mHistogram1
None
Usage
mHistogram [-d]
-file
in.fits
minrange
maxrange
[logpower/gaussian/gaussian-log/asinh
[asinh-beta]]
-out
out.hist
Overview
The mViewer application makes PNG/JPEG files using FITS images as input. Part of that processing involves analyzing the FITS files and creating a histogram that is used to inform the transformation from pixel values to display colors/intensities. This processing is done inside mViewer itself.
However, there are situations where it helps to have the histogram earlier. For instance, you may have several images to process into PNGs and wish to use the same histogram-based stretch for each one. Or you may want to generate a set of pixel values that give the visual impression of a color bar (see mPad). Sometimes, you may just want the histogram itself for display or analysis purposes.
The mHistogram module contains the same histogram code as mViewer but writes the results out to an ASCII file which can then be read in by mHistogram, mPad or user programs.
Options
-
-d -
Turn on debugging.
- -file in.fits minrange maxrange [logpower/gaussian/gaussian-log/asinh [asinh-beta]]
-
The FITS image file; stretch range; and (optionally) stretch mode. See the mViewer documentation for more details.
-
-out out.hist -
Output histogram (ASCII) file.
Result
If successful, the result is an ASCII file containing the histogram data, color table lookup mapping, and some other information.
Messages
- ERROR
-
Too few arguments following -file flag
- ERROR
-
Image file badfile invalid FITS
- ERROR
-
Can't find HDU badHDU
- ERROR
-
Too few arguments following -out flag
- ERROR
-
No input FITS file name given
- ERROR
-
No output histogram file name given
- ERROR
-
Cannot open output histogram file.
- ERROR
-
Grayscale/pseudocolor mode but no gray image given
- ERROR
-
FITS library error
- ERROR
-
leading numeric term in 'string' cannot be converted to a finite floating point number
- ERROR
-
not a valid datatype
- ERROR
-
negative percentile
- ERROR
-
percentile context larger than 100
- ERROR
-
extra numeric term in context 'string' cannot be converted to a finite floating point number
- ERROR
-
context 'string' contains trailing junk
Examples
- mHistogram -file SDSS_r.fits -2s max gaussian-log -out SDSS_r.hist
-
[struct stat="OK"]
Releases
5 releases since Debian 9 (Stretch); the text changed 1 time.