diff --git a/src/main.rs b/src/main.rs
index b5dfd0d867e4b18b54744602dc4a10cd5109efde..aa3b757ce29bd73d75043a76b722f17027aec201 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,27 +3,23 @@ use image::{GenericImageView, ImageReader, Rgba};
 const TOAST_TIME_SECONDS: u64 = 10;
 const CENTER_X: f64 = 100.0;
 const CENTER_Y: f64 = 100.0;
-const BREAD_HEIGHT: f64 = 0.4;
-const IDLE_HEIGHT: f64 = BREAD_HEIGHT + 8.0;
-const PIXEL_SIZE_MM: f64 = 1.5;
+const BREAD_HEIGHT: f64 = 0.6;
+const IDLE_HEIGHT: f64 = BREAD_HEIGHT + 10.0;
+const PIXEL_SIZE_MM: f64 = 3.0;
 
 fn main() -> anyhow::Result<()> {
     let img = ImageReader::open("/home/stephen/Downloads/scd31-qr.png")?.decode()?;
 
     preamble();
 
-    // 2x oversampling
-    for x in 0..(img.width() * 2 - 1) {
-        for y in 0..(img.height() * 2 - 1) {
-            let black = is_black(img.get_pixel(x / 2, y / 2))
-                && is_black(img.get_pixel(x / 2 + x % 2, y / 2))
-                && is_black(img.get_pixel(x / 2, y / 2 + y % 2))
-                && is_black(img.get_pixel(x / 2 + x % 2, y / 2 + y % 2));
+    for x in 0..(img.width()) {
+        for y in 0..(img.height()) {
+            let black = is_black(img.get_pixel(x, y));
 
             if black {
                 toast(
-                    x as f64 - (img.width() as f64),
-                    (img.height() as f64) - y as f64, // correct for reflection when printing
+                    x as f64 - (img.width() as f64 / 2.0),
+                    (img.height() as f64 / 2.0) - y as f64, // correct for reflection when printing
                 );
             }
         }