fix: pass (width, height) to Pillow in the Resize transform

fastembed/image/transform/functional.py

@@ -98,7 +98,12 @@ def resize(
     resample: int | Image.Resampling = Image.Resampling.BILINEAR,
 ) -> Image.Image:
     if isinstance(size, tuple):
-        return image.resize(size, resample)
+        # fastembed keeps sizes as (height, width) — `Transform.from_config` builds
+        # the tuple as (size["height"], size["width"]) — while Pillow's resize takes
+        # (width, height). The two agree for square sizes, so this only shows up on
+        # a non-square image processor configuration.
+        height, width = size
+        return image.resize((width, height), resample)
 
     height, width = image.height, image.width
     short, long = (width, height) if width <= height else (height, width)

tests/test_image_transform.py

@@ -0,0 +1,45 @@
+from PIL import Image
+
+from fastembed.image.transform.functional import resize
+from fastembed.image.transform.operators import Resize
+
+
+def test_resize_tuple_converts_from_height_width_to_pillow_order():
+    """A ``(height, width)`` size must reach Pillow as ``(width, height)``.
+
+    ``Transform.from_config`` builds the tuple as ``(size["height"], size["width"])``,
+    so every tuple reaching ``resize`` is in fastembed's height-first order, while
+    ``PIL.Image.resize`` takes width first. The two agree for square sizes, which is
+    why this went unnoticed.
+    """
+    image = Image.new("RGB", (300, 300))
+
+    resized = resize(image, size=(100, 200))
+
+    assert resized.size == (200, 100)  # PIL reports (width, height)
+
+
+def test_resize_operator_produces_requested_height_and_width():
+    image = Image.new("RGB", (300, 300))
+
+    resized = Resize(size=(100, 200))([image])[0]
+
+    width, height = resized.size
+    assert (height, width) == (100, 200)
+
+
+def test_resize_square_tuple_is_unchanged():
+    """The square case behaved correctly before and must keep doing so."""
+    image = Image.new("RGB", (300, 200))
+
+    assert resize(image, size=(224, 224)).size == (224, 224)
+
+
+def test_resize_int_keeps_shortest_edge_behaviour():
+    """The int branch already emitted Pillow order; it must not be disturbed."""
+    landscape = Image.new("RGB", (400, 200))
+    portrait = Image.new("RGB", (200, 400))
+
+    # size sets the shortest edge, and the aspect ratio is preserved.
+    assert resize(landscape, size=100).size == (200, 100)
+    assert resize(portrait, size=100).size == (100, 200)