At the moment, LuxRender defaults to the Reinhard tonemapper and sets the LDR clamp mode to "lum". Ostensibly, this is to mimic an auto-exposure camera, except the auto-linear+"cut" combo actually behaves much more like an auto-exposure camera than Reinhard does. Reinhard is a bit more complex than that and often confuses new users with its behavior. We even have an entry in the FAQ for users who are surprised by how it reacts to changes in relative light brightness. And the behavior of the "lum" clamp mode is just plain weird, IMO.
I've been using auto-linear+cut as my defaults for awhile now (by setting them in my startup.blend file for lb25) and am beginning to wonder if it would be best to change the actual defaults used in the core and what the exporters set. So, I'd like to get people thoughts on two things:
1. Changing the default tonemapping kernel in the core and exporters to auto-linear instead of Reinhard.
2. Changing the default LDR clamp mode, again for both the core and exporters, to cut (clip individually) instead of lum (preserve luminosity)
Material DB Admin