3.29 Perception/decoding: Visual tasks and channels/mappings

• Please go through the different channels in Fig. 1.24 and 1.25.
  • Why is color (luminance/saturation) ranked so low in Figure 1.24?
  • Why is volume (3d as size) ranked so low in Figure 1.24?
  • Can you explain the ranking in Fig. 1.25?