feat: sharpen image

src/safeds/data/image/containers/_image.py

@@ -6,6 +6,7 @@
 from typing import Any, BinaryIO
 
 import PIL
+from PIL import ImageEnhance
 from PIL.Image import Image as PillowImage
 from PIL.Image import open as open_image
 
@@ -246,3 +247,21 @@ def flip_horizontally(self) -> Image:
         imagecopy = copy.deepcopy(self)
         imagecopy._image = self._image.transpose(PIL.Image.FLIP_LEFT_RIGHT)
         return imagecopy
+
+    def sharpen(self, factor: float) -> Image:
+        """
+        Return the sharpened image.
+
+        Parameters
+        ----------
+        factor: The amount of sharpness to be applied to the image.
+        Factor 1.0 is considered to be neutral and does not make any changes.
+
+        Returns
+        -------
+        result : Image
+            The image sharpened by the given factor.
+        """
+        image_copy = copy.deepcopy(self)
+        image_copy._image = ImageEnhance.Sharpness(image_copy._image).enhance(factor)
+        return image_copy

tests/safeds/data/image/containers/test_image.py

@@ -247,3 +247,19 @@ def test_should_be_original(self) -> None:
         image = Image.from_png_file(resolve_resource_path("image/original.png"))
         image2 = image.flip_horizontally().flip_horizontally()
         assert image == image2
+
+
+class TestSharpen:
+    @pytest.mark.parametrize("factor", [2, 25])
+    def test_should_sharpen(self, factor: float) -> None:
+        image = Image.from_png_file(resolve_resource_path("image/sharpen/to_sharpen.png"))
+        image2 = image.sharpen(factor)
+        assert image != image2
+        assert image2 == Image.from_png_file(
+            resolve_resource_path("image/sharpen/sharpened_by_" + str(factor) + ".png"),
+        )
+
+    def test_should_not_sharpen(self) -> None:
+        image = Image.from_png_file(resolve_resource_path("image/sharpen/to_sharpen.png"))
+        image2 = image.sharpen(1)
+        assert image == image2