modified error in reporting unexpeced backgroundimage

server.py

@@ -61,7 +61,7 @@ class SegmenterBackground():
         elif(background_image=="remove"):
             outpt=np.zeros_like(raw_image)
             print("remove effect")
-        elif (type(background_image)==PIL.Image.Image ): # not PIL.JpegImagePlugin.JpegImageFile as resized
+        elif isinstance(background_image, PIL.Image.Image):#(type(background_image)==PIL.Image.Image ): # not PIL.JpegImagePlugin.JpegImageFile as resized
             #make it last case to not always give replace when uploading same image e.g. as in app , this is easiest way to modify server 
             #,may be clened in other version
             outpt = np.array(background_image.copy())