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(Course Logo: Adult walking with cane and holding a child's hand)Designing for the Life Span Segment 3

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Slide 18[D]

Slide 18 Content

We see shapes in colors differently...which of the following lines and characters appear in better focus:

The text 'The quick brown fox jumped over the lazy dog' in colors blue, green and red.

Owing to the lower quantity of blue photopigmentation in the eye- regardless of age, figures in blue light will appear to be fuzzier than figures depicted in either green or red light. As people age, as stated previously, it will become increasingly more difficult to focus on the edges of figures in blue. Reading blue text- especially blue text in the light emanating from a cathode ray tube such as a computer monitor will cause the eye to fatigue faster. White figures are the easiest to see because white light is a mixture of all color.


Narration of Slide 18

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Matching the value and intensity of red, green and blue is very difficult in computer graphics because the manner of projection and the specific technology alter the emission of color. This slide is meant to demonstrate that figures in blue light will be harder to see than figures in either green or red light. The figures in blue light may appear to be fuzzy. Also, the text in white light appears to be the brightest and should be more easily discernable.

Unfortunately, the contrast between the dark ground and the white figures may cause a bleed of the light beyond the edges. For that reason, this entire slide program has a figure/ground relationship using a high value warm orange against a relatively dark value gray ground. The text is easily seen without the harshness of the white light bleeding at the edges. Reversing the figure/ground relationship and having dark text of a white background means increasing background glare especially when images are projected.


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