Well, I read that part about Mac and PC monitors. But if you read on further it says that gamma is used in the GI calculation. It is on page 838 of the manual. I just tried to render with gamma and without. I took that image and did a gamma adjust in Irfan View. It is not the same. The manual says on that page that the gamma correction is taken into account for calculating GI with regard to textures. Either way, I dont like having to post gamma every image, I just let Carrara do it. Maybe someone can get Charles to explain better just what the gamma does with regard to GI.