mHistogram

Description:

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.

Syntax:
mHistogram [-d] -file in.fits minrange maxrange [logpower/gaussian/gaussian-log] -out out.hist

Switches:

-d
Turn on debugging.
-file in.fits minrange maxrange [logpower/gaussian/gaussian-log]
The FITS image file; stretch range; and (optionally) stretch mode. See the mViewer documentation for more details.
-out out.hist
Output histogram (ASCII) file.
Results:
If successful, the result is an ASCII file containing the histogram data, color table lookup mapping, and some other information.

Examples:

mHistogram -file SDSS_r.fits -2s max gaussian-log -out SDSS_r.hist
[struct stat="OK"]

Return Codes: