diff --git a/src/color/channel.rs b/src/color/channel.rs
index c740da1..eb3879f 100644
--- a/src/color/channel.rs
+++ b/src/color/channel.rs
@@ -2,17 +2,17 @@ pub trait Channel {
     static pure fn channel_max() -> self;
     
     static pure fn from_channel<T:Channel>(val: T) -> self;
-    pure fn convert_channel<T:Channel>() -> T;
+    pure fn convert_channel<T:Channel>(&self) -> T;
     
-    pure fn to_channel_u8()    -> u8;
-    pure fn to_channel_u16()   -> u16;
-    pure fn to_channel_u32()   -> u32;
-    pure fn to_channel_u64()   -> u64;
-    pure fn to_channel_f32()   -> f32;
-    pure fn to_channel_f64()   -> f64;
-    pure fn to_channel_float() -> float;
+    pure fn to_channel_u8(&self)    -> u8;
+    pure fn to_channel_u16(&self)   -> u16;
+    pure fn to_channel_u32(&self)   -> u32;
+    pure fn to_channel_u64(&self)   -> u64;
+    pure fn to_channel_f32(&self)   -> f32;
+    pure fn to_channel_f64(&self)   -> f64;
+    pure fn to_channel_float(&self) -> float;
     
-    pure fn inverse() -> self;
+    pure fn inverse(&self) -> self;
 }
 
 pub pure fn convert_channel<T:Channel, U:Channel>(val: T) -> U { val.convert_channel() }
@@ -21,118 +21,118 @@ pub impl u8: Channel {
     #[inline(always)] static pure fn channel_max() -> u8 { 0xFF }  // 2^8
     
     #[inline(always)] static pure fn from_channel<T:Channel>(val: T) -> u8 { val.to_channel_u8() }
-    #[inline(always)] pure fn convert_channel<T:Channel>() -> T { from_channel(self) }
+    #[inline(always)] pure fn convert_channel<T:Channel>(&self) -> T { from_channel(*self) }
     
-    #[inline(always)] pure fn to_channel_u8()    -> u8    { self }
-    #[inline(always)] pure fn to_channel_u16()   -> u16   { (self as u16 << 8) | self as u16 }
-    #[inline(always)] pure fn to_channel_u32()   -> u32   { (self.to_channel_u16() as u32 << 16) | self.to_channel_u16() as u32 }
-    #[inline(always)] pure fn to_channel_u64()   -> u64   { (self.to_channel_u32() as u64 << 32) | self.to_channel_u32() as u64 }
-    #[inline(always)] pure fn to_channel_f32()   -> f32   { (self as f32)   / (0xFF as f32)   }
-    #[inline(always)] pure fn to_channel_f64()   -> f64   { (self as f64)   / (0xFF as f64)   }
-    #[inline(always)] pure fn to_channel_float() -> float { (self as float) / (0xFF as float) }
+    #[inline(always)] pure fn to_channel_u8(&self)    -> u8    { (*self) }
+    #[inline(always)] pure fn to_channel_u16(&self)   -> u16   { (*self as u16 << 8) | (*self) as u16 }
+    #[inline(always)] pure fn to_channel_u32(&self)   -> u32   { (self.to_channel_u16() as u32 << 16) | self.to_channel_u16() as u32 }
+    #[inline(always)] pure fn to_channel_u64(&self)   -> u64   { (self.to_channel_u32() as u64 << 32) | self.to_channel_u32() as u64 }
+    #[inline(always)] pure fn to_channel_f32(&self)   -> f32   { (*self as f32)   / (0xFF as f32)   }
+    #[inline(always)] pure fn to_channel_f64(&self)   -> f64   { (*self as f64)   / (0xFF as f64)   }
+    #[inline(always)] pure fn to_channel_float(&self) -> float { (*self as float) / (0xFF as float) }
     
-    #[inline(always)] pure fn inverse() -> u8 { !self }
+    #[inline(always)] pure fn inverse(&self) -> u8 { !(*self) }
 }
 
 pub impl u16: Channel {
     #[inline(always)] static pure fn channel_max() -> u16 { 0xFFFF }   // 2^16
     
     #[inline(always)] static pure fn from_channel<T:Channel>(val: T) -> u16 { val.to_channel_u16() }
-    #[inline(always)] pure fn convert_channel<T:Channel>() -> T { from_channel(self) }
+    #[inline(always)] pure fn convert_channel<T:Channel>(&self) -> T { from_channel(*self) }
     
