r_ColorGradingChartImage

If called with a parameter it loads a color chart image. This image will overwrite
 the dynamic color chart blending result and be used during post processing instead.
If called with no parameter it displays the name of the previously loaded chart.
To reset a previously loaded chart call r_ColorGradingChartImage 0.
Usage: r_ColorGradingChartImage [path of color chart image/reset]