How do I obtain true zero pixels after I have applied the following transform since the values of 0 pixels change? Is there a way of obtaining the zero values along each color channel separately?
 tfms = transforms.Compose([
    transforms.Resize(224),
    transforms.CenterCrop(224),
    transforms.ToTensor(),
    transforms.Normalize(mean=[0.485, 0.456, 0.406], std=[0.229, 0.224, 0.225])
    ])

Here is my use case. 
Screenshot 2020-02-28 at 3.21.34 PM800×596 189 KB