... It doesn't actually make any difference whether it's Z or Gauge 1 -- the image on the sketchboad (and the workpad) is exactly the same. Only the numbers along the bottom would be different. Remove those from the screenshot and it is impossible to determine the scale from the image alone. Only when construction templates are printed full-size is there any difference. In that case, the images are significantly enlarged rather than shrunk, so there is no loss of detail. Since you explained about the re-sampling algorithm's used to process the images in sketchboard and workpad, it has now become clearer that the images, as you say remain the same irrespective of scale size and my concerns about smaller scales is no longer valid. I suggested those figures before I saw your work! But even then it was only intended as an indication of the order of magnitude -- i.e. pixels measured in hundreds rather than several thousands. Don't worry about the file size in KB -- provided you save in GIF or PNG format with no intermediate ...