use warnings;
use List::Util qw( min max );
-our $VERSION = '1.04';
+our $VERSION = '1.05';
# ITU-R recommendation 601 luma co-efficients
our $kr = .299;
}
sub newyuv {
- # convert from YPbPr values 0..255 (or hex string)
+ # convert from YPbPr values -1..1
my $class = shift;
- my ($y, $cb, $cr) = @_ >= 3 ? @_ : (map {hex} $_[0] =~ /(..)/g);
-
- $_ -= 128 for $cb, $cr;
- $_ /= 255 for $y, $cb, $cr;
+ my ($y, $cb, $cr) = @_;
my @rgb = map { max(0, min(255, $_ * 255)) } (
$y + $cr,
bless \@rgb, $class;
}
+sub newyuv8 {
+ # convert from YPbPr values 0..255 (or hex string)
+ my $class = shift;
+ my ($y, $cb, $cr) = @_ >= 3 ? @_ : (map {hex} $_[0] =~ /(..)/g);
+
+ $_ -= 128 for $cb, $cr;
+ $_ /= 255 for $y, $cb, $cr;
+
+ $class->newyuv($y, $cb, $cr);
+}
+
sub luminance {
# perceived brightness
my ($r, $g, $b) = @{ $_[0] };
use strict;
use 5.010;
-use Shiar_Sheet::Colour '1.02';
+use Shiar_Sheet::Colour '1.05';
+{
html => {
}
# convert to rgb
- $y *= 255 / 32;
- $_ = $_ * 127.5 + 128 for $u, $v;
+ $y /= 32;
+ $_ /= 2 for $u, $v;
Shiar_Sheet::Colour->newyuv($y, $u, $v)->rgb48;
} qw(
0 32 10+5 20-5 12+2 16-2 8+0 24-0
name => 'MSX',
list => [ map {
my ($y, @c) = split /;/;
- $y *= 255;
- $_ = ($_ - .47) / .53 * 127.5 + 128 for @c;
+ $_ = ($_ - .47) / .53 / 2 for @c;
Shiar_Sheet::Colour->newyuv($y, @c)->rgb48;
} qw(
0.00;0.47;0.47 0.00;0.47;0.47 0.53;0.20;0.07 0.67;0.27;0.17