Tests/test_image_paste.py

@@ -436,7 +436,7 @@ fill_mask_L(
                          strcmp(imOut->mode, "La") == 0 ||
                          strcmp(imOut->mode, "LA") == 0 ||
                          strcmp(imOut->mode, "PA") == 0) &&
-                        i != 3) {
+                        i != 3 && channel_mask != 0) {
                         channel_mask =
                             255 - (255 - channel_mask) * (1 - (255 - out[3]) / 255);
                     }