diff --git a/pkg/tsdb/grafana-testdata-datasource/sims/grot3d.go b/pkg/tsdb/grafana-testdata-datasource/sims/grot3d.go
index 6865a9970c7..d29da9b372a 100644
--- a/pkg/tsdb/grafana-testdata-datasource/sims/grot3d.go
+++ b/pkg/tsdb/grafana-testdata-datasource/sims/grot3d.go
@@ -435,10 +435,10 @@ func (s *grot3dSim) generateSVG() string {
 		g := int(float64(c.G) * intensity)
 		b := int(float64(c.B) * intensity)
 
-		// Quantize colors to reduce palette (round to nearest 16)
-		r = (r / 16) * 16
-		g = (g / 16) * 16
-		b = (b / 16) * 16
+		// Quantize colors to reduce palette (round to nearest 8)
+		r = (r / 8) * 8
+		g = (g / 8) * 8
+		b = (b / 8) * 8
 
 		colorStr := fmt.Sprintf("#%02x%02x%02x", r, g, b)