Input Image has to be greyscale, otherwise broadcast error. Thus add .convert('L')

app.py

@@ -19,7 +19,8 @@ def process_image(image):
 st.title('Streamlit Replication of nielsr/TrOCR-handwritten')
 uploaded_file = st.file_uploader("Choose an image...")
 if uploaded_file:
-  input_image = Image.open(uploaded_file)
+  # .convert('L') to greyscale
+  input_image = Image.open(uploaded_file).convert('L')
   st.image(uploaded_file, caption='Input Image', use_column_width=True)
   generated_text = process_image(input_image)
   st.write(generated_text)