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web-app/node_modules/three/examples/jsm/tsl/display/Sepia.js

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+import { dot, Fn, vec3, vec4 } from 'three/tsl';
+
+export const sepia = /*@__PURE__*/ Fn( ( [ color ] ) => {
+
+	const c = vec3( color );
+
+	// https://github.com/evanw/glfx.js/blob/master/src/filters/adjust/sepia.js
+
+	return vec4(
+		dot( c, vec3( 0.393, 0.769, 0.189 ) ),
+		dot( c, vec3( 0.349, 0.686, 0.168 ) ),
+		dot( c, vec3( 0.272, 0.534, 0.131 ) ),
+		color.a
+	);
+
+} );