Perception

•Perception is a fundamental principle of HCI and is all about how someone sees something. A user may not be able to see very fine details e.g. A GUI. In a GUI the importance of colour can be overlooked by the user or the position of the GUI on the screen can be overlooked.

• These parts allow the user to  have easier access to things. In the image can you see a rabbit, or a duck, or can you see both?

http://en.wikipedia.org/wiki/Rabbit%E2%80%93duck_illusion

•Not everyone has the same vision, some have colour blindness  (only certain colours). You must be careful about what colours you put on a background or it could cause problem you should mainly avoid putting red on blue, yellow on blue, red on green  or  yellow on blue.

•People from different countries can perceive colours differently but colours we associate for different states of things could be  Green for normal or OK, Orange for caution, Red for problem.

•A trichromatic system is a theory which goes about the idea that your visual system can maximally see three colours and that other colours are seen through combinations of the three colours

•Luminance is about light passing through (or being emitted from) an object.

•‘Pop out’ effect is about having an image and editing the colours to where they look like they are coming out of the screen.

http://www.psych.ucalgary.ca/PACE/va-lab/colourperceptionweb/theories.htm

 There are a few laws of perception:

•Law of proximity- This laws is all about how we perceive things when they are close together.

•Law of similarity- This law is all about how the same shapes come together in our minds.

•Law of symmetry- This law is all about how the rest of a shape can come together with only a small amount of that shape.

•Law of closure- This law is all about being able to see shapes or letters without them being complete.

•Law of continuity- This law is all about having a colour or a button running throughout a whole presentation.

•Law of common groupings- This law is all about when people see a set of things that are similar and put them into a group together.

•Law of connectedness- This law is all about when two objects look like they fit together to make a whole object.

•Geons are 2D images which are going to be turned into 3D images so they are easy to recognise. These shapes aren’t expensive to produce.

http://www.whatmakesthemclick.net/2010/12/30/100-things-you-should-know-about-people-49-the-brain-looks-for-simple-patterns/

•Gross 3D shapes are shapes which are 3D and these are mainly used In video games. These shapes aren’t expensive to produce.

http://www.ahornung.net/publications.html