update

vllm/multimodal/image.py

@@ -0,0 +1,36 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+
+from PIL import Image
+
+
+def rescale_image_size(
+    image: Image.Image, size_factor: float, transpose: int = -1
+) -> Image.Image:
+    """Rescale the dimensions of an image by a constant factor."""
+    new_width = int(image.width * size_factor)
+    new_height = int(image.height * size_factor)
+    image = image.resize((new_width, new_height))
+    if transpose >= 0:
+        image = image.transpose(Image.Transpose(transpose))
+    return image
+
+
+def rgba_to_rgb(
+    image: Image.Image,
+    background_color: tuple[int, int, int] | list[int] = (255, 255, 255),
+) -> Image.Image:
+    """Convert an RGBA image to RGB with filled background color."""
+    assert image.mode == "RGBA"
+    converted = Image.new("RGB", image.size, background_color)
+    converted.paste(image, mask=image.split()[3])  # 3 is the alpha channel
+    return converted
+
+
+def convert_image_mode(image: Image.Image, to_mode: str):
+    if image.mode == to_mode:
+        return image
+    elif image.mode == "RGBA" and to_mode == "RGB":
+        return rgba_to_rgb(image)
+    else:
+        return image.convert(to_mode)