diff --git a/src/bin/minedmap/common.rs b/src/bin/minedmap/common.rs
index eda782d..764fe4c 100644
--- a/src/bin/minedmap/common.rs
+++ b/src/bin/minedmap/common.rs
@@ -21,6 +21,10 @@ pub struct Config {
 	pub map_dir: PathBuf,
 }
 
+fn coord_filename(coords: RegionCoords, ext: &str) -> String {
+	format!("r.{}.{}.{}", coords.0, coords.1, ext)
+}
+
 impl Config {
 	pub fn new(args: super::Args) -> Self {
 		let region_dir = [&args.input_dir, Path::new("region")].iter().collect();
@@ -36,33 +40,18 @@ impl Config {
 		}
 	}
 
-	pub fn processed_path(&self, coords: RegionCoords, temp: bool) -> PathBuf {
-		let filename = format!(
-			"r.{}.{}.bin{}",
-			coords.0,
-			coords.1,
-			if temp { ".tmp" } else { "" },
-		);
+	pub fn processed_path(&self, coords: RegionCoords) -> PathBuf {
+		let filename = coord_filename(coords, "bin");
 		[&self.processed_dir, Path::new(&filename)].iter().collect()
 	}
 
-	pub fn light_path(&self, coords: RegionCoords, temp: bool) -> PathBuf {
-		let filename = format!(
-			"r.{}.{}.png{}",
-			coords.0,
-			coords.1,
-			if temp { ".tmp" } else { "" },
-		);
+	pub fn light_path(&self, coords: RegionCoords) -> PathBuf {
+		let filename = coord_filename(coords, "png");
 		[&self.light_dir, Path::new(&filename)].iter().collect()
 	}
 
-	pub fn map_path(&self, coords: RegionCoords, temp: bool) -> PathBuf {
-		let filename = format!(
-			"r.{}.{}.png{}",
-			coords.0,
-			coords.1,
-			if temp { ".tmp" } else { "" },
-		);
+	pub fn map_path(&self, coords: RegionCoords) -> PathBuf {
+		let filename = coord_filename(coords, "png");
 		[&self.map_dir, Path::new(&filename)].iter().collect()
 	}
 }
diff --git a/src/bin/minedmap/region_processor.rs b/src/bin/minedmap/region_processor.rs
index d81994f..03229be 100644
--- a/src/bin/minedmap/region_processor.rs
+++ b/src/bin/minedmap/region_processor.rs
@@ -1,9 +1,9 @@
-use std::{fs, path::Path};
+use std::path::Path;
 
 use anyhow::{Context, Result};
 
 use minedmap::{
-	io::storage,
+	io::{fs, storage},
 	resource,
 	types::*,
 	world::{
@@ -63,26 +63,16 @@ impl<'a> RegionProcessor<'a> {
 	}
 
 	fn save_region(&self, coords: RegionCoords, processed_region: &ProcessedRegion) -> Result<()> {
-		let output_path = self.config.processed_path(coords, false);
+		let output_path = self.config.processed_path(coords);
 		storage::write(&output_path, processed_region)
 	}
 
 	fn save_lightmap(&self, coords: RegionCoords, lightmap: &image::GrayAlphaImage) -> Result<()> {
-		let tmp_path = self.config.light_path(coords, true);
-		lightmap
-			.save_with_format(&tmp_path, image::ImageFormat::Png)
-			.context("Failed to save image")?;
-
-		let output_path = self.config.light_path(coords, false);
-		fs::rename(&tmp_path, &output_path).with_context(|| {
-			format!(
-				"Failed to rename {} to {}",
-				tmp_path.display(),
-				output_path.display(),
-			)
-		})?;
-
-		Ok(())
+		fs::create_with_tmpfile(&self.config.light_path(coords), |file| {
+			lightmap
+				.write_to(file, image::ImageFormat::Png)
+				.context("Failed to save image")
+		})
 	}
 
 	/// Processes a single region file
@@ -132,18 +122,8 @@ impl<'a> RegionProcessor<'a> {
 			)
 		})?;
 
-		fs::create_dir_all(&self.config.processed_dir).with_context(|| {
-			format!(
-				"Failed to create directory {}",
-				self.config.processed_dir.display(),
-			)
-		})?;
-		fs::create_dir_all(&self.config.light_dir).with_context(|| {
-			format!(
-				"Failed to create directory {}",
-				self.config.light_dir.display(),
-			)
-		})?;
+		fs::create_dir_all(&self.config.processed_dir)?;
+		fs::create_dir_all(&self.config.light_dir)?;
 
 		let mut ret = Vec::new();
 
diff --git a/src/bin/minedmap/tile_renderer.rs b/src/bin/minedmap/tile_renderer.rs
index 3ae51c6..b4f4a3a 100644
--- a/src/bin/minedmap/tile_renderer.rs
+++ b/src/bin/minedmap/tile_renderer.rs
@@ -1,8 +1,10 @@
-use std::fs;
-
 use anyhow::{Context, Result};
 
-use minedmap::{io::storage, resource::block_color, types::*};
+use minedmap::{
+	io::{fs, storage},
+	resource::block_color,
+	types::*,
+};
 
 use super::common::*;
 
@@ -16,7 +18,7 @@ impl<'a> TileRenderer<'a> {
 	}
 
 	fn load_region(&self, coords: RegionCoords) -> Result<ProcessedRegion> {
-		let processed_path = self.config.processed_path(coords, false);
+		let processed_path = self.config.processed_path(coords);
 		storage::read(&processed_path).context("Failed to load processed region data")
 	}
 
@@ -57,8 +59,8 @@ impl<'a> TileRenderer<'a> {
 	fn render_tile(&self, coords: RegionCoords) -> Result<()> {
 		const N: u32 = (BLOCKS_PER_CHUNK * CHUNKS_PER_REGION) as u32;
 
-		let tmp_path = self.config.map_path(coords, true);
-		let output_path = self.config.map_path(coords, false);
+		let output_path = self.config.map_path(coords);
+
 		println!(
 			"Rendering tile {}",
 			output_path
@@ -70,27 +72,16 @@ impl<'a> TileRenderer<'a> {
 		let region = self.load_region(coords)?;
 		let mut image = image::RgbaImage::new(N, N);
 		Self::render_region(&mut image, &region);
-		image
-			.save_with_format(&tmp_path, image::ImageFormat::Png)
-			.context("Failed to save image")?;
-		fs::rename(&tmp_path, &output_path).with_context(|| {
-			format!(
-				"Failed to rename {} to {}",
-				tmp_path.display(),
-				output_path.display(),
-			)
-		})?;
 
-		Ok(())
+		fs::create_with_tmpfile(&output_path, |file| {
+			image
+				.write_to(file, image::ImageFormat::Png)
+				.context("Failed to save image")
+		})
 	}
 
 	pub fn run(self, regions: &[RegionCoords]) -> Result<()> {
-		fs::create_dir_all(&self.config.map_dir).with_context(|| {
-			format!(
-				"Failed to create directory {}",
-				self.config.map_dir.display(),
-			)
-		})?;
+		fs::create_dir_all(&self.config.map_dir)?;
 
 		for &coords in regions {
 			if let Err(err) = self.render_tile(coords) {