Image Pre-preparation

Astrometric Alignment

Grism Background Subtraction

Reference/API

grizli.prep Module

Align direct images & make mosaics

Functions

add_external_sources([root, maglim, fwhm, ...])	Add Gaussian sources in empty parts of an image derived from an external catalog
align_drizzled_image([root, mag_limits, ...])	Pipeline for astrometric alignment of drizzled image products
apply_persistence_mask(flt_file[, path, ...])	Make a mask for pixels flagged as being affected by persistence
apply_region_mask(flt_file[, dq_value, verbose])	Apply DQ mask from a DS9 region file
apply_region_mask_from_db(flt_file[, ...])	Query the exposure_region_mask table and apply masks
apply_saturated_mask(flt_file[, dq_value, ...])	Saturated WFC3/IR pixels have some pulldown in the opposite amplifier
apply_tweak_shifts(wcs_ref, shift_dict[, ...])	Apply derived shifts to exposure WCS
apply_visit_skyflat(visit[, skyfile, verbose])	Apply the skyflat
asn_to_dict(input_asn)	Convert an ASN file to a dictionary
blot_background([visit, bkg_params, ...])	Blot SEP background of drizzled image back to component FLT images
catalog_exposure_overlaps(ra, dec[, ...])	Count number of items in a list of footprints overlap with catalog positions
check_isJWST([infile])	Check if a file or list of files is JWST image.
check_status()	Make sure all files and modules are in place and print some information if they're not
clean_amplifier_residuals(files[, ...])	Fit and remove a 2D polynomial fit to the detector-frame UVIS/WFC images
clean_drizzle(root[, context, fix_wcs_system])	Zero-out WHT=0 pixels in drizzle mosaics
clip_lists(input, output[, clip])	Clip [x,y] arrays of objects that don't have a match within clip pixels in either direction
compute_SEP_auto_params(data, data_bkg, mask)	Compute SourceExtractor-like AUTO params with sep https://sep.readthedocs.io/en/v1.0.x/apertures.html#equivalent-of-flux-auto-e-g-mag-auto-in-source-extractor
drizzle_footprint(weight_image[, shrink, ...])	Footprint of image pixels where values > 0.
drizzle_overlaps(exposure_groups[, ...])	Combine overlapping visits into single output mosaics
extract_fits_log([file, get_dq])	not used
find_direct_grism_pairs([direct, grism, ...])	Compute pairs of direct and grism exposures
find_single_image_CRs(visit[, simple_mask, ...])	Use LACosmic to find CRs in parts of an ACS mosaic where only one exposure was available
fix_star_centers([root, mag_lim, verbose, ...])	Unset the CR bit (4096) in the centers of bright objects
fresh_flt_file(file[, preserve_dq, path, ...])	Copy "fresh" unmodified version of a data file from some central location
get_SEP_flag_dict()	Get dictionary of SEP integer flags
get_filter_ee_ratio(tab, filter[, ref_filter])	Relative EE correction within a specified aperture, in arcsec.
get_hst_aperture_correction(filter[, raper, ...])	Get single aperture correction from tabulated EE curve
get_jwst_wfssbkg_file(file[, valid_flat, ...])	Divide flat-field from NIRISS wfssbkg file
get_kron_tot_corr(tab, filter[, inst, ...])	Compute total correction from tabulated EE curves
get_nircam_wisp_filename(header)	Get the path to an appropriate NIRCam wisp template file, assuming the templates are stored in [GRIZLI_PATH]/CONF/NircamWisp
get_rotated_column_average(data, mask, theta)	Get median along an image axis after rotating by and angle theta, e.g., for long NIRcam diffraction spikes
get_seg_iso_flux(data, seg, tab[, err, ...])	Integrate flux within the segmentation regions.
get_vexas_catalog([ra, dec, radius, ...])	VEXAS DR2 from vizier
get_vhs_catalog([ra, dec, radius, corners, ...])	VEXAS DR2 from vizier
get_visit_radec_from_database(visit[, nmax])	Get reference astrometry from grizli database
get_wfc3ir_kron_tot_corr(tab, filter[, ...])	Compute total correction from WFC3/IR EE curves
iterate_tweak_align(direct, grism[, ...])	Iterate tweak_align aligning exposures to a mosaic created from those exposures
log_wcs(root, drz_wcs, shift, rot, scale[, ...])	Save WCS offset information to an ascii file
make_SEP_FLT_catalog(flt_file[, ext, ...])	Make a catalog from a FLT file
make_SEP_catalog([root, sci, wht, ...])	Make a catalog from drizzle products using the SEP implementation of SourceExtractor
make_SEP_catalog_from_arrays(sci, err, mask)	Make a catalog from arrays using sep
make_drz_catalog([root, sexpath, threshold, ...])	Make a SExtractor catalog from drizzle products
make_visit_average_flat(visit[, clip_max, ...])	Make an average "skyflat" for exposures in a visit, e.g., for MIRI
manual_alignment(visit, ds9[, reference, ...])	Manual alignment of a visit with respect to an external region file
mask_snowballs(visit[, snowball_erode, ...])	Mask JWST IR snowballs
match_direct_grism_wcs([direct, grism, ...])	Match WCS of grism exposures to corresponding direct images
match_lists(input, output[, transform, scl, ...])	Compute matched objects and transformation between two (x,y) lists.
nircam_wisp_correction(calibrated_file[, ...])	Fit the NIRCam wisp template and subtract
oneoverf_column_correction(visit[, ...])	Masked column/row correction for 1/f noise in JWST exposures
process_direct_grism_visit([direct, grism, ...])	Full processing of a direct (+grism) image visit.
region_mask_from_ds9([ext])	Get a region masks from a local DS9 window and make a table that can be sent to the exposure_region_mask database table.
separate_chip_sky(visit[, filters, ...])	Get separate background values for each chip.
set_grism_dfilter(direct, grism)	Set direct imaging filter for grism exposures
subtract_visit_angle_averages(visit[, ...])	Subtract angle averages from exposures in a visit group
tweak_align([direct_group, grism_group, ...])	Intra-visit shift alignment
tweak_flt([files, max_dist, threshold, ...])	Refine shifts of FLT files
update_wcs_fits_log(file, wcs_ref[, ...])	Make FITS log when updating WCS
visit_grism_sky([grism, apply, ...])	Subtract sky background from grism exposures