Fig. 4. Comparison of ΔE, ΔL*, Δa*, and Δb* between HD and SD images. (A) ΔE (mean±standard deviation) was 10.3±4.9 in HD images and 5.9±3.1 in SD images. The difference was statistically significant (P=0.011). (B) ΔL* was significantly higher in HD images than in SD images (5.9±3.6 vs. 3.3±2.2, P=0.025). There was no significant difference between Δa* (5.9±3.5 vs. 4.1±2.0, P=0.135) and Δb* (4.1±2.4 vs. 2.3±1.4, P=0.051).
HD = high-definition; SD = standard-definition.