"GraphicsOriginalSize"

"GraphicsOriginalSize" is a front end token that restores all selected graphics to their default size.

For PICT, QuickTime, and Bitmap graphics, the graphic itself defines its normal size (Macintosh only). For PostScript graphics, the standard size is determined by the aspect ratio defined within the graphic or by the BoundingBox PostScript comment, if present.

To execute a front end token, you typically evaluate a command of the form FrontEndExecute[FrontEndToken[token]].