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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. ...read more.


This means where audio and video signals are transmitted instantly. As well as the costs need to be considered. In some cases costs become less of an issue, such as the use of gross 3D image produced from a robot might be essential to represent a realistic picture and would be used without any regard of cost. Behaviour models: predictive models e.g. reaction time A number of models will predict the way in which an interface or user will behave. There are countless of predictive models that provide guidance when an interface or system is designed. This is a method to pre-empting what will happen without carrying out a long research and delay the introduction of the interface by letting people test it out. Reaction time is to respond to a command from a GUI. This will vary depending from the user. Consideration needs to be given when or not the interface will be responsible for time. Keystroke Level Model (KLM) The Keystroke level model recognises very low level of action. This model separates each sequence and operates in individual actions. This would be such as clicking the mouse, hitting the keys on the keyboard, pointing the mouse and so on. Each action is placed in an order of time to which it calculates the respond of the system. Throughput (TP) Throughput is related to the productivity of computers. It measures the amount or speed of processing in respond of a command. ...read more.


Guiard?s model indentify users who use both hands are unlikely to perform the equal effectiveness action with either hands. Information processing: humans as a component This explores how information is processed and how fast it is done. One of the key differences in HCI design is the human end user. It isn?t only difficult to manage but it can be also difficult to identify people needs and aspiration. One way to prepare for all is to carry out a risk assessment. Human information processing (HIP) HIP means the way we actually absorb the information, analyse and use it and do something with it. Our brain takes the information in and then uses the mind to process it. The output depends on previous knowledge and the ability to interpret information and even our willingness to do something with it. Improvements could be archived by changing the data provided, by improving ability of decision making and by construction of formal models of human decision making. Overview of goals, operators, methods and selection (GOMS) GOMS predicts the time it will take to carry out an action or to follow a command. The designer identifies the outcome by using a series of methods, in order to carry out an action. This allows the designer to calculate the time it will take to execute the action and to identify any risks. The designer can use the results to identify which of the methods is the best of user interface, based on the requirements. ...read more.

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