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Dockerfile

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+FROM python:3.8-slim-buster
+
+WORKDIR /app
+
+COPY requirements.txt .
+
+RUN pip3 install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+CMD ["python3", "app.py"]

app.py

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+import gradio as gr
+import cv2
+
+def black_and_white(image):
+    gray_image = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
+    return gray_image
+
+iface = gr.Interface(fn=black_and_white, inputs="image", outputs="image")
+iface.launch()

requirements.txt

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+gradio
+opencv-python-headless

test.py

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+import cv2
+from app import black_and_white
+
+def test_black_and_white():
+    image = cv2.imread("test_image.jpg")
+    result = black_and_white(image)
+    assert result.shape == (image.shape[0], image.shape[1])