diff --git a/src/blur/blur.ts b/src/blur/blur.ts
index 8446457..74a4d51 100644
--- a/src/blur/blur.ts
+++ b/src/blur/blur.ts
@@ -12,7 +12,8 @@ import {
 	floor,
 	max,
 	convertToTexture,
-	exp
+	exp,
+	select
 } from "three/tsl";
 import type { Node, TextureNode } from "three/webgpu";
 
@@ -79,8 +80,10 @@ function createGaussianBlurPass(
 				condition: "<="
 			},
 			({ i }) => {
-				const weight = exp(
-					float(i).mul(float(i)).negate().div(twoSigmaSq)
+				const weight = select(
+					twoSigmaSq.equal(0),
+					float(0.00001),
+					exp(float(i).mul(float(i)).negate().div(twoSigmaSq))
 				);
 				totalWeight.addAssign(weight);
 				const offset = vec2(
diff --git a/src/color/colorLookup.ts b/src/color/colorLookup.ts
index ce8fb1e..cfdb456 100644
--- a/src/color/colorLookup.ts
+++ b/src/color/colorLookup.ts
@@ -120,10 +120,20 @@ export function gradient(
 				const lowChromaThreshold = 0.001;
 				const adjustedH1 = oklch1.y
 					.lessThan(lowChromaThreshold)
-					.select(oklch2.z, oklch1.z);
+					.select(
+						oklch2.y
+							.greaterThanEqual(lowChromaThreshold)
+							.select(oklch2.z, float(0)),
+						oklch1.z
+					);
 				const adjustedH2 = oklch2.y
 					.lessThan(lowChromaThreshold)
-					.select(oklch1.z, oklch2.z);
+					.select(
+						oklch1.y
+							.greaterThanEqual(lowChromaThreshold)
+							.select(oklch1.z, float(0)),
+						oklch2.z
+					);
 
 				// Interpolate in OKLCH space
 				const l = mix(oklch1.x, oklch2.x, localT);