Determine the size of an image
You may provide either a
String specifying the path to the image or a
Buffer containing the image data and you will receive an object with
'width' properties on your callback
var sz =fs =var buf = fs
sz is Copyright (c) 2013 Rod Vagg @rvagg and licensed under the MIT licence. All rights not explicitly granted in the MIT license are reserved. See the included LICENSE file for more details.