Often when I'm using HDRI images, I want to get nice modulated lighting but I don't want to tint everything in the scene with the colors of the image. A while back someone in one of these forums said it perfectly: just because the sky is blue doesn't mean we all look like Smurfs. The Carrara content CD comes with somem greyscale HDRI images, but every free image I find online is in color. Is there a simple way to obtain or make greyscale HDRI images? If I need a separate utility I would prefer something that works on a Mac, although I do have Virtual PC. Ideally, though, I wish I could just click a checkbox in Carrara to tell it to ignore the colors in the HDRI image. A plugin perhaps?