2 files changed, 7 insertions, 0 deletions
diff --git a/flake.nix b/flake.nix
index c29f113..4e5d1b6 100644
--- a/flake.nix
+++ b/flake.nix
@@ -145,6 +145,7 @@
             geckodriver
             pkg-config
             openssl
+            imagemagick
           ];
         };
       });
diff --git a/src/main.rs b/src/main.rs
index 230da83..b3635ee 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -43,6 +43,12 @@ async fn main() -> Result<(), Box<dyn Error>> {
         let output_path = Path::new(&args.path);
         let tmp_path = output_path.with_extension("png.tmp");
         fs::write(&tmp_path, img)?;
+
+        Command::new("mogrify")
+            .arg("-colorspace")
+            .arg("gray")
+            .arg(tmp_path.as_os_str())
+            .spawn()?.wait()?;
         fs::rename(&tmp_path, output_path)?;
         time::sleep(Duration::from_secs(15)).await;
         info!("Wrote {}", output_path.display());