Open the image with Preview.
Click the pencil icon to show tools.
Click the magical stick icon (instant alpha). If the icon is invisibility, widen window.
Drag area that you want remove, and make selected.
Press the Delete key and remove the area.
You can invert the selected area by command + shift + I.
Select the blank space with magical stick.
Press command + shift + I and invert the area.
You can remove the area that not selected by command + K.
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