HxW or WxH?

<p>Which is correct when specifying the size of a 2D work? Height x Width, or Width x Height?</p>

<p>I'm guessing it's HxW, based on these sites: Mona</a> Lisa - Wikipedia, the free encyclopedia, <a href="http://en.wikipedia.org/wiki/The_Birth_of_Venus_(Botticelli)%5B/url%5D"&gt;http://en.wikipedia.org/wiki/The_Birth_of_Venus_(Botticelli)&lt;/a>. Also, the standard for 3 dimensions is HxWxD.</p>

<p>But wait ... on Windows Vista when you view the size dimensions of an image file (e.g. right-click --> properties --> details --> image --> dimensions), it seems to display the size as WxH. I'm guessing HxW is still correct though.</p>