In the absence of flash, a torch can be used with a daylight bulb fitted or the conventional tungsten bulb if you prefer the warmer colour cast
Night scenes can include various sources of man-made light, which give off colour casts
very different from natural light.
Most cameras have an automatic white balance (AWB) setting that corrects for the colour cast
related to the light source.
City lights may appear bright to our eyes, but the reality is that their different sources (fluorescent, halogen, sodium, tungsten, neon) provide varying levels of intensity as well as colour cast
. The strength of these lights dissipates rapidly from the source, and while our eyes adjust quickly for such variations, a camera's image sensor is less forgiving.
We did notice a slight amount of colour cast
around the sharper edges while shooting in the macro mode.
But, whereas the human eye is highly adaptive to different types of lighting and colour temperatures, a film camera isn't, and requires the addition of a colour-correction filter to the lens or tungsten-balanced film to compensate for the colour cast
. With a digital camera's white balance control, photographers can digitally compensate for the colour temperature, so that the colours in an image appear more natural.
As with most colour films, the image sensor of a digital camera is daylight balanced, so images made of subjects lit by artificial light sources will show a particular colour cast
: normal household light bulbs (tungsten) produce a warm orange cast, while fluorescent lights produce a green cast.
Keeping the WB set to daylight will result in a distinct colour cast
on the image: orange for tungsten, green/blue for neon or fluorescent.
* shoot with an 81-series warm-up filter to give stonework a more appealing colour cast
in overcast conditions
According to Canon, the advanced multi-area white balance technology detects multiple light sources and corrects the colour balance for each, removing unsightly colour casts
to give more natural results.
PDF Polisher-Pro also offers customisable presets for specific needs, such as faces, jewellery and deliberate colour casts
, which apply different levels of contrast, sharpness and colour correction, the company said.
As the colour temperature increases from low to high, the colour casts
rendered change in the following sequence: red, orange, yellow, white and blue/white.