Human Interface - visual perception and models of interaction.

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Michael Gill

Unit 23 Task 2

Perception Colour e.g. trichromatic system

Colour affect users in several of ways such as some people find yellow font very hard to read on a white background and some find it very easy to read. For 3D effects the trichromatic system is designed, which consists of three main different colours. These are red, blue and green. Selecting the right colour when a GUI is designed is essential. If the GUI has wrong colours or dull and boring doesn’t attracts people to use it. Microsoft Office 2007 has grey as its main colour which is very boring, but the blue used on the toolbar makes it up for it and the orange highlight of the selected tools make it more abstract. These colours are very eye catchy and don’t make it look boring.

Perception luminance

Luminance is how bright a light colour appears to a viewer and that which our brain can handle. For instance, if a bright yellow font would be displayed on a white board could make the text hard to see or to read. Designers of GUI do not take any consideration of the user’s computers screens brightness. So for that reason the rule is in order to display the best details means to use luminance contrast.

Perception Pop out effect

The Perception pop out effect, allows something to "pop out" on a display. A target made up of a combination of non-unique features that normally cannot be detected pre-attentively. Another important consideration is the effect of different types of background distracters on the target. For example a picture consists of blue squares and includes a red square. The eyes will automatically target the red square, because it looks totally different from the other and is outstanding. This is what the pop out effect is.

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Perception pattern e.g. proximity

Most users will think that the pattern is just a part of the GUI as the design or layout, but for the designer it is the template. In Microsoft dialogue boxes makes it easier for the user to use and to get to get use to it. There are seven laws of pattern proximity, continuity, symmetry, similarity, fate, region and connection. Each of the patterns has a different task.

  • Proximity- These are things seen that are close together as a group.
  • Continuity- Smooth continuous lines are easier to read compare to fast lines.
  • ...

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