See -blue . Set maximum value for reading from the image file. Set minimum value for reading from the image file. This is useful for images when the CCD was not mounted North-up. This is used to skip header information or the first image if two images are stored in one file.
Image file is an unsigned byte array file of the given dimensions.
If the file is square and has no added padding, the dimensions are not necessary. Image file is a unsigned short integer array file of the given dimensions. If the file is square and has no added padding, the dimensions are not necessary. This switch does not override IRAF WCS image coordinates. In verbose mode, informative statements are printed to the terminal window when various actions are taken.