Custom Markers only work with URLs

It seems that custom markers only work with URLs and not local image files.

This works:

icon = folium.features.CustomIcon('http://www.pngall.com/wp-content/uploads/2016/05/Iron-Man.png', icon_size=(50,50))
folium.Marker([43, -79],
              popup='Iron Man',
              icon=icon
              ).add_to(geo_map)

This does not work:

icon = folium.features.CustomIcon('Iron-Man.png', icon_size=(50,50))
folium.Marker([43, -79],
              popup='Iron Man',
              icon=icon
              ).add_to(geo_map)

[davidolmo]

Ok I see. It seems like the utility function that parses images for CustomIcon (image_to_url) no longer supports BytesIO format in the current version. However, it supports the path! (so it will transform the file automatically to Bytes for you). What I did is directly pass the path of the image:

icon_path = r"C:\some_path\icon.png" icon = folium.features.CustomIcon(icon_image=icon_path ,icon_size=icons_size)

marker=folium.Marker([row["coord"].y,row["coord"].x],popup=popup,icon=icon).add_to(feature_groups[alert_icon_name])

[dvu4]

@nanodan this code will work with local image file.

import base64

encoded = base64.b64encode(open('Iron-Man.png', 'rb').read())
decoded = base64.b64decode(encoded)
icon_url = BytesIO(decoded)
icon = folium.features.CustomIcon(icon_url, icon_size=(50,50))
folium.Marker([43, -79],
              popup='Iron Man',
              icon=icon
              ).add_to(geo_map)

but for list of markers, the code only shows the first icon. 😦