The FITSH suite consists 15 main tasks which are listed below with their intended use case and types their respective input and outputs.
| Program/Task | Main purpose | Type of input(s) | Type of output(s) | Manual page |
|---|---|---|---|---|
| fiarith | Evaluates arithmetic expressions on images as operands. | One on more FITS image(s), having the same dimension. | A single FITS image. | man/fiarith |
| ficalib | Performs various calibration steps on the input images. | A set of raw FITS images. | A set of calibrated FITS images. | man/ficalib |
| ficombine | Combines (most frequently, averages) a set of images. | A set of FITS images. | A single FITS image. | man/ficombine |
| ficonv | Obtains an optimal convolution transformation between two images or use an existing convolution transformation to convolve an image. | Two FITS images or a single image and a convolution transformation. | A convolution transformation or a single image. | man/ficonv |
| fiheader | Manipulates, i.e. reads, sets, alters or removes some FITS header keywords and/or their values. | A single FITS image (alternation) or more FITS images (if header contents are just read). | A FITS file with altered header or a series of keywords/values from the headers. | man/fiheader |
| fiign | Performs low-level manipulations on masks associated to FITS images. | A single FITS image (with some optional mask). | A single FITS image (with an altered mask). | man/fiign |
| fiinfo | Gives some information about the FITS image in a human-readable form or creates image stamps in a conventional format. | A single FITS image. | Basic information or PNM images. | man/fiinfo |
| fiphot | Performs photometry on normal, convolved or subtracted images. | A single FITS image (with additional reference photometric information if the image is a subtracted one). | Instrumental photometric data. | man/fiphot |
| firandom | Generates artificial object lists and/or artificial (astronomical) images. | List of sources to be drawn to the image or an arithmetic expression that describes how the list of sources is to be created. | List of sources and/or a single FITS image. | man/firandom |
| fistar | Detects and characterizes point-like sources from astronomical images. | A single FITS image. | List of detected sources and an optional PSF image (in FITS format). | man/fistar |
| fitrans | Performs generic geometric (spatial) transformations on the input image. | A single FITS image. | A single, transformed FITS image. | man/fitrans |
| grcollect | Performs data transposition on the input tabulated data or do some sort of statistics on the input data. | A set of files containing tabulated ASCII and/or numeric data. | A set of files containing the transposed tabulated data or a single file for the statistics, also in a tabulated form. | man/grcollect |
| grmatch | Matches lines read from two input files of tabulated data, using various criteria (point matching, coordinate matching or identifier matching). | Two files containing tabulated ASCII and/or numeric data (that must be two point sets in the case of point or coordinate matching). | One file containing the matched lines and in the case of point matching, an additional file that describes the best fit geometric transformation between the two point sets. | man/grmatch |
| grtrans | Transforms a single coordinate list or derives a best-fit transformation between two coordinate lists. | A single file containing a coordinate list and a file that describes the transformation or two files, each one is containing a coordinate list. | A file with the transformed coordinate list in tabulated from or a file that contains the best-fit transformation. | man/grtrans |
| lfit | General purpose arithmetic evaluation, regression and data analysis tool. | File(s) containing data to be analyzed in a tabulated form. | Regression parameters, analysis results or results of the arithmetic evaluation. | man/lfit |