Manual Reference Pages - PDL::GRAPHICS::LUT (3)
PDL::Graphics::LUT - provides access to a number of look-up tables
# what tables are available
my @tables = lut_names();
# get the reversed colour table smooth,
# with the gamma intensity ramp
my ( $l, $r, $g, $b ) = lut_data( smooth, 1, gamma );
# use the table idl5 in ctab
ctab( lut_data(idl5) );
PDL::Graphics::LUT contains a number of colour look-up tables
(in rgb format) and intensity ramps, and provides routines to
access this data.
The format of the data is suitable for use by
Unlike the initial release of the package, the data tables are
now stored within the PDL distribution as FITS files
(see $tabledir and $rampdir),
rather than in the module itself.
Changes to these directories will be picked up on the next call
to one of the package functions.
Return, as a list, the names of the available colour tables.
@tables = lut_names();
Return, as a list, the names of the available intensity ramps.
@ramps = lut_ramps();
Load in the requested colour table and intensity ramp.
( $l, $r, $g, $b ) = lut_data( $table, [ $reverse, [ $ramp ] ] );
Returns the levels and r, g, b components of the colour table
$table. If $reverse is 1 (defaults to <B>0B>
if not supplied),
then the r, g, and b components are reversed before being
If not supplied, $ramp defaults to <B>rampB>
(this is a linear intensity ramp).
The returned values are piddles containing values in the range
0 to 1 inclusive, and are floats.
The directory in which the colour tables (in rgb format)
The directory in which the intensity ramps are stored.
The suffix for the data files in $tabledir and
The colour tables were taken from the STARLINK GAIA package,
and are provided under the GNU copyleft.
See http://star-www.rl.ac.uk/ and
http://star-www.dur.ac.uk/~pdraper/ for more details.
Doug Burke (email@example.com), with thanks to
Peter Draper/STARLINK for providing the colour-table data,
and Christian Soeller and Karl Glazebrook for their help.
All rights reserved. There is no warranty. You are allowed
to redistribute this software / documentation under certain
conditions. For details, see the file COPYING in the PDL
distribution. If this file is separated from the PDL distribution,
the copyright notice should be included in the file.
|perl v5.20.3 ||LUT (3) ||2015-08-12 |
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