<:
sub luminance {
# perceived brightness (using ITU-R recommendation 601 luma co-efficients)
my ($r, $g, $b) = @_;
return $r*.299 + $g*.587 + $b*.114;
}
sub colcell {
my $id = shift;
my @rgb = @_ >= 3 ? @_ : (map {hex} $_[0] =~ /(..)/g);
my $rgb24 = '';
$rgb24 .= sprintf '%X', min($_ / 17 + .5, 15) for @rgb[0..2];
my $rgb48 = '';
$rgb48 .= sprintf '%02X', $_ for @rgb[0..2];
my $inverse = sprintf('%X', luminance(@rgb)/255 < .3 ? 12 : 0) x 3;
return sprintf '| %s | %s | %s'."\n",
"background:#$rgb48; color:#$inverse",
$id,
"background:#000; color:#$rgb48",
$rgb24,
"background:#FFF; color:#$rgb48",
$rgb24,
}
my %col = (
-html => [
qw/black maroon green olive navy purple cyan silver
gray red lime yellow blue fuchsia aqua white/,
qw/reset bold dim italic underline blink fastblink
reverse hidden/,
],
html => [
qw/000000 CCCCCC/,
qw/000000 800000 008000 808000 000080 800080 008080 C0C0C0
808080 FF0000 00FF00 FFFF00 0000FF FF00FF 00FFFF FFFFFF/,
],
cga => [
qw/000000 CCCCCC/,
qw/000000 AA0000 00AA00 AA5500 0000AA AA00AA 00AAAA AAAAAA
555555 FF5555 55FF55 FFFF55 5555FF FF55FF 55FFFF FFFFFF/,
],
xterm => [
qw/000000 CCCCCC/,
qw/000000 CC0000 00CC00 CCCC00 4682B4 CC00CC 00CCCC E5E5E5
4C4C4C FF0000 00FF00 FFFF00 1E90FF FF00FF 00FFFF FFFFFF/,
],
tango => [
qw/000000 CCCCCC/,
qw/2E3436 CC0000 4E9A06 C4A000 3465A4 75507B 06989A D3D7CF
555753 EF2929 8AE234 FCE94F 729FCF AD7FA8 34E2E2 EEEEEC/,
],
);
for my $term (qw/html cga xterm tango/) {
print '- ', "\n";
print '
', "\n";
print "$term\n";
for my $num (0 .. 15) {
my $rgb = $col{$term}[$num + 2];
print '',
colcell($col{"-$term"}[$num] || $num, $rgb, $col{$term}[0]);
}
print " \n\n";
}
:>
88-colour space
<:
for my $r (0 .. 3) {
print '';
for my $g (0 .. 3) {
print '';
for my $b (0 .. 3) {
my $index = $r*4*4 + $g*4 + $b + 16;
print colcell($index, map {(0, 139, 205, 255)[$_]} $r, $g, $b);
}
}
print " \n";
}
print "\n";
print '';
print colcell(80, ($_) x 3) for 46, 92, 115, 139, 162, 185, 208, 231;
print "
\n\n";
:>
256-colour space
<:
for my $r (0 .. 5) {
print '';
for my $g (0 .. 5) {
print '';
for my $b (0 .. 5) {
my $index = $r*6*6 + $g*6 + $b + 16;
print colcell($index, map { $_ && $_*40 + 55 } $r, $g, $b);
}
}
print " \n";
}
print "\n";
for my $row (0, 12) {
print '';
print colcell(232+$_, ($_*10 + 8) x 3) for $row .. $row+11;
print "
\n";
}
print "\n";
:>
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