PDL::Graphics::LUT3pm
Provides access to a number of look-up tables
Usage
use PDL::Graphics::PGPLOT;use PDL::Graphics::LUT;# what tables are availablemy @tables = lut_names();# get the reversed colour table 'smooth',# with the gamma intensity rampmy ( $l, $r, $g, $b ) = lut_data( 'smooth', 1, 'gamma' );# use the table idl5 in ctabctab( lut_data('idl5') );
Overview
PDL::Graphics::LUT contains a number of colour look-up tables (in rgb format) and intensity ramps, and provides routines to access this data. The format of the data is suitable for use by ctab.
Unlike the initial release of the package, the data tables are now stored within the PDL distribution as FITS files (see "$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.
Functions
lut_names()
Return, as a list, the names of the available colour tables.
@tables = lut_names();lut_ramps()
Return, as a list, the names of the available intensity ramps.
@ramps = lut_ramps();lut_data()
Load in the requested colour table and intensity ramp.
my ( $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 0 if not supplied), then the r, g, and b components are reversed before being returned. If not supplied, $ramp defaults to "ramp" (this is a linear intensity ramp).
The returned values are ndarrays containing values in the range 0 to 1 inclusive, and are floats.
Variables
$tabledir
The directory in which the colour tables (in rgb format) are stored.
$rampdir
The directory in which the intensity ramps are stored.
$suffix
The suffix for the data files in $tabledir and $rampdir.
Further information
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.
Releases
13 releases since Debian 2.2 (Potato); the text changed 12 times.