diff --git a/src/Orange/Render/Shaders/fs_HDRTest.frag b/src/Orange/Render/Shaders/fs_HDRTest.frag
index 3bd11dc..75aea0c 100644
--- a/src/Orange/Render/Shaders/fs_HDRTest.frag
+++ b/src/Orange/Render/Shaders/fs_HDRTest.frag
@@ -401,6 +401,14 @@ void main()
         outColor = vec4(nitsToPq(color), 1.0);
     }
     else if (test == nextTest++)
+    {
+        vec3 color = vec3(targetNits, 0.0f, targetNits);
+        if (((int(gl_FragCoord.x) & 1) == 0) == ((int(gl_FragCoord.y) & 1) == 0))
+            color = vec3(0.0f, targetNits, 0.0f);
+
+        outColor = vec4(nitsToPq(color), 1.0);
+    }
+    else if (test == nextTest++)
     {
         const vec3 barycentrics = vec3(1.0 - coords.x - coords.y, coords.x, coords.y) * targetNits;