1 files changed, 1 insertions, 1 deletions

diff --git a/src/bitmap.rs b/src/bitmap.rs
index ba5c8f1..0b1754a 100644
--- a/src/bitmap.rs
+++ b/src/bitmap.rs
@@ -306,7 +306,7 @@ impl Pixmap<bool> {
     }
 }
 
-fn abs_difference<T: Sub<Output = T> + Ord>(x: T, y: T) -> T {
+pub fn abs_difference<T: Sub<Output = T> + Ord>(x: T, y: T) -> T {
     if x < y {
         y - x
     } else {