From 96d1af5b78811c623d184fa97f1d6b0f12382550 Mon Sep 17 00:00:00 2001
From: Camden Dixie O'Brien <cdo@wip.sh>
Date: Mon, 26 Oct 2026 15:05:11 +0000
Subject: [PATCH] Create greyscale example

---
 examples/{convolution.rs => greyscale.rs} | 28 ++++++++++-------------
 1 file changed, 12 insertions(+), 16 deletions(-)
 rename examples/{convolution.rs => greyscale.rs} (51%)

diff --git a/examples/convolution.rs b/examples/greyscale.rs
similarity index 51%
rename from examples/convolution.rs
rename to examples/greyscale.rs
index fb34f2d..8bc1eb9 100644
--- a/examples/convolution.rs
+++ b/examples/greyscale.rs
@@ -1,10 +1,14 @@
-use ccvl::{image::*, kernel::*};
+use ccvl::image::*;
+
+fn filter(img: Image<SRGBA>) -> Image<SRGBA> {
+    img.map(|p| Luminance::from(p).into())
+}
 
 fn main() -> std::process::ExitCode {
     let args = std::env::args().collect::<Vec<String>>();
     if args.len() != 3 {
         println!("Usage: {} IN OUT", args[0].as_str());
-		return std::process::ExitCode::FAILURE;
+        return std::process::ExitCode::FAILURE;
     }
 
     let input_path = args[1].as_str();
@@ -19,20 +23,12 @@ fn main() -> std::process::ExitCode {
             println!("I/O error loading image {}: {}", input_path, err);
             std::process::ExitCode::FAILURE
         }
-        Ok(img) => {
-            let kernel =
-                [[1.0, 1.0, 1.0], [1.0, 1.0, 1.0], [1.0, 1.0, 1.0]];
-            let result = kernel.convolve(&img);
-            match result.save::<Farbfeld>(output_path) {
-                Err(err) => {
-                    println!(
-                        "I/O error saving image {}: {}",
-                        output_path, err
-                    );
-					std::process::ExitCode::FAILURE
-                }
-                Ok(()) => std::process::ExitCode::SUCCESS,
+        Ok(img) => match filter(img).save::<Farbfeld>(output_path) {
+            Err(err) => {
+                println!("I/O error saving image {}: {}", output_path, err);
+                std::process::ExitCode::FAILURE
             }
-        }
+            Ok(()) => std::process::ExitCode::SUCCESS,
+        },
     }
 }