diff --git a/rtiow/src/bin/tracer.rs b/rtiow/src/bin/tracer.rs
index b745dcf..f9f1ec8 100644
--- a/rtiow/src/bin/tracer.rs
+++ b/rtiow/src/bin/tracer.rs
@@ -32,7 +32,7 @@ fn main() -> Result<(), std::io::Error> {
             .start(pprof_path.to_str().unwrap().as_bytes())
             .unwrap();
     }
-    let res = render(scene, &opt.output);
+    let res = render(scene, &opt.output, opt.store_intermediate);
     if let Some(pprof_path) = opt.pprof {
         info!("Saving pprof to {}", pprof_path.to_string_lossy());
         PROFILER.lock().unwrap().stop().unwrap();
diff --git a/rtiow/src/renderer.rs b/rtiow/src/renderer.rs
index f2de053..c603b92 100644
--- a/rtiow/src/renderer.rs
+++ b/rtiow/src/renderer.rs
@@ -1,5 +1,7 @@
 use std;
 use std::fmt;
+use std::io;
+use std::io::Write;
 use std::path::Path;
 use std::path::PathBuf;
 use std::str;
@@ -97,6 +99,9 @@ pub struct Opt {
     /// Use acceleration data structure, may be BVH or kd-tree depending on scene.
     #[structopt(long = "use_accel")]
     pub use_accel: bool,
+    /// Store intermediate images when -s > 1
+    #[structopt(long = "store_intermediate")]
+    pub store_intermediate: bool,
 
     /// Output directory
     #[structopt(parse(from_os_str), default_value = "/tmp/tracer")]
@@ -165,10 +170,14 @@ fn render_worker(
         }
         output_chan.send((subsample, pixel_data));
     }
-    info!("Shutting down worker {}", tid);
+    trace!(target: "renderer", "Shutting down worker {}", tid);
 }
 
-pub fn render(scene: Scene, output_dir: &Path) -> std::result::Result<(), std::io::Error> {
+pub fn render(
+    scene: Scene,
+    output_dir: &Path,
+    store_intermediate: bool,
+) -> std::result::Result<(), std::io::Error> {
     let (seq_tx, seq_rx) = channel::unbounded();
     let (pixel_data_tx, pixel_data_rx) = channel::unbounded();
 
@@ -193,8 +202,9 @@ pub fn render(scene: Scene, output_dir: &Path) -> std::result::Result<(), std::i
         acc.push(Default::default());
     }
 
+    println!("Rendering with {} subsamples", scene.subsamples);
     let mut img = RgbImage::new(scene.width as u32, scene.height as u32);
-    for (_subsample, pixel_data) in pixel_data_rx {
+    for (subsample, pixel_data) in pixel_data_rx {
         acc_count += 1;
         pixel_data.iter().enumerate().for_each(|(idx, p)| {
             let x = idx % scene.width;
@@ -216,10 +226,18 @@ pub fn render(scene: Scene, output_dir: &Path) -> std::result::Result<(), std::i
                 ]),
             );
         });
-        let path = output_dir.join(format!("iteration{:05}.png", acc_count));
-        trace!(target: "renderer", "Saving {}", path.to_string_lossy());
-        img.save(&path)
-            .unwrap_or_else(|_| panic!("Failed save {}", path.to_string_lossy()));
+        if subsample % 10 == 0 {
+            print!("{}", subsample);
+        } else {
+            print!(".");
+        }
+        io::stdout().flush().unwrap();
+        if store_intermediate {
+            let path = output_dir.join(format!("iteration{:05}.png", acc_count));
+            trace!(target: "renderer", "Saving {}", path.to_string_lossy());
+            img.save(&path)
+                .unwrap_or_else(|_| panic!("Failed save {}", path.to_string_lossy()));
+        }
     }
     let path = output_dir.join("final.png");
     // Write the contents of this image to the Writer in PNG format.