Blank picture: 1 px high x 300 px wide, transparent. Good for a placeholder when you don't want to take up any vertical space. See <a href="//commons.wikimedia.org/wiki/File:Blank.png" title="File:Blank.png">File:Blank.png</a> for a placeholder with a 3:2 aspect ratio, and <a href="//commons.wikimedia.org/wiki/File:Blank300vert.png" title="File:Blank300vert.png">File:Blank300vert.png</a> for a 300 x 1 px placeholder.
No machine-readable author provided. <a href="//commons.wikimedia.org/wiki/User:Tintazul" title="User:Tintazul">Tintazul</a> assumed (based on copyright claims).
No machine-readable source provided. Own work assumed (based on copyright claims).