imagesize library not supported 'bmp' image

[kkt8282]

First of all, thank you for providing a great source code!!

I'm using an image with 'bmp' extension.

The latest version uses the imagesize library.

But libraries do not support extensions.

Why are you using 'imagesize' instead of 'imread -> img.shape'??

[Taeyoung96]

Hi, @kkt8282

I merged PR #12 because of the image loading speed.

If you want to use imread function, you just fixed some codes referring to this.

Maybe, when you use bmp extenstion, you add some codes like this.

Thanks,