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old school exposure
Posted: Sat Dec 13, 2014 11:41 am
by abstrax
Hi all,
Since some people miss the old school exposure settings for reasons that are totally beyond me, I have whipped up a little Lua node graph that emulates the old exposure settings:
Just download the file and import it into your project (via RMB click in the node graph editor -> Import...) and connect it with the exposure pin of the camera imager node like:
Cheers,
Marcus
Re: old school exposure
Posted: Sat Dec 13, 2014 4:32 pm
by p3taoctane
Thanks
THough it may seem like you are creating a bit of code that is old school ... being older than school myself... I love it
Thanks
Peter
Re: old school exposure
Posted: Sun Dec 14, 2014 4:07 pm
by bepeg4d
Hi Marcus,
first of all, the lua node is fantastic, thanks for sharing this example

here is my simple version but i don't think is correct in terms of calculation:
could you have a look at it?
ciao beppe
Re: old school exposure
Posted: Mon Dec 15, 2014 9:02 pm
by roeland
The exposure on a camera is a logarithmic scale, +1 EV means double the exposure. The formula is
exposure * 2 ^ EV.
Check the times you typically find on a shutter speed dial:
- 1/1000
- 1/500
- 1/250
- 1/125
- 1/60
- 1/30
- 1/15
- 1/8
- 1/4
- 1/2
- 1
Every stop doubles the exposure.
--
Roeland
Re: old school exposure
Posted: Tue Dec 16, 2014 10:19 am
by bepeg4d
thanks roeland for the info

fortunately for my old brain, Marcus has create a
brilliant solution that solves my needs

ciao beppe
Re: old school exposure
Posted: Wed Jan 21, 2015 3:16 am
by Phil_RA
The reason it was useful to have the three settings is to match a photo's EXIF data. I'm trying to make sure the scene I'm working on is physically correct, so using the exif data and putting in the same values allows me to make sure that mights are of the correct intensity.