-    #[inline(always)] pure fn to_channel_u8()    -> u8    { (self >> 8) as u8 }    // this is the equivalent of `self/256`. Some folks prefer to do `self/257`
-    #[inline(always)] pure fn to_channel_u16()   -> u16   { self }
-    #[inline(always)] pure fn to_channel_u32()   -> u32   { (self as u32 << 16) | self as u32 }
-    #[inline(always)] pure fn to_channel_u64()   -> u64   { (self.to_channel_u32() as u64 << 32) | self.to_channel_u32() as u64 }
-    #[inline(always)] pure fn to_channel_f32()   -> f32   { self / 0xFFFF as f32   }
-    #[inline(always)] pure fn to_channel_f64()   -> f64   { self / 0xFFFF as f64   }
-    #[inline(always)] pure fn to_channel_float() -> float { self / 0xFFFF as float }
+    #[inline(always)] pure fn to_channel_u8(&self)    -> u8    { (*self >> 8) as u8 }    // this is the equivalent of `self/256`. Some folks prefer to do `self/257`
+    #[inline(always)] pure fn to_channel_u16(&self)   -> u16   { (*self) }
+    #[inline(always)] pure fn to_channel_u32(&self)   -> u32   { (*self as u32 << 16) | (*self) as u32 }
+    #[inline(always)] pure fn to_channel_u64(&self)   -> u64   { (self.to_channel_u32() as u64 << 32) | self.to_channel_u32() as u64 }
+    #[inline(always)] pure fn to_channel_f32(&self)   -> f32   { (*self) / 0xFFFF as f32   }
+    #[inline(always)] pure fn to_channel_f64(&self)   -> f64   { (*self) / 0xFFFF as f64   }
+    #[inline(always)] pure fn to_channel_float(&self) -> float { (*self) / 0xFFFF as float }
     
-    #[inline(always)] pure fn inverse() -> u16 { !self }
+    #[inline(always)] pure fn inverse(&self) -> u16 { !(*self) }
 }
 
 pub impl u32: Channel {
     #[inline(always)] static pure fn channel_max() -> u32 { 0xFFFF_FFFF }   // 2^32
     
     #[inline(always)] static pure fn from_channel<T:Channel>(val: T) -> u32 { val.to_channel_u32() }
-    #[inline(always)] pure fn convert_channel<T:Channel>() -> T { from_channel(self) }
+    #[inline(always)] pure fn convert_channel<T:Channel>(&self) -> T { from_channel(*self) }
     
-    #[inline(always)] pure fn to_channel_u8()    -> u8    { (self >> 24) as u8 }
-    #[inline(always)] pure fn to_channel_u16()   -> u16   { (self >> 16) as u16 }
-    #[inline(always)] pure fn to_channel_u32()   -> u32   { self }
-    #[inline(always)] pure fn to_channel_u64()   -> u64   { (self as u64 << 32) | self as u64 }
-    #[inline(always)] pure fn to_channel_f32()   -> f32   { self / 0xFFFF_FFFF as f32   }
-    #[inline(always)] pure fn to_channel_f64()   -> f64   { self / 0xFFFF_FFFF as f64   }
-    #[inline(always)] pure fn to_channel_float() -> float { self / 0xFFFF_FFFF as float }
+    #[inline(always)] pure fn to_channel_u8(&self)    -> u8    { (*self >> 24) as u8 }
+    #[inline(always)] pure fn to_channel_u16(&self)   -> u16   { (*self >> 16) as u16 }
+    #[inline(always)] pure fn to_channel_u32(&self)   -> u32   { (*self) }
+    #[inline(always)] pure fn to_channel_u64(&self)   -> u64   { (*self as u64 << 32) | (*self) as u64 }
+    #[inline(always)] pure fn to_channel_f32(&self)   -> f32   { (*self) / 0xFFFF_FFFF as f32   }
+    #[inline(always)] pure fn to_channel_f64(&self)   -> f64   { (*self) / 0xFFFF_FFFF as f64   }
+    #[inline(always)] pure fn to_channel_float(&self) -> float { (*self) / 0xFFFF_FFFF as float }
     
-    #[inline(always)] pure fn inverse() -> u32 { !self }
+    #[inline(always)] pure fn inverse(&self) -> u32 { !(*self) }
 }
 
 pub impl u64: Channel {
     #[inline(always)] static pure fn channel_max() -> u64 { 0xFFFF_FFFF_FFFF_FFFF_u64 }   // 2^64
     
