diff --git a/src/main.rs b/src/main.rs
index 274928c..d389105 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -44,13 +44,13 @@ fn main() {
                 Ok(data) => {
                     let start = Instant::now();
                     let img = image::load_from_memory(&data).unwrap();
-                    let rgb_data = img.to_rgb8();
+                    let rgb_data = img.to_luma8();
                     if w == 0 {
                         w = rgb_data.width() as i32;
                         h = rgb_data.height() as i32;
                     }
                     let fltk_image =
-                        RgbImage::new(&rgb_data.as_raw(), w, h, ColorDepth::Rgb8).unwrap();
+                        RgbImage::new(&rgb_data.as_raw(), w, h, ColorDepth::L8).unwrap();
                     frame.set_image(Some(fltk_image));
                     frame.redraw();
                     let duration = start.elapsed();