Ever have mental ray sun and sky renders look a little washed out? You need to manage your color workflow. Here, Jon Tojek provides a great look at creating a linear color management workflow in Maya when using mental ray, showing how to correct the gamma for mental ray’s physical sky, and verify that the textures in your scene are actually being color corrected to the linear space.
This video tutorial shows how to use Maya 2012 and Mental Ray rendering with mia_physicalsun as the lighting source
Jon makes note that starting with relevant scale is important when working with a physical renderer like mental ray, and shows how to disable the lens shader gamma, and turn on Maya’s Color Management Tools which will correct the textures and display the renders with gamma correction, and also shows by extension, rendering out 32 bit EXR files that will be used for linear compositing in Nuke.