diff --git a/esp32_firmware/esp32_cam_uart_stream/esp32_cam_uart_stream.ino b/esp32_firmware/esp32_cam_uart_stream/esp32_cam_uart_stream.ino
index 1758b62..48c4ec3 100644
--- a/esp32_firmware/esp32_cam_uart_stream/esp32_cam_uart_stream.ino
+++ b/esp32_firmware/esp32_cam_uart_stream/esp32_cam_uart_stream.ino
@@ -156,14 +156,8 @@ void loop() {
   delay(50);
 }
 
-bool IsDarkBit(uint8_t bit){
-  bool result = bit < 128;
-
-  if (invert){
-    result = !result;
-  }
-
-  return result;
+inline bool IsDarkBit(const uint8_t bit) {
+  return (invert ^ (bit < 128));
 }
 
 void DitherImage(camera_fb_t* fb) {
@@ -180,4 +174,4 @@ void DitherImage(camera_fb_t* fb) {
         fb->buf[(y+1*fb->width) + x+1] = fb->buf[(y+1*fb->width) + x+1] + quant_error * 1 / 16;
       }
     }  
-}
\ No newline at end of file
+}