Provided by: fitspng_1.4-1build2_amd64 
NAME
fitspng - FITS to PNG converter.
SYNOPSIS
fitspng [options] file(s)
DESCRIPTION
Fitspng is an utility intended to convert of images in astronomical FITS format to computer graphics PNG
format.
The primary goal of fitspng is to transform of the high dynamic images to a limited numerical range of
PNG format. The transformation uses global tone mapping by a set of tone functions with machine estimated
or user provided scaling parameters.
The detailed description can be found at homepage: http://integral.physics.muni.cz/fitspng
OPTIONS
-f [linear|asinh|log|gamma|normal|sqrt|sqr|logistic|atan]
Scale output intensities by specified profile: linearly, asinh, log, gamma (as in sRGB), normal
(Gauss cumulative distribution function [5]), square root, square, logistic (emulating classical
photography sensitivity [6]), atan and ratio (x/1+x).
-f0 f Specifies scale of output profile: f*Func(i).
-fz z Specifies zero (black level) of output profile: Func(i) + z.
-fr u,v
Output intensities, in case of colour depth 8 bites, are scaled according this formula: (output
intensities) = Func((input intensities - (med - u*mad))/(mad/v)) where med is median of every 10
pixel in the image, mad is mean of positive deviations from the median of every 10 pixel (same
frequency). If the pixel is out of level range from 0 to 255, than value is replaced by 0 and 255
respectively. The default is u = 3, v = 1/3.
-fl t,s
Output intensities, in case of colour depth 8 bites, are scaled according this formula: (output
intensities) = Func((input intensities - t)/s). The setup completely disable internal parameter
estimation.
-fs x The colour saturation is multiplied by the given ratio (for colour FITS only).
-fw x,y
Set coordinates of white point.
-fn st,ss
When used, switch-on mode which emulates humans night vision. It is useful only for colour FITS.
-cs sRGB or AdobeRGB
Select the colour-space of output image.
-s s Shrink image: scale down the size of image by the specified factor s as a (non-zero) positive
integer number. If the s factor is greater of one, any output pixel is constructed as arithmetic
mean of s*s input pixels.
-o Specify an output file name, valid only if a single file is passed.
If this switch is omitted, the output filename is determined by modification of input filenames:
suffixes, like *.fits, are replaced by *.png, and the directory path is removed. The approach
leaves original data untouched, results are stored in current working directory.
-B [8|16]
8 bites per pixel of colour (gray) depth of output. This is default. 16 bites per pixel of colour
(gray) depth of output. There is frequently problem with additional rendering. Most of utilities
doesn't work with this colour depth correctly. On the other side, 16 bit per pixel images has
saved photometric content more precisely.
-v Print additional info during processing.
--help Show summary of options.
--version
Display software version.
EXAMPLES
Convert an image from FITS to PNG:
$ fitspng -o gray.png gray.fits
Emulate human's night vision:
$ fitspng -fn 100,10 -o scotopic.png colour.fits
Emulate classical photography sensitivity function (density curve):
$ fitspng -f logistic -o photo.png colour.fits
Create semi-gray image:
$ fitspng -fs 0.2 -o reduced.png colour.fits
Select the specified band from colour FITS (with help of FITS file name extension):
$ fitspng -o green.png "colour.fits[1]"
Create thumbnails:
$ fitspng -s 10 *.fits
AUTHOR
Filip Hroch <hroch@physics.muni.cz>
SEE ALSO
rawtran(1)
[1] http://integral.physics.muni.cz/fitspng
[2] http://munipack.physics.muni.cz/
[3] http://integral.physics.muni.cz/rawtran
Fitspng January 2019 FITSPNG(1)