Free rrggbb software for linux

xtermcontrol enables dynamic control of XFree86 xterm properties. xtermcontrol project makes it easy to change colors, titles, fonts, and the geometry of a running xterm, as well as to report the current settings of the properties.
Window manipulations such as (de)iconify, raise and lower, maximize and restore, and reset are also supported. It also lets advanced users issue any xterm control sequence.
Options:
--fg=COLOR
Set foreground color to COLOR.
--bg=COLOR
Set background color to COLOR.
--colorN=COLOR
Set Nth [0-15] color to COLOR.
--highlight=COLOR
Set highlight color to COLOR.
--cursor=COLOR
Set cursor color to COLOR.
--mouse-fg=COLOR
Set mouse pointer foreground color to COLOR.
--mouse-fg=COLOR
Set mouse pointer background color to COLOR.
--font=FONT
Set font name to FONT. Alternatively it is possible to specify a fontmenu index as #[0-6] or navigate the fontmenu by relative sizes as #+N or #-N, where N is an optional integer.
--title=STRING
Set window title. Note that mechanisms like the Bash PROMPT_COMMAND may overwrite the title. Se also How to change the title of an xterm.
--geometry=WIDTHxHEIGHT+XOFF+YOFF
Set size and/or position. Through its control sequences the xterm only recognize positive XOFF and YOFF offsets, which are pixels relative to the upper left hand corner of the display. xtermcontrol is therefore unable to handle negative offsets as described in the X Geometry Specifications and therefore truncates negative values to zero.
--get-fg
Report foreground color.
--get-bg
Report background color.
--get-colorN
Report Nth [0-15] color.
--get-highlight
Report highlight color.
--get-cursor
Report cursor color.
--get-mouse-fg
Report mouse pointer foreground color.
--get-mouse-bg
Report mouse pointer background color.
--get-font
Report font.
--get-title
Report window title.
--get-geometry
Report size and position. The size of the text area is reported in characters and the position is reported in pixels relative to the upper left hand corner of the display.
--maximize
Maximize window.
--restore
Restore maximized window.
--iconify
Iconify window.
--de-iconify
De-iconify window.
--raise
Raise window.
--lower
Lower window.
--reset
Full reset.
--raw=CTLSEQS
Issue the raw control sequences CTLSEQS.
--file=FILE
Force xtermcontrol to read configurations from FILE instead of the standard personal initialization file ~/.xtermcontrol.
--force, -f
Skip TERM environment variable check.
--verbose, -v
Print verbose reports.
--help, -h
Print help and exit.
--version
Print the version number and exit.
Enhancements:
- src/configuration.c: Fix regexp, so the #rrggbb way to specify a color works in configuration file. Reported by Olle Mulmo.
- doc/xtermcontrol.roff: add BUGS section describing how install needs to setuid root on some broken systems.

Color::Calc provides a module which implements simple calculations with RGB colors.
This can be used to create a full color scheme from a few colors.
There are three methods to use the calculation functions: You can create an object, import customised functions into your namespace, or you can access them as class methods.
The module accepts color values in the following formats:
- An arrayref pointing to an array with three elements in the range 0..255 corresponding to the red, green, and blue component.
- A list of three values in the range 0..255 corresponding to the red, green, and blue component where the first value does not have 3 or a multiple of 3 digits (e.g. (0128,128,128)).
- A string containing a hexadecimal RGB value like #RGB/#RRGGBB/#RRRGGGBBB/..., or RGB/RRGGBB/RRRGGGBBB/...
- A color name accepted by Graphics::ColorNames. The interpretation is controlled by the ColorScheme parameter.
- A Graphics::ColorObject reference.

Imager::Color is a Perl module with color handling for Imager.

