Help with Image check PHP

[tripc1]

I want to check if the image isn't empty.

 

For example:

That one isn't fully uploaded, so we don't need it

(if you can see there is blank space in the bottom of the picture):

or like that one:

 

But that one is fully uploaded, so we need it:

 

There is anyway to check if the image is fully uploaded or not?

I hope you understand what I mean.

 

Sorry if my English isn't good.

 

Thanks in advance.