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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

How to correct wrong ISO?

If you exposed your image for ISO 5000, the sensor never actually received enough light, so the image is mostly digitally pushed to be brighter.

I think denoising is your best bet. You can lower the ISO in post, but you'll likely just have an underexposed image if the image was originally exposed "for" ISO 5000. If you shot 6K and are finishing at a 2K downscale, you might get away with it.
 
Lewis-M Soucy said:
Well then I get a very underexposed footage...
Click to expand...


Yup. As Akin has mentioned, you were using a higher ISO to set your exposure. ISO is only meta data that you can change after, but you can't change the physics of how much light was hitting your sensor. It's like your monitor setting being on full brightness, so you reduce your exposure by changing your aperture therefore cutting the light to your sensor. Best you can do is use NEAT IMAGE or something to clean it up.
 
How badly underexposed is the footage at 2000iso? A stop and change? You might be able to get away with something, and as others have mentioned, dip into some NeatVideo on the back end as needed. Good luck...
 
changing the ISO is not physically doing anything its just changing the way you are exposing the RAW file. Ultimately you severaly limited what you can extract from the RAW, so there is no magic solution to fix that unfortunatley. Try Neat video as others have suggested.
 
I just finished a project where part of it was (unfortunately) shot on 6K Epic at 6400 ISO, and it was no fun to deal with in post. I did multiple passes of Resolve TNR and a little bit of DNR, and the client was extremely pleased with the results. And this was all from the Raw. Lots of work to try to coax a usable image out of these noisy, grainy, ugly files.
 
in the future, make sure you consult the goal posts. They do not change with a change in ISO. Use tools to expose, not the monitor. False color, a light meter, the histogram. These are your real friends. At 5000? Try neat video. Good luck.
 
Lewis-M Soucy said:
Hi all!

I forgot to change ISO after a night shoot and shot for 2 hours day footage at 5000 ISO instead of 800...

Now my footage is all grainy and crappy. Is there a way to correct this considering it's RAW and all that?

Thanks
Click to expand...

No.

At that amount of underexposure you can turn the noise into mush/goo/plastic looking image and colors will stay crappy.
 
Lewis-M Soucy said:
Well then I get a very underexposed footage...
Click to expand...

Thats not when your footage get underexposed... the underexposure was done at the moment of capture. Iso is noting but digital gain. So whats is and what is not captured has nothing to do with iso.
 
Hugh Scully said:
in the future, make sure you consult the goal posts. They do not change with a change in ISO. Use tools to expose, not the monitor. False color, a light meter, the histogram. These are your real friends. At 5000? Try neat video. Good luck.
Click to expand...

Just a note though, the Histogram will redistribute according to ISO.

If your low goalpost is full to the top you either have large dark (low reflectance) percentage of your image and/or a large part of your image is underexposed.

Another red flag can be the presence of lots of highlight information in your frame like street lamps but no clipping on your stop lights. You don't have to clip your street lamps (depending on intensity) but if your scene is under-lit you have to wonder about the ratio if you're 'getting it all'.

Having said that, if you were shooting at a displayed ISO of 5000 and you didn't twig from the sheer crawling noise on the RED monitor, it should be possible to tame it for the web IMO.
 
That's when you KNOW you're a real DP! Fuck checking the most basic settings on any digital camera or film stock, let's shoot, and fix it in post!
 
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