diff --git a/devices/elp-4k-usb-cam.dapss b/devices/elp-4k-usb-cam.dapss
index 41922bd..f2e02e0 100644
--- a/devices/elp-4k-usb-cam.dapss
+++ b/devices/elp-4k-usb-cam.dapss
@@ -5,7 +5,7 @@
  * Native capture up to 3840x2160 @ 30fps (MJPEG / YUYV via opt-planar).
  */
 
-+edev|elp-4k-usb-cam|colour-yuv-y()
++edev|elp-4k-usb-cam|negtrin()|postrin()|colour-yuv-y()
 	|lcameraBuff(
 		vres=720p
 		|colour-space=yuv|opt-planar)