diff --git a/src/main.rs b/src/main.rs
index 4b7ad15..ef37067 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -146,9 +146,9 @@ fn main() {
 
     // Image
     let aspect_ratio = 16.0 / 9.0;
-    let image_width = 400;
+    let image_width = 1920;
     let image_height = (image_width as f64 / aspect_ratio) as u32;
-    let samples_per_pixel = 100_u32;
+    let samples_per_pixel = 200_u32;
     let max_depth = 50;
 
     let vfov = 25.0;
@@ -182,7 +182,8 @@ fn main() {
 
     let atomic_counter = Arc::new(AtomicU32::new(0));
     let color_lines: Vec<_> = (0..image_height)
-        .into_par_iter()
+        .into_par_iter()  // threadded/parallel variant
+        //.into_iter()  // iterative variant
         .rev()
         .map(|j| {
             let v = atomic_counter.fetch_add(1, Ordering::Relaxed);