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Always had the trouble to render interiors with a background image, since interiors require high ISO and the background gets "burned" and not looking good (the human eye compensates for this of course). So, I found that if I create a maxwell material with my image as layer 1 (ND 0) and add 1 or 2 layers of black color and also ND 0, I can preserve the background image and it doesn't get too white and even looks like the human eye gets it...

Really great tip Choo-Chee. Can you post an example of this. gadzooks

It looks interesting, but isn't it the same if you lower your background image brightness?

not really, when you lower the brightness in a photo-editing app. the image loses contrast. this way I can have low shutter speed as 50 with iso 600 and still get "normal" background....

ok thanks for explaining ! It is interesting to aim an "human eye" look, if you can show renders using this technique it would be great !

I'll render this weekend some stuff

thank you for sharing this with us Choo - very interesting discovery

choo-chee wrote:not really, when you lower the brightness in a photo-editing app. the image loses contrast. this way I can have low shutter speed as 50 with iso 600 and still get "normal" background....

I'm 99% sure there is a way to do this correctly in photoshop so you don't lose contrast.....having said that, if this works for you and it doesn't affect render times, do what works!

could you post example render?

usually those settings with direct physical sun like here would mean white exterior and lot of post. I'll do post to this image but it will need no alpha mask etc.

hmm looks nice !! thanks for posting the result !

Yup, that would normally be blow out. Tight!

In the movie industry sometimes the DP puts gray tinted film on the windows for this reason.