Logo looks different after uploading

As you can see in the first picture, that is a logo I want to upload to my Matlab GUI. But after uploading it changes - it's rendered with a black color, or I would say it uses a black color as a backround (right down corner).

The code I'm using:

 axes(handles.axes13)
 imshow('logo4.png')

To fix it I have tried:

 axes(handles.axes13)
 set(gca,'color','none')
 imshow('logo4.png')

But doesn't work. Could you please help me out?

Answer 1

[Guillaume]

PNG images can have transparency information embedded in them and yours does. However, you discard it with your imshow call.

   axes(handles.axes13)
   [cdata, ~, transparency] = imread('logo4.png');  %get transparency
   himg = imshow(cdata);
   himg.AlphaData = alpha;  %apply transparency to the image.

However, note that the background colour will be that of the figure, not the axes since imshow makes the axes not visible.

[Franta Cymorek]

I have a different working solution, but still a big thanks for your help!