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fitstiff - convert FITS file into TIFF file
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 $NEMODAT/lut.
following parameters are recognized in any order if the keyword is also
fitstiff does not support all known TIFF Classes:
- Input fits file. No default.
- Output tiff
file. No default.
- Planes to select from fits cube [all] Plane
numbers run from 1 to the length of the 3rd axis of the cube.
if to override FITS header value ’DATAMIN’. By default the FITS reader tries
to be smart and searches the FITS header for what the datamin should be.
- Max, if to override FITS header value ’DATAMAX’. See comments above.
- Name of colormap. This may be a full filename, or it’s basename
where a searchpath ".:$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.
- Turn LZW compresssion on?
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.
a tiff file has been constructed, it can be previewed in a number of ways:
- 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.
If your system manager has installed xtiff, it’s straightforward:
If Jef Poskanzer’s PBM package has been installed, the following may also
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.
$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
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