     #[inline(always)] static pure fn from_channel<T:Channel>(val: T) -> u64 { val.to_channel_u64() }
-    #[inline(always)] pure fn convert_channel<T:Channel>() -> T { from_channel(self) }
+    #[inline(always)] pure fn convert_channel<T:Channel>(&self) -> T { from_channel(*self) }
     
-    #[inline(always)] pure fn to_channel_u8()    -> u8    { (self >> 56) as u8 }
-    #[inline(always)] pure fn to_channel_u16()   -> u16   { (self >> 48) as u16 }
-    #[inline(always)] pure fn to_channel_u32()   -> u32   { (self >> 32) as u32 }
-    #[inline(always)] pure fn to_channel_u64()   -> u64   { self }
-    #[inline(always)] pure fn to_channel_f32()   -> f32   { self / 0xFFFF_FFFF_FFFF_FFFF_u64 as f32   }
-    #[inline(always)] pure fn to_channel_f64()   -> f64   { self / 0xFFFF_FFFF_FFFF_FFFF_u64 as f64   }
-    #[inline(always)] pure fn to_channel_float() -> float { self / 0xFFFF_FFFF_FFFF_FFFF_u64 as float }
+    #[inline(always)] pure fn to_channel_u8(&self)    -> u8    { (*self >> 56) as u8 }
+    #[inline(always)] pure fn to_channel_u16(&self)   -> u16   { (*self >> 48) as u16 }
+    #[inline(always)] pure fn to_channel_u32(&self)   -> u32   { (*self >> 32) as u32 }
+    #[inline(always)] pure fn to_channel_u64(&self)   -> u64   { (*self) }
+    #[inline(always)] pure fn to_channel_f32(&self)   -> f32   { (*self) / 0xFFFF_FFFF_FFFF_FFFF_u64 as f32   }
+    #[inline(always)] pure fn to_channel_f64(&self)   -> f64   { (*self) / 0xFFFF_FFFF_FFFF_FFFF_u64 as f64   }
+    #[inline(always)] pure fn to_channel_float(&self) -> float { (*self) / 0xFFFF_FFFF_FFFF_FFFF_u64 as float }
     
-    #[inline(always)] pure fn inverse() -> u64 { !self }
+    #[inline(always)] pure fn inverse(&self) -> u64 { !(*self) }
 }
 
 pub impl f32: Channel {
     #[inline(always)] static pure fn channel_max() -> f32 { 1f32 }
     
     #[inline(always)] static pure fn from_channel<T:Channel>(val: T) -> f32 { val.to_channel_f32() }
-    #[inline(always)] pure fn convert_channel<T:Channel>() -> T { from_channel(self) }
+    #[inline(always)] pure fn convert_channel<T:Channel>(&self) -> T { from_channel(*self) }
     
     
-    #[inline(always)] pure fn to_channel_u8()    -> u8    { self * (0xFF_u8         as f32) as u8  }
-    #[inline(always)] pure fn to_channel_u16()   -> u16   { self * (0xFFFF_u16      as f32) as u16 }
-    #[inline(always)] pure fn to_channel_u32()   -> u32   { fail(~"to_channel_u32 not yet implemented for f32") }
-    #[inline(always)] pure fn to_channel_u64()   -> u64   { fail(~"to_channel_u64 not yet implemented for f32") }
-    #[inline(always)] pure fn to_channel_f32()   -> f32   { self }
-    #[inline(always)] pure fn to_channel_f64()   -> f64   { self as f64 }
-    #[inline(always)] pure fn to_channel_float() -> float { self as float }
+    #[inline(always)] pure fn to_channel_u8(&self)    -> u8    { (*self) * (0xFF_u8         as f32) as u8  }
+    #[inline(always)] pure fn to_channel_u16(&self)   -> u16   { (*self) * (0xFFFF_u16      as f32) as u16 }
+    #[inline(always)] pure fn to_channel_u32(&self)   -> u32   { fail(~"to_channel_u32 not yet implemented for f32") }
+    #[inline(always)] pure fn to_channel_u64(&self)   -> u64   { fail(~"to_channel_u64 not yet implemented for f32") }
+    #[inline(always)] pure fn to_channel_f32(&self)   -> f32   { (*self) }
+    #[inline(always)] pure fn to_channel_f64(&self)   -> f64   { (*self) as f64 }
+    #[inline(always)] pure fn to_channel_float(&self) -> float { (*self) as float }
     
-    #[inline(always)] pure fn inverse() -> f32 { 1.0 - self }
+    #[inline(always)] pure fn inverse(&self) -> f32 { 1f32 - (*self) }
 }
 
 pub impl f64: Channel {
     #[inline(always)] static pure fn channel_max() -> f64 { 1f64 }
     
