Ummm, no. The document in the scan doesn't go all the way to the edge of the jpg, which is what would happen if it was cropped. Cropping doesn't add white space around a document. What you see in Obama's scan is the full document PLUS white space surrounding the edge of the document. The white part is the bottom of the scan lid. Somehow, the paper grew between the scan and the document that was photographed by factlack dot org. One or both documents is fraudulent.
Uhh..yes it can. Scanners can be set to add a white border. On some scanners that is the default setting.
What you see in Obama's scan is the full document
You have absolutely no way of knowing that.