Restrict value of grey parameter to valid range

The value passed into the grey method is only valid between 0 and 15.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/lib.rs b/src/lib.rs
index 58b3777..98a3858 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -16,7 +16,7 @@ impl Colour {
         Self { value }
     }
     pub const fn grey(value: u32) -> Self {
-        Self::rgb(value * 0x111111)
+        Self::rgb((value & 0xf) * 0x111111)
     }
     pub const fn from_rgb(red: u8, green: u8, blue: u8) -> Self {
         let mut value = 0x0000ff00;