> So, my question is how could I achieve the desired result for this and
> such images?
> How would do you work out similar or even more advanced cases?

Hi Sophoklis,

There are a few good methods to use.

For cutting out a logo, sometimes using Colors>Color to Alpha with the 
background color selected does the job well.

For this I would recommend using the Eraser tool, and tracing the 
outline of the server. Square objects are pretty simple to do - use the 
shift button to drag your Eraser tool from point A to point B.

-Stefan Maerz
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