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CROP(1) User Commands CROP(1) NAME Crop - crop regions of a dataset SYNOPSIS astcrop [OPTION...] [Crop-Identifier] ASTRdata ... DESCRIPTION Crop is part of GNU Astronomy Utilities 0.24. Crop will create cutouts, thumbnails, postage stamps or crops of region(s) from input image(s) using image or celestial coordinates. If muliple crops are desired, a catalog must be provided. When in WCS mode, if the cut out covers more than one in- put image, all overlapping input images will be stitched in the output. For more information, please run any of the following commands. In particu- lar the second contains a very comprehensive explanation of Crop's invoca- tion: expected input(s), output(s), and a full description of all the op- tions. All options and their values: $ astcrop -P Inputs/Outputs and options: $ info astcrop Full section in manual/book: $ info Crop Full Gnuastro manual/book: $ info gnuastro If you couldn't find your answer in the manual, you can get direct help from experienced Gnuastro users and developers. For more information, please run: $ info help-gnuastro Crop options: Input: --hendwcs=INT Header keyword number to stop reading WCS. --hstartwcs=INT Header keyword number to start reading WCS. -h, --hdu=STR/INT Extension name or number of (all) input(s). -O, --mode=STR Coordinate mode 'img' or 'wcs'. -z, --zeroisnotblank 0.0 in float or double images are not blank. Output: -a, --metaname=STR Name of output HDU (EXTNAME keyword in FITS). -A, --append If output exists, append crop to existing HDUs. -b, --noblank Remove parts of the crop box out of input image. -D, --dontdelete Don't delete output if it exists. -K, --keepinputdir Keep input directory for automatic output. --outfitsnocommit No Git commit in 0-th HDU of output FITS. --outfitsnoconfig No metadata in 0-th HDU of output FITS. --outfitsnodate No 'DATE' in 0-th HDU of output FITS. --outfitsnoversions No versions in 0-th HDU of output FITS. -o, --output=STR Output file name. --primaryimghdu Write crop in primary/zero-th HDU of output. -p, --suffix=STR Suffix (postfix) of cropped images. --tableformat=STR Table fmt: 'fits-ascii', 'fits-binary', 'txt'. -t, --oneelemstdout Print one element's value on stdout. -T, --type=STR Type of output: e.g., int16, float32, etc... --wcslinearmatrix=STR WCS linear matrix of output ('pc' or 'cd'). -X, --widthinpix --width is in pixels (even in WCS mode). Crop by center --checkcenter=FLT/INT Width (in pixels) of box at center to check. -c, --center=FLT[,...] Central coordinates of a single crop. -w, --width=FLT[,...] Width when crop is defined by its center. Crop by center (when a catalog is given) --cathdu=STR/INT HDU of catalog, if it is a FITS table. -C, --catalog=FITS/TXT Input catalog filename. -I, --ignorecase Ignore case in matching/searching columns. -n, --namecol=STR/INT Column no./info of crop filename (no suffix). --searchin=STR Select column(s): 'name', 'unit', 'comment'. -x, --coordcol=STR/INT Column no./info containing coordinates. Crop by region -l, --polygon=FLT,FLT[:...] Polygon vertices, also a DS9 region file. --polygonout Keep the polygon's outside, mask the inside. --polygonsort Sort polygon vertices as counter-clockwise. -s, --section=STR Image section string specifying crop range. Operating modes: -?, --help give this help list --checkconfig List all config files and variables read. --cite BibTeX citation for this program. --config=STR Read configuration file STR immediately. --config-prefix=STR Custom prefix of option names config files. --lastconfig Do not parse any more configuration files. --log Information about output(s) in a log file. --minmapsize=INT Min. bytes to avoid RAM automatically. -N, --numthreads=INT Number of CPU threads to use. --onlyversion=STR Only run if the program version is STR. -P, --printparams Print parameter values to be used and abort. --quietmmap Don't print mmap'd file's name and size. -q, --quiet Only report errors, remain quiet about steps. -S, --setdirconf Set default values for this directory and abort. --usage give a short usage message -U, --setusrconf Set default values for this user and abort. -V, --version print program version Mandatory or optional arguments to long options are also mandatory or op- tional for any corresponding short options. GNU Astronomy Utilities home page: http://www.gnu.org/software/gnuastro/ REPORTING BUGS Report bugs to bug-gnuastro@gnu.org. COPYRIGHT Copyright (C) 2015-2025 Free Software Foundation, Inc. License GPLv3+: GNU General public license version 3 or later. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Written/developed by Mohammad Akhlaghi SEE ALSO The full documentation for Crop is maintained as a Texinfo manual. If the info and Crop programs are properly installed at your site, the command info Crop should give you access to the complete manual. GNU Astronomy Utilities 0.24 November 2025 CROP(1)
NAME | SYNOPSIS | DESCRIPTION | REPORTING BUGS | COPYRIGHT | SEE ALSO
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