Why is imshow() not showing my image correctly?

Good day everyone. This is the image i have.

The name of the image is white_circles. It is a .png format image.

This is my code.

    im = imread('white_circles.png');
    imshow(im);

This is the output.

What is happening here? When i try the same with .jpg everything works fine. Is this issue related to the format of the image or is it due to something else?

Please help me out. Thank you.

[KSSV]

Try converting png into tiff/ bitmap and use the same lines of code.

[lohit madiwal]

I converted the image to bitmap. This is the image.

I recieved the output as following:

The output is as expected.

Answer 1

[KSSV]

You have to use the following

[im,map] = imread('white_circles.png');

imshow(im,map);

[lohit madiwal]

Could you please explain as to why the above process should be done sir? It works.