I want to save some figure I draw into png format with transparent background. I set the background to transparent by using 'color' property and I do see the figure shown has a transparent background. The only problem is that when i save the image, the image background is not transparent any more (I put the image in a powerpoint to test the transparency). The code is as follow:
Can anyone tell me what's wrong here and what I can do to correct this? Thanks!