diff --git a/src/imgdata.rs b/src/imgdata.rs
index 7abf72e..1259cf0 100644
--- a/src/imgdata.rs
+++ b/src/imgdata.rs
@@ -29,13 +29,6 @@ impl ThinGridData {
     }
 
     // from grid.rs (needed in image gen)
-    #[allow(dead_code)]
-    pub fn data(&self) -> &[f32] {
-        &self.data
-    }
-
-    // from grid.rs (needed in image gen)
-    #[allow(dead_code)]
     pub fn quantile(&self, fraction: f32) -> f32 {
         let index = if (fraction - 1.0_f32).abs() < f32::EPSILON {
             self.data.len() - 1
@@ -58,7 +51,7 @@ pub struct ImgData {
 }
 
 impl ImgData {
-    pub fn new(in_grids: Vec<ThinGridData>, in_palette: Palette) -> Self {
+    pub const fn new(in_grids: Vec<ThinGridData>, in_palette: Palette) -> Self {
         ImgData {
             grids: in_grids,
             palette: in_palette,
@@ -82,7 +75,7 @@ impl ImgData {
                 for (grid, max_value, color) in
                     multizip((&self.grids, &max_values, &self.palette.colors))
                 {
-                    let mut t = (grid.data()[i] / max_value).clamp(0.0, 1.0);
+                    let mut t = (grid.data[i] / max_value).clamp(0.0, 1.0);
                     t = t.powf(1.0 / 2.2); // gamma correction
                     r += color.0[0] as f32 * t;
                     g += color.0[1] as f32 * t;