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Kamis, 06 November 2008

Emphasis

Closely related to the idea of unity is the concept of emphasis or dominance. Rather than focusing on getting the various elements of a design to it together, emphasis is about making a particular element draw the viewer’s attention. When you design a web page layout, often you’ll identify an item in the content, or the layout itself, that you want to stand out. Perhaps it’s a button you want users to press, or an error message that you want them to read. One method of achieving such emphasis is by making that element into a focal point. A focal point is anything on a page that draws the viewer’s eye, rather than just feeling like part of the page as a whole or blending in with its surroundings. As with unity, there are a few tried and true methods of achieving a focal point.

Placement

Although the constraints of practical web design do not often allow for it, the direct center of a composition is the point at which users look first, and is always the strongest location for producing emphasis. The further from the center an element is, the less likely it is to be noticed first; for an example of this, see Figure 1.19.






Figure 1.19: Continuance and placement—creating emphasis

Continuance

The idea behind continuance is that when our eyes start moving in one direction, they tend to continue along that path until a more dominant feature comes along. Figure 1.19 demonstrates this effect. Even though the bottom splotch is bigger and tends to catch your eye first, your brain can’t help but go “Hey, looky there, an arrow!” You’ll soon find yourself staring at the smaller object.

Continuance is also one of the most common methods that web designers use to unify a layout. By default, the left edge of headings, copy, and images placed on a web page form a vertical line down the left side of a page before any styling is applied. A simple way to expand on this concept is to use the rule of thirds to line up other page elements along the lines of your grid.

Isolation

In the same way that proximity helps us create unity in a design, isolation promotes emphasis. An item that stands out from its surroundings will tend to demand attention. Even though he’s sad to not be with his buddies on the other page, the isolated monkey in Figure 1.20 stands out as a focal point on the page.







Figure 1 20: Isolation

A sad monkey

Contrast

Contrast is deined as the juxtaposition of dissimilar graphic elements, and is the most common method used to create emphasis in a layout. The concept is simple: the greater the difference between a graphic element and its surroundings, the more that element will stand out. Contrast can be created using differences in color (which I’ll discuss in more detail in Chapter 2), size, and shape. Take a look at Figure 1.21.










Figure 1.21: Woot using orange for contrast

The site is Woot, an ecommerce web site that sells just one item per day. When you look at this layout, what’s the first thing that grabs your attention? My guess is it’s probably the product they’re selling. Products at Woot change daily, though, so what grabs your eye I want one! Button although the same colors are used elsewhere after that? For me, it’s the in the design, the oval shape isn’t. When set against an area of white space, the button has both contrast and isolation working to emphasize it. The owners of Woot really want you to click that button.

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