Update pages/8_Rainfall.py

pages/8_Rainfall.py

@@ -8,7 +8,7 @@ import folium
 import base64
 import pandas as pd
 import numpy as np
-from PIL import Image, ImageFilter
+from PIL import Image, ImageFilter, ImageEnhance
 
 st.set_page_config(layout="wide", page_title="Rainfall Data Dashboard")
 
@@ -64,9 +64,16 @@ def filter_image_by_color(image, colors_to_extract_rgb):
 def smooth_image(image):
     return image.filter(ImageFilter.GaussianBlur(radius=3))
 
+def enhance_contrast(image, factor=1.5):
+    enhancer = ImageEnhance.Contrast(image)
+    enhanced_image = enhancer.enhance(factor)
+    return enhanced_image
+
 def create_map_with_radar_tile(image):
     filtered_image = filter_image_by_color(image, COLORS_TO_EXTRACT_RGB)
     smoothed_image = smooth_image(filtered_image)
+    enhanced_image = enhance_contrast(smoothed_image, factor=1.5)
+
     m = folium.Map(location=[22.364, 114.148], zoom_start=10, min_zoom=10, max_zoom=19,
                    tiles='https://mapapi.geodata.gov.hk/gs/api/v1.0.0/xyz/imagery/wgs84/{z}/{x}/{y}.png',
                    attr="Map information from Lands Department", control_scale=True, name="Basemap")
@@ -76,12 +83,12 @@ def create_map_with_radar_tile(image):
         overlay=True,
         name="Labels"
     ).add_to(m)
-    img_url = f"data:image/png;base64,{image_to_base64(smoothed_image)}"
+    img_url = f"data:image/png;base64,{image_to_base64(enhanced_image)}"
     folium.raster_layers.ImageOverlay(
         image=img_url,
         name="HKO Radar Image",
         bounds=[[22.893, 113.538], [21.716, 115.362]],
-        opacity=0.9,
+        opacity=0.95,
         interactive=False,
         cross_origin=False,
         zindex=1,