How to get image size (bytes) using PIL

Question

I found out how to use PIL to get the image dimensions, but not the file size in bytes. I need to know the file size to decide if the file is too big to be uploaded to the d

Answer 1

I think this is the true measure and the fastest one of the size of the image in bytes in memory:

print("img size in memory in bytes: ", sys.getsizeof(img.tobytes()))

Then, the size of the file on disk depends on the format of the file:

    from io import BytesIO
    img_file = BytesIO()
    img.save(img_file, 'png')
    img_file_size_png = img_file.tell()
    img_file = BytesIO()
    img.save(img_file, 'jpeg')
    img_file_size_jpeg = img_file.tell()
    print("img_file_size png: ", img_file_size_png)
    print("img_file_size jpeg: ", img_file_size_jpeg)

Possible output for 32 x 32 x 3 images from CIFAR10 dataset:

img size in memory in bytes:  3105    
img_file_size png:  2488
img_file_size jpeg:  983