perf(segmentation): make segmentation read 3x faster (#3577)

extensions/cornerstone-dicom-seg/src/utils/dicomlabToRGB.ts

@@ -0,0 +1,16 @@
+import dcmjs from 'dcmjs';
+
+/**
+ * Converts a CIELAB color to an RGB color using the dcmjs library.
+ * @param cielab - The CIELAB color to convert.
+ * @returns The RGB color as an array of three integers between 0 and 255.
+ */
+function dicomlabToRGB(cielab: number[]): number[] {
+  const rgb = dcmjs.data.Colors.dicomlab2RGB(cielab).map(x =>
+    Math.round(x * 255)
+  );
+
+  return rgb;
+}
+
+export { dicomlabToRGB };