Reduced epsilons

Tests/test_file_avif.py

@@ -147,7 +147,7 @@ def test_read(self) -> None:
             # generated with:
             # avifdec hopper.avif hopper_avif_write.png
             assert_image_similar_tofile(
-                image, "Tests/images/avif/hopper_avif_write.png", 12.0
+                image, "Tests/images/avif/hopper_avif_write.png", 11.5
             )
 
     def _roundtrip(self, tmp_path: Path, mode: str, epsilon: float) -> None:
@@ -163,7 +163,7 @@ def _roundtrip(self, tmp_path: Path, mode: str, epsilon: float) -> None:
             if mode == "RGB":
                 # avifdec hopper.avif avif/hopper_avif_write.png
                 assert_image_similar_tofile(
-                    image, "Tests/images/avif/hopper_avif_write.png", 12.0
+                    image, "Tests/images/avif/hopper_avif_write.png", 5.81
                 )
 
             # This test asserts that the images are similar. If the average pixel
@@ -181,7 +181,7 @@ def test_write_rgb(self, tmp_path: Path) -> None:
         Does it have the bits we expect?
         """
 
-        self._roundtrip(tmp_path, "RGB", 12.5)
+        self._roundtrip(tmp_path, "RGB", 8.41)
 
     def test_AvifEncoder_with_invalid_args(self) -> None:
         """
@@ -574,7 +574,7 @@ def test_p_mode_transparency(self) -> None:
         im_png.save(buf_out, format="AVIF", quality=100)
 
         with Image.open(buf_out) as expected:
-            assert_image_similar(im_png.convert("RGBA"), expected, 1)
+            assert_image_similar(im_png.convert("RGBA"), expected, 0.17)
 
     def test_decoder_strict_flags(self) -> None:
         # This would fail if full avif strictFlags were enabled
@@ -633,10 +633,10 @@ def test_write_animation_L(self, tmp_path: Path) -> None:
                 assert im.n_frames == orig.n_frames
 
                 # Compare first and second-to-last frames to the original animated GIF
-                assert_image_similar(im.convert("RGB"), orig.convert("RGB"), 25.0)
+                assert_image_similar(im.convert("RGB"), orig.convert("RGB"), 2.25)
                 orig.seek(orig.n_frames - 2)
                 im.seek(im.n_frames - 2)
-                assert_image_similar(im.convert("RGB"), orig.convert("RGB"), 25.0)
+                assert_image_similar(im.convert("RGB"), orig.convert("RGB"), 2.54)
 
     def test_write_animation_RGB(self, tmp_path: Path) -> None:
         """
@@ -649,11 +649,11 @@ def check(temp_file: str) -> None:
                 assert im.n_frames == 4
 
                 # Compare first frame to original
-                assert_image_similar(im, frame1.convert("RGBA"), 25.0)
+                assert_image_similar(im, frame1.convert("RGBA"), 2.7)
 
                 # Compare second frame to original
                 im.seek(1)
-                assert_image_similar(im, frame2.convert("RGBA"), 25.0)
+                assert_image_similar(im, frame2.convert("RGBA"), 4.1)
 
         with self.star_frames() as frames:
             frame1 = frames[0]