This HTML automatically generated with rman for NEMO
Table of Contents
fitstiff - convert FITS file into TIFF file
fitstiff [parameter=value]
fitstiff converts a fits(5NEMO)
into a tiff file. The data are
scaled between 0 and 255 as a 8 bit image.
In principle multiple image planes
can be stored in a single tiff file (but the author doesn’t know how to
do it yet).
Although by default there is no colormap written, and the image
is really a 8-bit greyscale, a colormap can be defined from a 256-entry ascii
RGB table, of which examples can be found in $NEMODAT/lut.
The
following parameters are recognized in any order if the keyword is also
given:
- in=fits_file
- Input fits file. No default.
- out=tiff_file
- Output tiff
file. No default.
- planes=p1,p2,...
- Planes to select from fits cube [all] Plane
numbers run from 1 to the length of the 3rd axis of the cube.
- datamin=
- Min,
if to override FITS header value ’DATAMIN’. By default the FITS reader tries
to be smart and searches the FITS header for what the datamin should be.
- datamax=
- Max, if to override FITS header value ’DATAMAX’. See comments above.
- lut=name[.lut]
- Name of colormap. This may be a full filename, or it’s basename
where a searchpath ".:$NEMODAT/lut" will be tried to find the LUT table
file. A default extension ".lut" is assumed. Default: no colortable, the output
TIFF file will be a greyscale map.
- compress=t|f
- Turn LZW compresssion on?
[Default: t].
fitstiff does not support all known TIFF Classes:
- Class B
- for bilevel (1-bit) images. Not supported.
- Class G
- for grayscale
images. This is the default.
- Class P
- for palette color images. Only used
when a RGB look-up table is supplied (see lut=).
- Class R
- for RGB full color
images. Not supported.
- Class F
- For Faxes. Not supported.
The datamin/max
is only attempted to be retrieved from the FITS header, if not given as
an explicit parameter to the program. The data is not scanned.
After
a tiff file has been constructed, it can be previewed in a number of ways:
If your system manager has installed xtiff, it’s straightforward:
xtiff tiff_file
If Jef Poskanzer’s PBM package has been installed, the following may also
work:
tifftopnm < tiff_file | pnmtoxwd | xwud
The public domain package libtiff(3)
contains a number of utilities to
operate on TIFF files, and the SDSC program imconv(1)
converts TIFF to
a variety of other formats.
xtiff(1)
, fits(5NEMO)
, tiffinfo(1)
,
libtiff(3)
Peter Teuben
$NEMODAT/lut directory of ascii RGB look-up tables
xx-nov-91 V0 Created - never used though PJT
15-nov-92 V0.1 smart autoscaling PJT
25-may-95 V0.2 added compress=, fixed bug due to new fitsio PJT
Table of Contents