1. A method for providing actual scale information of a digital raster image, comprising: digitizing a paper document using a digitizing device to create a digital raster image; recording scale information associated with the paper document and scale information of digitizing device, wherein the scale information includes an original scale of the paper document, a dots per inch (DPI) of the digitizing device, and an original size of the paper drawing; embedding the scale information in a tag location of a header of the digital raster image; storing the digital raster image as a single file, wherein said embedded scale information is embedded in said tag location of said header of said single file; and providing a digital image viewer for, rendering the digital raster image, receiving drawing input from a user comprising a line or a shape, calculating a true scale measurement of the drawn line or shape based at least in part on the embedded scale information in said tag location of said header of said single file, and presenting the true scale measurement to the user via the viewer.