SYNOPSIS

$color = Imager::Color->new($red, $green, $blue);
$color = Imager::Color->new($red, $green, $blue, $alpha);
$color = Imager::Color->new("#C0C0FF"); # html color specification

$color->set($red, $green, $blue);
$color->set($red, $green, $blue, $alpha);
$color->set("#C0C0FF"); # html color specification

($red, $green, $blue, $alpha) = $color->rgba();
@hsv = $color->hsv(); # not implemented but proposed

$color->info();

if ($color->equals(other=>$other_color)) {
...
}

This module handles creating color objects used by imager. The idea is that in the future this module will be able to handle colorspace calculations as well.

new

This creates a color object to pass to functions that need a color argument.

set

This changes an already defined color. Note that this does not affect any places where the color has been used previously.

rgba

This returns the rgba code of the color the object contains.

info

Calling info merely dumps the relevant colorcode to the log.

equals(other=>$other_color)
equals(other=>$other_color, ignore_alpha=>1)

Compares $self and color $other_color returning true if the color components are the same.

Compares all four channels unless ignore_alpha is set. If ignore_alpha is set only the first three channels are compared.

You can specify colors in several different ways, you can just supply simple values:
simple numeric parameters - if you supply 3 or 4 numeric arguments, you get a color made up of those RGB (and possibly A) components.

a six hex digit web color, either RRGGBB or #RRGGBB
an eight hex digit web color, either RRGGBBAA or #RRGGBBAA.
a 3 hex digit web color, #RGB - a value of F becomes 255.
a color name, from whichever of the gimp Named_Colors file or X rgb.txt is found first. The same as using the name keyword.

You can supply named parameters:

red, green and blue, optionally shortened to r, g and b. The color components in the range 0 to 255.

# all of the following are equivalent
my $c1 = Imager::Color->new(red=>100, blue=>255, green=>0);
my $c2 = Imager::Color->new(r=>100, b=>255, g=>0);
my $c3 = Imager::Color->new(r=>100, blue=>255, g=>0);
hue, saturation and value, optionally shortened to h, s and v, to specify a HSV color. 0 new(hue=>120, value=>1, saturation=>0.5);
web, which can specify a 6 or 3 hex digit web color, in any of the forms #RRGGBB, #RGB, RRGGBB or RGB.
my $c1 = Imager::Color->new(web=>#FFC0C0); # pale red
gray or grey which specifies a single channel, from 0 to 255.
# exactly the same
my $c1 = Imager::Color->new(gray=>128);
my $c1 = Imager::Color->new(grey=>128);
rgb which takes a 3 member arrayref, containing each of the red, green and blue values.
# the same
my $c1 = Imager::Color->new(rgb=>[255, 100, 0]);
my $c1 = Imager::Color->new(r=>255, g=>100, b=>0);
hsv which takes a 3 member arrayref, containting each of hue, saturation and value.
# the same
my $c1 = Imager::Color->new(hsv=>[120, 0.5, 1]);
my $c1 = Imager::Color->new(hue=>120, v=>1, s=>0.5);

gimp which specifies a color from a GIMP palette file. You can specify the filename of the palette file with the palette parameter, or let Imager::Color look in various places, typically "$HOME/gimp-1.x/palettes/Named_Colors" with and without the version number, and in /usr/share/gimp/palettes/. The palette file must have color names.

my $c1 = Imager::Color->new(gimp=>snow);
my $c1 = Imager::Color->new(gimp=>snow, palette=>testimg/test_gimp_pal);

xname which specifies a color from an X11 rgb.txt file. You can specify the filename of the rgb.txt file with the palette parameter, or let Imager::Color look in various places, typically /usr/lib/X11/rgb.txt.

my $c1 = Imager::Color->new(xname=>blue) # usually RGB(0, 0, 255)

builtin which specifies a color from the built-in color table in Imager::Color::Table. The colors in this module are the same as the default X11 rgb.txt file.

my $c1 = Imager::Color->new(builtin=>black) # always RGB(0, 0, 0)

name which specifies a name from either a GIMP palette, an X rgb.txt file or the built-in color table, whichever is found first.

channel0, channel1, etc, each of which specifies a single channel. These can be abbreviated to c0, c1 etc.

channels which takes an arrayref of the channel values.

Optionally you can add an alpha channel to a color with the alpha or a parameter.

These color specifications can be used for both constructing new colors with the new() method and modifying existing colors with the set() method.