diff --git a/lib/Graphics/Toolkit/Color/Space/Format.pm b/lib/Graphics/Toolkit/Color/Space/Format.pm
index 23987d5..856739c 100644
--- a/lib/Graphics/Toolkit/Color/Space/Format.pm
+++ b/lib/Graphics/Toolkit/Color/Space/Format.pm
@@ -96,7 +96,7 @@ sub deformat {
         my $values = $deformatter->( $self, $color );
         next unless $self->basis->is_value_tuple( $values );
         $values = $self->remove_suffix($values, $suffix);
-        return ($values, $name)
+        return wantarray ? ($values, $name) : $values;
     }
     return undef;
 }
diff --git a/lib/Graphics/Toolkit/Color/Space/Instance/CMYK.pm b/lib/Graphics/Toolkit/Color/Space/Instance/CMYK.pm
index 310a81c..cb33d22 100644
--- a/lib/Graphics/Toolkit/Color/Space/Instance/CMYK.pm
+++ b/lib/Graphics/Toolkit/Color/Space/Instance/CMYK.pm
@@ -11,7 +11,7 @@ my $cmyk_def = Graphics::Toolkit::Color::Space->new( axis => [qw/cyan magenta ye
    $cmyk_def->add_converter('RGB', \&to_rgb, \&from_rgb );
 
 sub from_rgb {
-    my ($r, $g, $b) = @_;
+    my ($r, $g, $b) = @{$_[0]};
     return unless defined $b;
     my $km = max($r, $g, $b);
     return (0,0,0,1) unless $km; # prevent / 0
@@ -23,7 +23,7 @@ sub from_rgb {
 }
 
 sub to_rgb {
-    my ($c, $m, $y, $k) = @_;
+    my ($c, $m, $y, $k) = @{$_[0]};
     return ( (1-$c) * (1-$k) ,
              (1-$m) * (1-$k) ,
              (1-$y) * (1-$k) ,
diff --git a/t/12_cmyk_space.t b/t/12_cmyk_space.t
index b85e81b..520e057 100644
--- a/t/12_cmyk_space.t
+++ b/t/12_cmyk_space.t
@@ -11,7 +11,7 @@ my $def = eval "require $module";
 is( not($@), 1, 'could load the module');
 is( ref $def, 'Graphics::Toolkit::Color::Space', 'got tight return value by loading module');
 is( $def->name,       'CMYK',                     'color space has right name');
-is( $def->dimensions,      4,                     'color space has 4 dimensions');
+is( $def->axis,            4,                     'color space has 4 axis');
 
 is( ref $def->in_range([0,0,0, 0]),    'ARRAY',   'check CMYK values works on lower bound values');
 is( ref $def->in_range([1, 1, 1, 1]),  'ARRAY',   'check CMYK values works on upper bound values');
@@ -83,6 +83,7 @@ is( $rgb->[0],   0.3,   'right red value');
 is( $rgb->[1],   0.4,   'right green value');
 is( $rgb->[2],   0.5,   'right blue value');
 
+
 $cmyk = $def->deformat([cmyk => 11, 22, 256, -1]);
 is( int @$cmyk,   4,     'deformat lc named ARRAY: got 4 values');
 is( $cmyk->[0],  11,    'cyan got transported');