diff --git a/src/buffer/buffer.ts b/src/buffer/buffer.ts
index 4ea54c98..4bf8d0b3 100755
--- a/src/buffer/buffer.ts
+++ b/src/buffer/buffer.ts
@@ -181,13 +181,13 @@ class Buffer {
         emissive: { value: new Color(0x000000) },
         roughness: { value: this.parameters.roughness },
         metalness: { value: this.parameters.metalness },
-        interiorColor: { value: new Color(this.parameters.interiorColor) },
+        interiorColor: { value: new Color(this.parameters.interiorColor).convertSRGBToLinear() },
         interiorDarkening: { value: this.parameters.interiorDarkening },
       },
       UniformsLib.lights
     ])
 
-    this.uniforms.diffuse.value.set(this.parameters.diffuse)
+    this.uniforms.diffuse.value.set(new Color(this.parameters.diffuse).convertSRGBToLinear())
 
     this.pickingUniforms = {
       clipNear: { value: 0.0 },
diff --git a/src/color/colormaker.ts b/src/color/colormaker.ts
index 0f2302af..6f8b69fb 100644
--- a/src/color/colormaker.ts
+++ b/src/color/colormaker.ts
@@ -51,7 +51,7 @@ const tmpColor = new Color()
  * @param c normalized ([0-1]) component vale
  * @returns linearized value
  */
-function SRGBToLinear( c: number ) {
+export function SRGBToLinear( c: number ) {
   return ( c < 0.04045 ) ? c * 0.0773993808 : Math.pow( c * 0.9478672986 + 0.0521327014, 2.4 );
 }
 
diff --git a/src/viewer/viewer.ts b/src/viewer/viewer.ts
index 9017c63f..330f3eb7 100644
--- a/src/viewer/viewer.ts
+++ b/src/viewer/viewer.ts
@@ -316,9 +316,9 @@ export default class Viewer {
       clipMode: 'scene',
       clipScale: 'relative',
 
-      lightColor: new Color(0xdddddd),
+      lightColor: new Color(0xdddddd).convertSRGBToLinear(),
       lightIntensity: 3.14,
-      ambientColor: new Color(0xdddddd),
+      ambientColor: new Color(0xdddddd).convertSRGBToLinear(),
       ambientIntensity: 0.63,
 
       sampleLevel: 0,