GNU Astronomy Utilities


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6.1.4.2 Crop output

The string given to --output option will be interpretted depending on how many crops were requested, see Crop modes:

The header of each output cropped image will contain the names of the input image(s) it was cut from. If a name is longer than the 70 character space that the FITS standard allows for header keyword values, the name will be cut into several keywords from the nearest slash (/). The keywords have the following format: ICFn_m (for Crop File). Where n is the number of the image used in this crop and m is the part of the name (it can be broken into multiple keywords). Following the name is another keyword named ICFnPIX which shows the pixel range from that input image in the same syntax as Crop section syntax. So this string can be directly given to the --section option later.

Once done, a log file can be created in the current directory with the --log option. This file will have three columns and the same number of rows as the number of cropped images. There are also comments on the top of the log file explaining basic information about the run and descriptions for the columns. A short description of the columns is also given below:

  1. The cropped image file name for that row.
  2. The number of input images that were used to create that image.
  3. A 0 if the central few pixels (value to the --checkcenter option) are blank and 1 if they aren’t. When the crop was not defined by its center (see Crop modes), or --checkcenter was given a value of 0 (see Invoking Crop), the center will not be checked and this column will be given a value of -1.

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