Switch Image to Color channel for BG objects.

` brasco [2:55 PM] @dskeith: OK, firstly Import Image rocks, got lots of useful tools there I can use often, secondly... This is a niche one, Octane uses C4D's background / foreground object to create backgrounds and it actually utilises C4D's materials to do this, however it has to have the image in the Color Channel not Luminance

[2:55] Would it be a problem to set it to the Color Channel since shading is ignored on BG and FG objects?`