Carefully balanced flash lighting improves still life photos
The colour of light changes according to its source, such as daylight. But even that varies; it is warmer (more red) at sunrise and sunset than in the middle of the day when it is cooler (more blue). The light on a cloudy day, or in the shade on a sunny day, is cooler still. These different colours are referred to as the colour temperature of the light source.
Similarly, artificial light sources have their own colour temperatures. Light from tungsten bulbs is orange whilst fluorescent tubes create a green light.
Your eyes automatically adjust for these differences in colour temperature and the ‘AWB’ (Auto White Balance) on your EOS normally mimics them successfully. If you are shooting raw files, setting the correct white balance is not critical – you can adjust this when viewing the image with Canon’s Digital Photo Professional (DPP) software on your computer. If you are shooting JPEG files, you do need to get it right. Shoot several images with different white balance settings and study the images on the back of the camera to see which gives the best result.
However when you are close to a colourful subject, Custom White Balance will give the most accurate images. Setting this varies a little between camera models, but essentially you move in to fill the frame with a sheet of white card or paper and take a shot. The camera uses this neutral image to set a custom white balance. You can also use this feature to deliberately control the colour balance of your photos, for example adding orange/ brown for a vintage feel to images.
Check your User Guide for step-by-step details.