Pillow interoperability

Use to_pillow() to pass an image to Pillow in projects that use both libraries:

from blanket import Image as BlanketImage
from PIL import Image as PillowImage

blanket_image = BlanketImage.open("input.png")
pillow_image = blanket_image.to_pillow()
channels = pillow_image.split()
merged = PillowImage.merge("RGB", channels[:3])

blanket_result = BlanketImage.frombytes(merged.mode, merged.size, merged.tobytes())
blanket_result.save("result.jxl", lossless=True)

The adapter is explicit because Pillow operations require Pillow's private C image core. Pillow is not a Blanket runtime dependency.