astcrop1

Usage

Overview

Crop is part of GNU Astronomy Utilities 0.23. 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 input image, all overlapping input images will be stitched in the output.

For more information, please run any of the following commands. In particular the second contains a very comprehensive explanation of Crop's invocation: expected input(s), output(s), and a full description of all the options.

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 optional for any corresponding short options.

GNU Astronomy Utilities home page: http://www.gnu.org/software/gnuastro/