diff --git a/src/pipe/modules/denoise/noop.comp b/src/pipe/modules/denoise/noop.comp
index fb236db1..a226df7c 100644
--- a/src/pipe/modules/denoise/noop.comp
+++ b/src/pipe/modules/denoise/noop.comp
@@ -46,7 +46,7 @@ main()
     vec2 pos = (0.5 + ipos + push.crop.xy) / textureSize(img_in, 0);
     pos = clamp((pos * push.map_os.zw) - push.map_os.xy, vec2(0.), vec2(1.));
     vec4 gains = texture(img_gainmap, pos);
-    float gain = gains[(ipos.x & 1) + (ipos.y & 1) * 2];
+    float gain = gains[(ipos.x & 1) + (1-(ipos.y & 1)) * 2]; // this permutation looks good on the samples i have. let's see how long it lasts.
     col *= gain;
   } // end gainmap
   imageStore(img_out, ipos, vec4(col, 1));