These sizes are given in parentheses. All of the images below have been contrast stretched . Without this, some of the originals are extremely dark and of low contrast. To get an accurate sense of the inherent difficulty in imaging some of these pages, it is important to have a look at the original. Three different JPEG compression levels are shown in the next three tables.
Compression ratio is the only useful absolute measure.
Creation of this image involved JPEG decompression, scaling and recompression. Since two different JPEG packages were used, some distortion can be introduced by this method, though not nearly of the magnitude as the distortion introduced by scaling down by such a large factor. The same distortion proviso applies. The full size JPEG is in sequential JPEG form as are all the Phase II production images. A means exists to convert a sequential to a progressive JPEG losslessly, provided both are the same size.