Most users of the Digital Atlas will find that the files supplied meet their needs (for on-screen viewing and printing) quite adequately. However, in certain circumstances you may wish to resize maps and to adapt them for printing by changing their colour format and file type. This is permitted by the conditions of use of the atlas. No other changes to maps may be made without authorization from NIAS Press. Altering the contents of any map is naturally prohibited.
Map files can be resized and adapted for printing using an image-editing program such as Photoshop. Beforehand, of course, you will need to download the appropriate map file(s).
Apart from using the four display sizes provided, it is possible in programs like Powerpoint to rescale images to fit the screen space available. However, if you need to reformat a map to another display size (i.e. using an image-editing program), be aware that JPEG is a file-compression format that is not very suitable for editing. Images in this format do not scale well because the original arrangement of their pixels needs to be resampled to the new size. Scale too far and the image becomes grainy. Similarly, the more an image is edited, the greater it degrades. For this reason, you will get better results creating a new JPEG of a map from its associated PDF file rather than simply by reformatting one of the four JPEG files.
Adapting for printing
Likewise, for maps intended for printing, use their associated PDF file when converting from colour to grayscale and/or to the TIFF format often requested by publishers.