diff --git a/shaders/waveform-overlay/shader.slang b/shaders/waveform-overlay/shader.slang
index f2f2d88..d6eff81 100644
--- a/shaders/waveform-overlay/shader.slang
+++ b/shaders/waveform-overlay/shader.slang
@@ -71,7 +71,7 @@ float4 shadeVideo(ShaderContext context)
 
 		float sourceY = (samplePosition + 0.5) / requestedSamples;
 		float luma = dot(sampleVideo(float2(innerUv.x, sourceY)).rgb, float3(0.2126, 0.7152, 0.0722));
-		float targetY = 1.0 - saturate(luma);
+		float targetY = saturate(luma);
 		float sampleHit = 1.0 - smoothstep(pixelThickness, pixelThickness * 2.5, abs(innerUv.y - targetY));
 
 		density += sampleHit;