Description:
This
application reads a
palette of colours from an
NDF , stored as red, green and blue
intensities, to fill the portion of the
current graphics device’s colour table which
is reserved for the palette. The palette comprises 16 colours and is intended to
provide coloured annotations, borders, axes, graphs
etc. that are unaffected
by changes to the
lookup table used for images.
Usage:
palread palette
[device]
Parameters:
DEVICE = DEVICE (Read)
Name of the graphics device to be
used. [
Current graphics device]
PALETTE = NDF (Read)
The name of the NDF
containing the palette of reserved colours as its data array. The palette must be
two-dimensional, the first dimension being 3, and the second 16. If the second
dimension is greater than 16 only the first 16 colours are used; if it has less than
16 just fill as much of the palette as is possible starting from the first
colour. The palette’s values must lie in the range 0.0–1.0.
Examples:
palread rustic
This loads the palette stored in the NDF called rustic into the
reserved portion of the colour table of the current graphics device. palread
rustic xwindows
This loads the palette stored in the NDF called rustic into
the reserved portion of the colour table of the xwindows device. Notes:
-
The effects of this command will only be immediately apparent when run on X windows
which have 256 colours (or other similar pseudocolour devices). On other devices (for
instance, X windows with more than 256 colours) the effects will only become apparent
when subsequent graphics applications are run.
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