#exposurecontrol

[jacqui-dennett]

18% Grey - White

For this exercise we had to take images on something white, in this case white paper folded on white paper

The camera doesn’t see the white as white, but as 18% grey, so in order to show the white in an image, to see in an image what the eye sees, we must compensate the exposure by increasing it prior to taking the picture.  

In this case the camera wouldn’t focus on just the white paper so I added a folded sheet on top to give some substance, something for the camera to focus on.

Below you will see a set of 3 images in one.

The first is set at 0 in the exposure compensator, the next at +1 and the third at +2. As you can see with each setting the paper becomes more white.

[piotrbaranowski]

   exposure compensation +1

exposure compensation +2

exposure compensation -1

exposure compensation -2

18 % Grey Exposure Control

The reason of overexposure a picture of a black on black subject  or  underexposure white on white subject is that the camera expects all the tones within the scene that it is metering to average out to a mid-grey tone also known as 18% grey

[williamshz]

EXPOSURE CONTROL TASK.

WHITE PAPER.

1) WHITE PAPER +1

2) WHITE PAPER +2

BLACK PAPER.

1) BLACK PAPER -1

2) BLACK PAPER -2

For this project I used my camera in P mode (programmed) as it says in the instructions to elaborate this task. We can see that the camera decides for the photographer resulting in a balanced photo, but following the instructions of this task we observe a change in the Exposure in the photographs. The white color as the exposure increases it loses its texture and the same thing happens with the black background photos with the difference that the exposure is reduced for this. I admit that both photos were a little out of focus, I must have focused manually, I think I should repeat the shots but unfortunately there are a lot of tasks to finish and so I had to leave them like that.

[finlaylaverygc]

18% Grey Exposure Control

White +2

White +1 

White Original 

Black Original

Black +1

Black +2

Using a black flower vase on a black card and a white lunar moon lamp on a white card, I experimented using the exposure compensation setting on the camera on white and black objects. As can be seen in the pictures above, both  original images without exposure compensation appear very grey and not their true colour or shade. With added compensation, the shade is improved to how it should be seen. 

@nqphotoblog​

[emmalyall2a]

18% Grey - Exposure Compensation

[lucyycheyne]

18% Grey

The camera automatically overexposes a photo of black on black (and underexposes white on white) because it uses reflected metering and sees everything as a midtone, also known as 18% grey.

[hannahlhnd2021]

18% Grey Project (07/11/20)

The top row of images is black material photographed on P Mode on my camera. The bottom row is white paper photographed on P Mode. Last image is black material shot on Manual Mode for comparison. 

In my own words, the reason white will be grey & underexposed while black is grey & overexposed through a camera’s lens, is that the camera does not understand the difference between absorbed and reflected light. The camera translates bright whites and dark shadows to mid tones.

[jacqui-dennett]

Exposure Triangle

The exposure triangle consists of Aperture, Shutter Speed and ISO. They work together to give the ideal exposure for a photographers work

The shutter speed is measured in seconds and determines for how long the shutter will remain open to allow light to reach the image sensor

The Aperture is measured in f-stop numbers and determines how much light is allowed into the camera to reach the image sensor, the smaller the f-stop number the more light is allowed in, the larger the f-stop number the smaller the hole and therefore less light is allowed in.  This also sets depth of field, the smaller the number and more light the shallower the depth of field, the larger the number and less light the more sharp the whole image becomes.

The ISO determines the light sensitivity of the sensor, the higher the number the mores sensitive the sensor is to light making the image brighter but also the image will have more grain / noise.  With a smaller ISO number the opposite is true, less light, less noise / grain