+sub newyuv {
+ # convert from YPbPr values -1..1
+ my $class = shift;
+ my ($y, $cb, $cr) = @_;
+
+ my @rgb = map { max(0, min(255, $_ * 255)) } (
+ $y + $cr,
+ $y - $cb * (1 - $kb) * $kb/$kg - $cr * $kr/$kg,
+ $y + $cb * (1 - $kb) ,
+ );
+ 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);
+}
+