The camera always sees things as grey unless you tell it otherwise.
If you take a photo of a plain black or white background, the camera doesn’t have any other colours to compare it to and it will therefore appear grey.
When photographing something white, the camera will underexpose
When photographing something black, the camera will overexpose
A camera doesn’t automatically know what you want to do with a photo. You have to tell it what you want from the picture, in terms of ISO, Aperture, Exposure Compensation etc.
HDR stands for High Dynamic Range. When your camera is set to HDR, it will take a lot of photos at different exposures and then stack them together to get an even contrast. (i.e. the correct level of brightness.)
Auto White Balance. You can change this to determine the colour of your photos. If you find that your photo is yellow, change the white balance to suit the environment you’re in. On the camera, there are various white balance settings, such as daylight, shade, cloudy, incandescent, warm white, cool white etc.
The following photos were taken using different white balance settings. The photo on the left was taken with an indoor light which made it look yellow. By using a different white balance setting, the photo on the left has a more natural looking colour.
Adjusting the white balance doesn’t change the exposure – only the colour.
You only need to use your AWB feature when shooting jpgs. When shooting in RAW, you can change the whitebalance afterwards in a photo editing program. If you use the incorrect white balance when taking a photo in jpg format, it is harder to correct.
Criteria covered in this blog:
Unit 01: 1.6, 2.3, 2.4, 2.5, 2.6, 2.8, 2.10