diff --git a/src/compute b/src/compute
index 5e83a07b..5e68924f 160000
--- a/src/compute
+++ b/src/compute
@@ -1 +1 @@
-Subproject commit 5e83a07bae0c6fbe4e767be0b55f19fea49160b6
+Subproject commit 5e68924f121118a5ccb80820757a0ffcfadb283e
diff --git a/src/films/color.cpp b/src/films/color.cpp
index 7a98ad2b..07a95cb8 100644
--- a/src/films/color.cpp
+++ b/src/films/color.cpp
@@ -109,7 +109,8 @@ void ColorFilmInstance::_accumulate(Expr<uint2> pixel, Expr<float3> rgb, Expr<fl
     auto pixel_id = pixel.y * node()->resolution().x + pixel.x;
     $if(!any(isnan(rgb) || isinf(rgb))) {
         auto threshold = node<ColorFilm>()->clamp() * max(effective_spp, 1.f);
-        auto strength = max(max(max(rgb.x, rgb.y), rgb.z), 0.f);
+        auto abs_rgb = abs(rgb);
+        auto strength = max(max(max(abs_rgb.x, abs_rgb.y), abs_rgb.z), 0.f);
         auto c = rgb * (threshold / max(strength, threshold));
         $if(any(c != 0.f)) {
             _image->atomic(pixel_id).x.fetch_add(c.x);