floatbg(1x) [debian man page]
floatbg(1X) floatbg(1X) NAME
floatbg - slowly modify the color of the X root window SYNTAX
floatbg [-display display] [-help] [-gnome] [-xfce] [-value float] [-satmid float] [-satvar float] [-fase float] [-time float] DESCRIPTION
Floatbg is an X11 program that modifies the color of the root window in such a manner that you won't see the color change, but after a while you'll notice that it did change, however. Floatbg starts with a random color and changes it deterministically by moving through an hsv-model of colors. In the hsv-model, colors are described by three parameters: Hue stands for the tint of a color (0 degrees is red, 60 = yellow, 120 = green, 180 = aquamarine, etc), sat- urations stands for the brightness of the color (0 = white, 1 = bright), and value stands for the intensity of the color (0 = black, 1 = normal). Every 10 seconds the hue (tint) is increased by one degree and the saturation (brightness) is changed by a sinus over the hue. (The fre- quency of this change can be adjusted with the -time parameter.) The shape of this sinus can be adapted with the options -satmid, -satvar and -fase. The value (blackness) is fixed and can be set with the option -value. The default values are: floatbg -value .87 -satmid .375 -satvar .125 -fase .25, and are such that all pastel tints are visited. Extremely simplistic Gnome and Xfce support can be enabled with the -gnome and -xfce flags. BUGS
Floatbg doesn't use any window, button or menu, and it can only be stopped by killing it. AUTHOR
Jan Rekers - rekers@cwi.nl floatbg(1X)
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Imager::Color(3pm) User Contributed Perl Documentation Imager::Color(3pm) NAME
Imager::Color - Color handling for Imager. SYNOPSIS
use Imager; $color = Imager::Color->new($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(); $color->info(); if ($color->equals(other=>$other_color)) { ... } DESCRIPTION
This module handles creating color objects used by Imager. The idea is that in the future this module will be able to handle color space calculations as well. An Imager color consists of up to four components, each in the range 0 to 255. Unfortunately the meaning of the components can change depending on the type of image you're dealing with: o for 3 or 4 channel images the color components are red, green, blue, alpha. o for 1 or 2 channel images the color components are gray, alpha, with the other two components ignored. An alpha value of zero is fully transparent, an alpha value of 255 is fully opaque. METHODS
new This creates a color object to pass to functions that need a color argument. set This changes an already defined color. Note that this does not affect any places where the color has been used previously. rgba() This returns the red, green, blue and alpha channels of the color the object contains. info Calling info merely dumps the relevant color to the log. equals(other=>$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: o simple numeric parameters - if you supply 3 or 4 numeric arguments, you get a color made up of those RGB (and possibly A) components. o a six hex digit web color, either "RRGGBB" or "#RRGGBB" o an eight hex digit web color, either "RRGGBBAA" or "#RRGGBBAA". o a 3 hex digit web color, "#RGB" - a value of F becomes 255. o 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: o '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); o "hue", "saturation" and "value", optionally shortened to "h", "s" and "v", to specify a HSV color. 0 <= hue < 360, 0 <= s <= 1 and 0 <= v <= 1. # the same as RGB(127,255,127) my $c1 = Imager::Color->new(hue=>120, v=>1, s=>0.5); my $c1 = Imager::Color->new(hue=>120, value=>1, saturation=>0.5); o "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 o "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); o "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); o "hsv" which takes a 3 member arrayref, containing each of hue, saturation and value. # the same my $c1 = Imager::Color->new(hsv=>[120, 0.5, 1]); my $c1 = Imager::Color->new(hue=>120, v=>1, s=>0.5); o "gimp" which specifies a color from a GIMP palette file. You can specify the file name of the palette file with the 'palette' parameter, or let Imager::Color look in various places, typically "$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); o "xname" which specifies a color from an X11 "rgb.txt" file. You can specify the file name 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) o "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 $c1 = Imager::Color->new(builtin=>'black') # always RGB(0, 0, 0) o "name" which specifies a name from either a GIMP palette, an X "rgb.txt" file or the built-in color table, whichever is found first. o 'channel0', 'channel1', etc, each of which specifies a single channel. These can be abbreviated to 'c0', 'c1' etc. o 'channels' which takes an arrayref of the channel values. Optionally you can add an alpha channel to a color with the 'alpha' or 'a' parameter. These color specifications can be used for both constructing new colors with the new() method and modifying existing colors with the set() method. METHODS
hsv() my($h, $s, $v, $alpha) = $color->hsv(); Returns the color as a Hue/Saturation/Value/Alpha tuple. AUTHOR
Arnar M. Hrafnkelsson, addi@umich.edu And a great deal of help from others - see the "README" for a complete list. SEE ALSO
Imager(3), Imager::Color http://imager.perl.org/ perl v5.14.2 2011-06-06 Imager::Color(3pm)