     #[inline(always)] static pure fn from_channel<T:Channel>(val: T) -> f64 { val.to_channel_f64() }
-    #[inline(always)] pure fn convert_channel<T:Channel>() -> T { from_channel(self) }
+    #[inline(always)] pure fn convert_channel<T:Channel>(&self) -> T { from_channel(*self) }
     
-    #[inline(always)] pure fn to_channel_u8()    -> u8    { self * (0xFFu8    as f64) as u8  }
-    #[inline(always)] pure fn to_channel_u16()   -> u16   { self * (0xFFFFu16 as f64) as u16 }
-    #[inline(always)] pure fn to_channel_u32()   -> u32   { fail(~"to_channel_u32 not yet implemented for f64") }
-    #[inline(always)] pure fn to_channel_u64()   -> u64   { fail(~"to_channel_u64 not yet implemented for f64") }
-    #[inline(always)] pure fn to_channel_f32()   -> f32   { self as f32 }
-    #[inline(always)] pure fn to_channel_f64()   -> f64   { self }
-    #[inline(always)] pure fn to_channel_float() -> float { self as float }
+    #[inline(always)] pure fn to_channel_u8(&self)    -> u8    { (*self) * (0xFFu8    as f64) as u8  }
+    #[inline(always)] pure fn to_channel_u16(&self)   -> u16   { (*self) * (0xFFFFu16 as f64) as u16 }
+    #[inline(always)] pure fn to_channel_u32(&self)   -> u32   { fail(~"to_channel_u32 not yet implemented for f64") }
+    #[inline(always)] pure fn to_channel_u64(&self)   -> u64   { fail(~"to_channel_u64 not yet implemented for f64") }
+    #[inline(always)] pure fn to_channel_f32(&self)   -> f32   { (*self) as f32 }
+    #[inline(always)] pure fn to_channel_f64(&self)   -> f64   { (*self) }
+    #[inline(always)] pure fn to_channel_float(&self) -> float { (*self) as float }
     
-    #[inline(always)] pure fn inverse() -> f64 { 1.0 - self }
+    #[inline(always)] pure fn inverse(&self) -> f64 { 1f64 - (*self) }
 }
 
 pub impl float: Channel {
     #[inline(always)] static pure fn channel_max() -> float { 1f }
     
     #[inline(always)] static pure fn from_channel<T:Channel>(val: T) -> float { val.to_channel_float() }
-    #[inline(always)] pure fn convert_channel<T:Channel>() -> T { from_channel(self) }
+    #[inline(always)] pure fn convert_channel<T:Channel>(&self) -> T { from_channel(*self) }
     
-    #[inline(always)] pure fn to_channel_u8()    -> u8    { self * (0xFFu8    as float) as u8  }
-    #[inline(always)] pure fn to_channel_u16()   -> u16   { self * (0xFFFFu16 as float) as u16 }
-    #[inline(always)] pure fn to_channel_u32()   -> u32   { fail(~"to_channel_u32 not yet implemented for float") }
-    #[inline(always)] pure fn to_channel_u64()   -> u64   { fail(~"to_channel_u64 not yet implemented for float") }
-    #[inline(always)] pure fn to_channel_f32()   -> f32   { self as f32 }
-    #[inline(always)] pure fn to_channel_f64()   -> f64   { self as f64 }
-    #[inline(always)] pure fn to_channel_float() -> float { self }
+    #[inline(always)] pure fn to_channel_u8(&self)    -> u8    { (*self) * (0xFFu8    as float) as u8  }
+    #[inline(always)] pure fn to_channel_u16(&self)   -> u16   { (*self) * (0xFFFFu16 as float) as u16 }
+    #[inline(always)] pure fn to_channel_u32(&self)   -> u32   { fail(~"to_channel_u32 not yet implemented for float") }
+    #[inline(always)] pure fn to_channel_u64(&self)   -> u64   { fail(~"to_channel_u64 not yet implemented for float") }
+    #[inline(always)] pure fn to_channel_f32(&self)   -> f32   { (*self) as f32 }
+    #[inline(always)] pure fn to_channel_f64(&self)   -> f64   { (*self) as f64 }
+    #[inline(always)] pure fn to_channel_float(&self) -> float { (*self) }
     
-    #[inline(always)] pure fn inverse() -> float { 1.0 - self }
+    #[inline(always)] pure fn inverse(&self) -> float { 1f - (*self) }
 }
\ No newline at end of file