add cutoff grayscale

examples/live.rs

@@ -11,6 +11,8 @@ struct Args {
     temperature: bool,
     #[arg(short, long, default_value = "/dev/video0")]
     device: String,
+    #[arg(short, long)]
+    red_cutoff: Option<f64>,
 }
 
 fn pixel_to_celcius(x: u16) -> u16 {
@@ -96,6 +98,13 @@ fn main() -> anyhow::Result<()> {
                     let mut pixel = u16::from_be_bytes([frame[i * 2], frame[i * 2 + 1]]);
                     if args.temperature {
                         pixel = pixel_to_celcius(pixel);
+                        if let Some(cutoff) = args.red_cutoff {
+                            pixel = if pixel > (256.0 * cutoff) as u16 {
+                                50000
+                            } else {
+                                0
+                            }
+                        }
                     }
                     let pixel_swapped = pixel.to_le_bytes();
                     swapped[i * 2..i * 2 + 2].copy_from_slice(&pixel_swapped);