Input sequence: take pictures (at 30 f/s) on a static color chart under a variable single light source.
Output plot: pick a pixel on each color square, and plot its color proportion and brightness along time. 6 plots below correspond respectively to 6 squares in the chart.
Legend: The color lines represent color proportions and the black line represents a re-scaled brightness, i.e., [ 0, 3 *255 ] -> [ 0, 1].
Remark
Bright colors have more variable color proportions than dark ones.
In some bright colors like 'white', there is a clipping on brightness.
It would be good to see the plots of the weighted color deviations from the nearest codeword.
