Use full-bleed photos with a single-line bottom watermark

tests/test_photo_canvas.py

@@ -25,7 +25,7 @@ def test_canvas_respects_rotation_and_explicit_direction(rotation, mode):
 
 
 @pytest.mark.parametrize("profile", ["color", "grayscale"])
-def test_landscape_caption_keeps_three_rows(service, profile):
+def test_landscape_caption_uses_compact_watermark(service, profile):
     out = BytesIO()
     Image.new("RGB", (1600, 900), "blue").save(out, "JPEG")
     data = render_captioned_photo(
@@ -37,8 +37,9 @@ def test_landscape_caption_keeps_three_rows(service, profile):
     )
     with Image.open(BytesIO(data)) as image:
         assert image.size == (1600, 1200)
-        for y in [984, 1048, 1100]:
-            assert image.crop((60, y, 1540, y + 50)).convert("L").getextrema()[0] < 50
+        assert image.crop((30, 1128, 1570, 1200)).convert("L").getextrema()[0] < 50
+        assert image.getpixel((20, 1100))[0] < 230
+        assert image.getpixel((20, 1190))[0] > 240
         pixel = image.getpixel((800, 480))
         assert (
             len(set(pixel)) <= 2