I got the answer from Graphisoft.
In the PhotoRendering Settings Dialog, CineRender is selected for Engine.
The Detailed Settings\Effects\White Model checkbox is checked.
Under Detailed Settings\Environment\Physical Sky\Sun, the
Saturation Correction value was set to 150 to achieve the Sepia effect found in the predefined Scene.
In case of the White Model, this value is 25.
What I found is that using the Saturation Correction and particularly the
HUE Correction fields, almost any color can be achieved.
These basically change the Saturation and Color hue values of the Sun.
The HUE Correction field is what lets you achieve any color.
In the attached image I set HUE Correction to 40 to achieve a bluish color.
Or you can check the
Use Custom Colors checkbox and set the desired color in the
Sun Color field.
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