Exposition time on point and shoot camera

[Eildosa]

Hello,

Is exposition something physically done by the camera (shutter time slower or higher? or something else) or just a post digital treatment done by the camera microcontroller?
I'm using 21*coolpix L27 to do a 3D scanner, setting the exposition is time consuming, is this is just a digital treatment I could take pictures with regular exposition then use photoshop.

example, same subject, same light:
exposition -1

exposition - 0

exif data :

if you look at the exif data you can see that the "exposition time" is 1/25 for both of them.
polarisation however seems to represent what the camera call "exposure", what is this?

Thanks

 

[Eildosa]

It appears that the software I uses has been translated with someone's feet.
The polarisation column is named "compensation" on english exif.

The question still stand, is this compensation just a digital filter?

 

[Designer]

Hello,

Is exposition something physically done by the camera (shutter time slower or higher? or something else)

if you look at the exif data you can see that the "exposition time" is 1/25 for both of them.
polarisation however seems to represent what the camera call "exposure", what is this?

In English-speaking countries, the usual term is "exposure". Root word: expose

The exposure is determined by a combination of the shutter speed (duration/durée), the ISO (vitesse ISO), and the aperture (focale).

 

[Eildosa]

sorry, technical vocabulary is always hard to find when you are not familiar with the field.
So it's not a digital filter, the ISO is lower when the exposure is lower.
Thanks.

 

[The_Traveler]

perhaps not.
there are three factors that determine the exposure - shutter speed, aperture and ISO.
Low ISO means less noise.
Only raise ISO if good combination of shutter speed and aperture is not available.

Sorry, I tried to find an explanation of exposure triangle in French but could not.
Perhaps Wikipedia in French