/usr/share/sextractor/README is in sextractor 2.4.4-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | This directory contains several ASCII files related to SExtractor
configuration:
default.sex: an example of SExtractor .sex configuration file.
default.param: a .param file, containing all parameters known by SExtractor.
To prevent some parameters to figure in the output catalog,
just erase or comment their names (by adding a # at the
beginning of the line).
default.nnw: a "Neural-Network-Weights" file for star/galaxy separation on
images with Moffat-like PSFs.
*.conv: several "classical" convolution masks for optimal detection:
- default.conv a small pyramidal function (fast),
- gauss*.conv a set of gaussian functions, for
seeing FWHMs between 1.5 and 5 pixels
(best for faint object detection),
- tophat*.conv a set of "top-hat" functions. Use them
to detect extended, low-surface
brightness objects, with a very low
THRESHOLD.
- mexhat*.conv "wavelets", producing a passband-
filtering of the image, tuned to
seeing FWHMs between 1.5 and 5 pixels.
Useful in very crowded star fields,
or in the vicinity of a nebula.
WARNING: may need a high THRESHOLD!!
- block_3x3.conv a small "block" function (for rebinned
images like those of the DeNIS survey).
All these convolution files are normalized by default.
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