Over/Under Exposure Clipping Warning (Patreon)

Hey guys! Here is a nice bit of advice I mentioned to someone in the Redshift forums. Some of you guys might be coming from a photography/cinematography background and are wondering how to tell if you render exposure is over/under clipping the Black/White values. There are two ways of knowing, one is by using the Histogram in the Color Controls and another is by using a specialized LUT.

Redshift actually ships with one under the Filmic LUTs section called “False Colour”

Its located in the Data folder where your Redshift Install is. For example

C:\ProgramData\Redshift\Data\LUT\FilmicLUTs

False Colour. This LUT is an extremely useful tool for evaluating your image in terms of the dynamic range and latitude. It is a color coded “heat map” of your image values, according to the following codes:

Value Colour Scene Referred Value
Low Clip Black Scene Referred Linear value below 0.0001762728758.
-10 EV Purple Scene Referred Linear value 0.0001762728758.
-7 EV Blue Scene Referred Linear value 0.001404109349.
-4 EV Cyan Scene Linear value 0.01124714399.
-2 EV Green Scene Referred Linear value 0.04456791864.
0 EV Grey Scene Referred Linear value 0.18009142.
+2 EV Green Scene Referred Linear value 0.7196344767.
+4 EV Yellow Scene Referred Linear value 2.883658483.
+5.5 EV Red Scene Referred Linear value 8.150007644.
High Clip White Scene Referred Linear value above 16.29174024.

Using this you can tell if your render is clipping too much data in your black shadows and white specular. It is an easy to visualize representation to balance the exposure of your shot like you would a digital camera. Hope some of you find this info useful, thanks again for the support and enjoy!