Description:
This application obtains a colour and enters it into the
palette portion of the
current graphics device’s colour table. The palette comprises up to 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.
A colour is specified either by the giving the red, green, blue intensities; or named
colours.
Usage:
palentry palnum colour [device]
Parameters:
COLOUR() = LITERAL
(Read)
A colour to be added to the palette at the entry given by Parameter PALNUM. It
is one of the following options.
-
A named colour from the standard colour set, which may be abbreviated. If the
abbreviated name is ambiguous the first match (in alphabetical order) is selected. The
case of the name is ignored. Some examples are "Pink", "Yellow", "Aquamarine", and
"Orchid".
-
Normalised red, green, and blue intensities separated by commas or spaces. Each value
must lie in the range 0.0–1.0. For example, "1.0,1.0,0.5" would give a pale
yellow.
-
An HTML colour code such as #ff002d.
DEVICE = DEVICE (Read)
Name of the graphics
device to be used. [Current graphics device]
PALNUM = _INTEGER (Read)
The number
of the palette entry whose colour is to be modified. PALNUM must lie in the
range zero to the minimum of 15 or the number of colour indices minus one. The
suggested default is 1.
Examples:
palentry 5 gold
This makes palette entry
number 5 have the colour gold in the reserved portion of the colour table of the
current image display. palentry 12 [1.0,1.0,0.3] xwindows
This makes the
xwindows device’s palette entry number 12 have a pale-yellow colour. 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.
Related Applications