Update app.py

app.py

@@ -1,7 +1,7 @@
 import matplotlib
 matplotlib.use('agg')
 import os
-os.system('Xvfb :1 -screen 0 1800x1600x24  &')    # create virtual display with size 1600x1200 and 16 bit color. Color can be changed to 24 or 8
+os.system('Xvfb :1 -screen 0 1600x1200x16  &')    # create virtual display with size 1600x1200 and 16 bit color. Color can be changed to 24 or 8
 os.environ['DISPLAY']=':1.0'    # tell X clients to use our virtual DISPLAY :1.0
 
 from PIL import Image
@@ -60,8 +60,8 @@ if __name__ == "__main__":
         print(gold_standard_img.info)
         print(best_parse_img.info)
         
-        gold_standard_img.save('gold_standard.png', dpi=(300,300))
-        best_parse_img.save('best_parse.png', dpi=(300,300))
+        gold_standard_img.save('gold_standard.png', dpi=(600,600))
+        best_parse_img.save('best_parse.png', dpi=(600,600))
         
         gold_standard_img_png = Image.open("gold_standard.png")
         best_parse_img_png = Image.open("best_parse.png")