diff --git a/src/imgdata.rs b/src/imgdata.rs
index 8c85d5b..2408be2 100644
--- a/src/imgdata.rs
+++ b/src/imgdata.rs
@@ -12,16 +12,16 @@ pub struct ThinGridData {
 
 impl ThinGridData {
     /// Convert Grid to ThinGridData
-    pub fn new_from_grid(in_grid: &Grid) -> Self {
+    pub fn new_from_grid(in_grid: Grid) -> Self {
         ThinGridData {
             width: in_grid.width,
             height: in_grid.height,
-            data: in_grid.data.clone(),
+            data: in_grid.data,
         }
     }
 
     pub fn new_from_grid_vec(in_grids: &[Grid]) -> Vec<Self> {
-        in_grids.iter().map(Self::new_from_grid).collect()
+        in_grids.iter().cloned().map(Self::new_from_grid).collect()
     }
 
     /// from grid.rs (needed in image gen)