Update app.py

app.py

@@ -17,6 +17,7 @@ The tool consists of the following components:
 To run the tool:
 1. Save the script as `cell_exp_past.py`.
 2. Run the script in a Python environment.
+
 ```python
 streamlit run cell_exp_past.py
 ```
@@ -39,6 +40,23 @@ import zipfile
 import json
 
 def zoom_at(img, x, y, zoom):
+    '''
+    increase the zoom level of the image at a specific point (x, y).
+
+    Parameters:
+    img (PIL.Image): The input image.
+    x (int): The x-coordinate of the point.
+    y (int): The y-coordinate of the point.
+    zoom (float): The zoom level.
+
+    Returns:
+    PIL.Image: The zoomed image.
+
+    Examples:
+    >>> img = Image.open('image.jpg')
+    >>> zoomed_img = zoom_at(img, 100, 100, 2.0)
+
+    '''
     w, h = img.size
     zoom2 = zoom * 2
     img = img.crop((x - w / zoom2, y - h / zoom2,
@@ -47,6 +65,13 @@ def zoom_at(img, x, y, zoom):
 
 st.title("CLL Image Processing Tool")
 
+st.write('''This tool allows you to upload microscope images,
+         adjust the view with zoom and enhancement controls,
+         and save the processed image along with annotations.
+         You can also export the processed image, description,
+         and parameters as a zip file.
+         ''')
+
 uploaded_files = st.file_uploader("Upload Images", accept_multiple_files=True, type="jpg")
 
 if uploaded_files: