MT1: UNIT 4 COLOUR -Elements of multimedia

In this unit we will be learning about the basics of colour. We would also bring to light the benefits and challenges of using colour as well as the guidelines for using colours. Hope you will be able to grasp the key points.2.0 OBJECTIVESWhat you would study in this unit, would enable you to:Explain the basics of ColoursDiscover the science of ColoursDiscuss the benefits and challenges of using Colour

BASICS OF COLOR

Colour is a vital component of multimedia. Colour management is both a subjective and a technical exercise, because:

Colour is a physical property of light

Colour perception is a human physiological activity.

Choosing a right colour or colour combination involves many trials and aesthetic judgement.

Colour is the frequency/wave-length of a light wave within the narrow band of the electromagnetic spectrum (380 – 760nm) to which the human eye responds.

Colour is the visual perceptual property corresponding in humans to the categories called red, green, blue and others. Colour derives from the spectrum of light (distribution of light energy versus wavelength) interacting in the eye with the spectral sensitivities of the light receptors. Colour categories and physical specifications of colour are also associated with objects, materials, light sources, etc., based on their physical properties such as light absorption, reflection, or emission spectra. By defining a colour space, colours can be identified numerically by their coordinates.

Because perception of colour stems from the varying sensitivity of different types of cone cells in the retina to different parts of the spectrum, colours may be defined and quantified by the degree to which they stimulate these cells. These physical or physiological quantifications of colour, however, do not fully explain the psychophysical perception of colour appearance.

The science of colour is sometimes called chromatics. It includes the perception of colour by the human eye and brain, the origin of colour in materials, colour theory in art, and the physics of electromagnetic radiation in the visible range (that is, what we commonly refer to simply as light).

Colour space can be used as a model to identify colours numerically; for example, a colour can be specified by their unique RGB and HSV values.

3.2 BENEFITS AND CHALLENGES OF USING COLOUR

Benefits:

Colour is important for effective display and hardware design because it makes the screen layout attractive; may reduce user’s interpretation errors; emphasize logical organisation of the information; and is very efficient at drawing the user’s attention to a given part of the screen.

Challenges:

However, Colour is difficult to use correctly. The environment affects human colour perception e.g. lighting conditions may change the colours seen to less effective ones in display terms. Annoying after-images may be produced if a block of saturated colour is on

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CIT 463    INTRODUCTION TO MULTIMEDIA TECHNOLOGY

display for a period of time. In addition, colour ‘blindness’ may significantly alter the appearance of a display for those affected by it, e.g. approximately 6% of men have difficulty distinguishing between shades of red and green.

4.0 CONCLUSION

In this unit, we discovered that Colour is a vital component of multimedia. Management of colour is both a subjective and technical exercise. Colour is a frequency of a light wave within the narrow band of the electromagnetic spectrum to which the human eye responds.

Colour is important for effective display and hardware design because it makes the screen layout attractive; may reduce user’s interpretation errors; emphasize logical organisation of the information; and is very efficient at drawing the user’s attention to a given part of the screen.

5.0 SUMMARY

This unit highlighted the rudiments of colour in multimedia. The benefits and challenges of using colour as well as the guidelines for using colour were equally presented. We hope you enjoyed your studies.

6.0 TUTOR MARKED ASSIGNMENT

1) ·Give a concise explanation on the basics of Colour

2).Explain the concept of “Chromatics”

3).Describe the benefits of using colour

4). State the challenges of using colour.

SELF ASSESSMENT EXERCISE

Explain the term Chromatics?

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