ISO and Gain



- The Camera - "ISO & Gain"

What is ISO? It is a setting on a camera that allows you to change an image to brighten or darken.


What is the visual difference between low and high ISO? Low ISO photos will result in less grainy (noise) photos, whilst higher ISO will result in more grainy photos. Higher ISO, however, can also add more brightness to the photo.


When do you use a lower ISO? When do you use a higher ISO? Lower ISO may be used in a setting that is already bright, whilst higher ISO may be used if there isn't another way to increase the brightness (such as when using high shutter speed). This allows for less motion blur to appear on images when trying to take a picture of a fast-moving subject.

High V. Low ISO Internet Examples


Room Experimentation


The darker room image looks a lot more grainy with noise, while the lighter room image looks a lot more clear.

What is gain? It boosts video signal on a camera, allowing for more brightness by "fooling the camera" into thinking it has enough light.

When do you need to add or not add gain? Gain can be used to change brightness "on the fly" during the middle of a recording when ISO can't be changed. Gain should be used during recording when the setting getting gets too bright (lower gain) or too dark (add gain). The higher the gain, however, the more that the video suffers from video noise. One way gain can be used is during live stage performances, when lighting changes throughout.

Experimentation


As the db went up on the camcorder, the amount of noise shown on the video also went up, making the video less clear. The change in exposure for the camera shown in the studio is a lot more noticeable, as the room turned brighter and brighter.

100
200

400

800

1600

3200

When I compared the image with 100 ISO to the 3200 ISO, there was a noticeable difference in the amount of noise when zoomed in on the walls. On the 3200 photo, there is lots of noise that made the photo unclear, whilst on 100 ISO, the walls had little to no noise.

 

Comments

Post a Comment

Popular posts from this blog

On The Spot Post-Production

Image
On The Spot - Post Production This was definitely the most time-consuming project out of all of them this year. Besides that, however, it was a lot of fun getting to film things outside of the classroom and put some own creative spin on my own work.  Choosing The Right Music I was inspired by a few things from the videos shown in class. For one thing, I learned just how important sound is as the actual video itself. The sound is able to captivate the audience by following a certain tone that is easy for the viewer to understand. This was the hardest thing for me to do as it required a lot of thinking on my part in order to captivate this same feeling- I couldn't just slap any random music and call it a day. The search for the right kind of music was the most annoying part of this project for me because of this. I would play some songs found on bensound over my project, but none of them worked out. A silly thing I found out was that Jazz songs actually fitted well in the background
Read more

The Camera - Aperture & Iris

Image
  - The Camera - "Aperture & Iris"                What is aperture?   It is essentially the "pupil" of a camera lens, in which the lens "open" and can be shrunk or enlarged in order to allow more or less light into the camera sensor.                  How does it affect exposure?   It changes the amount of light that is able to reach the camera sensor. Large, wide openings of the aperture will result in brighter photos because more light is passed. A smaller, tight opening of the aperture will result in darker photos because less light is passed. How does it affect depth of field?  A large aperture will yield greater background blur, whilst a small aperture will yield little background blur. How do you pick the right aperture for your scene?  When capturing photos in bright/dark environments, a smaller/larger aperture may want to be used since aperture affects exposure. This allows for less light on sunny photos, or more light on photos taken at night.
Read more

EQ

Image
  - Sound Design - "Equalization & Microphone Types" What is the difference between dynamic and condenser microphones?   I n terms of sensitivity, condenser mics are more sensitive compared to dynamic mics. Dynamic mics also require no power, while condenser mics require a battery or phantom. What is directionality?   It is the "pickup pattern" of a microphone in which your microphone can pick up sound from a particular direction. There are three basic types such as omnidirectional, cardioid, and super-cardioid. Omnidirectional can pick up sounds equally from all directions, while cardioid is more sensitive to sounds from the front.  Why would you use a lavalier? A shotgun? A dynamic?   It all depends on the scene's situation. Lavaliers and shotguns are better used when the subject needs their hands free in the shot for things such as hand movements and presentations. Shotgun microphones are also ideal for scenes in which the subject is farther away from you
Read more