Figure 4

The images from Figure 3 presented in 3D plot of Lab space: x - a, y - b, z - L. The 3 images acquired with lower WB setting than light temperature are marked with dark blue colour, 3 images with higher WB setting with yellow colour and 3 images with balanced WB with red colour. Global lightness of image is highest for images acquired with adjusted light and camera settings while for other groups lightness is lower. The lines connect the original and corrected image. Corrected images have their lightness increased even over the level of reference image, as orange and light blue point are higher than their yellow and blue uncorrected counterpart.