diff --git a/src/bin/minedmap/tile_renderer.rs b/src/bin/minedmap/tile_renderer.rs
index fcd3e85..64c9d55 100644
--- a/src/bin/minedmap/tile_renderer.rs
+++ b/src/bin/minedmap/tile_renderer.rs
@@ -2,23 +2,10 @@ use std::fs;
 
 use anyhow::{Context, Result};
 
-use minedmap::{io::storage, resource::Biome, types::*, world};
+use minedmap::{io::storage, resource::block_color, types::*, world};
 
 use super::common::*;
 
-fn block_color(block: &world::layer::BlockInfo, _biome: &Biome) -> [u8; 4] {
-	let h = block
-		.depth
-		.map(|depth| 0.5 + 0.005 * depth.0 as f32)
-		.unwrap_or_default();
-	let c = block
-		.block_type
-		.color
-		.0
-		.map(|v| (f32::from(v) * h).clamp(0.0, 255.0) as u8);
-	[c[0], c[1], c[2], 255]
-}
-
 pub struct TileRenderer<'a> {
 	config: &'a Config,
 }
@@ -47,7 +34,14 @@ impl<'a> TileRenderer<'a> {
 				z: BlockZ(z as u8),
 			};
 			image::Rgba(match (&blocks[coords], &biomes[coords]) {
-				(Some(block), Some(biome)) => block_color(block, biome),
+				(
+					Some(world::layer::BlockInfo {
+						block_type,
+						depth: Some(depth),
+						..
+					}),
+					Some(biome),
+				) => block_color(*block_type, biome, depth.0 as f32),
 				_ => [0, 0, 0, 0],
 			})
 		});
diff --git a/src/resource/block_color.rs b/src/resource/block_color.rs
new file mode 100644
index 0000000..31434de
--- /dev/null
+++ b/src/resource/block_color.rs
@@ -0,0 +1,10 @@
+use super::{Biome, BlockType};
+
+pub fn block_color(block: BlockType, _biome: &Biome, depth: f32) -> [u8; 4] {
+	let h = 0.5 + 0.005 * depth;
+	let c = block
+		.color
+		.0
+		.map(|v| (f32::from(v) * h).clamp(0.0, 255.0) as u8);
+	[c[0], c[1], c[2], 255]
+}
diff --git a/src/resource/mod.rs b/src/resource/mod.rs
index 62c5d9c..a1abaf8 100644
--- a/src/resource/mod.rs
+++ b/src/resource/mod.rs
@@ -1,4 +1,5 @@
 mod biomes;
+mod block_color;
 mod block_types;
 mod legacy_block_types;
 
@@ -90,6 +91,7 @@ impl BlockTypes {
 }
 
 pub use biomes::Biome;
+pub use block_color::block_color;
 
 #[derive(Debug)]
 pub struct BiomeTypes {