add app

app.py

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+import gradio as gr
+import numpy as np
+
+def create_mask(img):
+    alpha_channel = img["layers"][0][:, :, 3]
+    mask = np.where(alpha_channel == 0, 0, 255)
+    return mask
+
+with gr.Blocks(title="In-Paint Mask Creator") as demo:
+  with gr.Row(equal_height=True):
+    img = gr.ImageMask(sources=["upload", "clipboard"], 
+                       layers=False,
+                       transforms=[], 
+                       interactive=True,
+                       format="png", 
+                       label="base image", 
+                       show_label=True)
+    mask_image = gr.Image(label="mask image", show_label=True)
+  btn = gr.Button("Create Mask")
+  btn.click(create_mask, img, mask_image)
+
+demo.launch(debug=True)

requirements.txt

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+gradio
+numpy