Lesson 7 – White Balance

Life Through a Lens

 

This week we are looking at white balance, and the effect had by using the presets in our cameras settings both correctly and incorrectly in different lighting conditions.

White balance is a setting on your digital camera which allows for increased accuracy of the colours in a captured image. It allows for greater control and flexibility when needing to compensate for the myriad of different light sources and conditions that may be encountered, enabling a truer representation of the scene.

White balance presets on a typical DSLR camera:

  • Tungsten lightbulb (household filament)
  • Fluorescent lamps
  • Flash
  • Daylight (sun overhead)
  • Cloudy (moderately overcast)
  • Shade (shadowed)
  • Auto
  • Custom
  • User defined

In general photography, having the white balance set to ‘auto’ will usually suffice. It is worth noting however, that the auto setting for your white balance is most effective when there is at least one white or colourless and bright element in the shot. Whilst not being essential for every situation, if your subject does not include something of this nature, the auto white balance can be prone to over or under–compensating the colour temperature of the shot.

It is in these circumstances that it is worth knowing about colour temperature, white balance, and how to measure it and adjust for the best results.

Here I am going to take a moment to give a big shout out to Grandpa (Malc) pictured in the following slideshow… Lesson 7 in Sydney there no sunshine to be seen, and so it was impossible to conduct the WB experiments in daylight. Back home in Adelaide for a couple of weeks, I’m here staying with Grandpa; who despite never quite being entirely at ease for too long in front of a camera, agreed to model for me to demonstrate the Kelvin colour temperature scale in sunlight. My Grandpa is my favourite person and my greatest support in life, and in my pursuit of graphic design. He turns 94 on Thursday, still plays tennis and is a deadset genuine Aussie legend.

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The reason we need white balance settings at all is because different kinds of light have different colours. Our eyes are so effective at compensating and correcting for this that we often do not notice it until we looking at a photograph, when the colour cast suddenly becomes obvious. The majority of light sources, especially those that are natural light, give off a colour cast which ranges from a cool to warm, with neutral white in the middle.

The system of measurement for colour temperature from warm to cool is in units of Kelvin. The warmer a light source’s colour temperature is, the lower it’s number when measured in units of Kelvin. The red light of a flame will be at the lower end of the Kelvin scale, and the blue tinge of the sky on a clear day will be at the higher end.

20150330-white-balance-test-gyuri-glaszlo.com-WB-Kelvin-chart

White balance can be measured on two scales of colour: Warm to cool which is red or orange to blue, but also green to magenta. The warm to cool scale comes into play more commonly in situations like daylight, but modern artificial lighting situations such as Fluorescent bulbs may require adjusting on this green to magenta scale.

Experimenting in different light sources as in the examples here, and trying the different preset white balance settings is a great way to get a better understanding of the way these adjustment work and the effect of the Kelvin scale in photography.

More comprehensive info on the subject can be found here.

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Lesson 4 – Aperture

Life Through a Lens

This week we are addressing aperture, the second of the three facets which make up the ‘triangle’ of photography. Aperture is a measurement of  the amount the blades inside your lens open up to allow light to enter, and is measured in f stops. The wider an aperture, the more light is allowed in, and vice versa. This means that to compensate for a wider aperture (which will be measured by a low f stop, such as f1.8) a faster shutter speed is required to compensate and the same is true in reverse.

Aperture also controls the amount of area in focus, or the depth of field. A wider aperture, (e.g. 2.2) will give a shallow depth of field and a wider area that is out of focus in the foreground and background, otherwise known as bokeh. A smaller aperture (measured in larger numbers such as f22) will give you a much broader area of focus.

This week during the class exercise I was not feeling particularly inspired. I only had a prime lens with me having left my wide angle and telephoto lenses at home. On top of this it was pelting down with rain again and for whatever reason I was feeling unusually self conscious when going out to the city to shoot, so I let myself off the hook for once with the intent to complete the exercises later. Despite being last minute, I enjoyed the shoot I created today, and am myself partial to a wide aperture and a shallow depth of field.

Here is a link to an article with great explanations behind of the nitty gritty and mathematics behind aperture as well as other juicy details.

 

 

Lesson 2 – Black & White Composition

Life Through a Lens

 

Lesson two of ‘Life Through a Lens’ was my first lesson in attendance. We were given an hour to go out into the city and photograph examples of the five ‘rules’ of photographic composition with our cameras set to black and white. We were also to photograph some examples of breaking these rules. The five rules of composition were: the rule of thirds, leading lines, negative space, symmetry, and framing. I found it quite challenging to be wandering alone around an unfamiliar city, feeling quite conspicuous taking photos of everything. That said, I managed to take over 200 shots and was quite pleased with my final selection, which I think ended up being an interesting variety of subject and style.