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I’ll Take a Slice
A slice of pizza, a slice of cherry pie, a slice of life — a lot of slices are out there. The type of slice that ImageReady and Photoshop creates is a mechanism for dividing up graphics for the Web.Depending upon what you’re going to do with an image, dividing it into slices has different benefits and uses. Some of the ways you can use slices include the following:Speeding up load time: By dividing a large image into many smaller sections, a graphic is processed by browsers as many small images instead of one huge one. Slices can let you put large images on the Web without making folks who visit your Web page wait too long.
Creating image maps: Image maps allow users to click an area of an image and be transported to another specified Web location. (Take a look at Technique 58 to find out how to create image maps.)
Creating rollovers: Rollovers are areas of a Web page that change when the mouse passes over them or performs an action such as clicking. (Technique 59 shows you how to create rollovers.)
Creating animated GIFs: If you surf the Web, no doubt you’ve seen some type of animation — a penguin hops across the Web page, a volcano appears to blow up — you can create animations using ImageReady. (Turn to Technique 60 to find out how to make animated GIFs.)
Slices are really an integral part of creating many types of Web graphics using ImageReady.You can create three different types of slices: user slices, auto slices, and layer-based slices. User slices are created manually using the Slice tool. Layer-based slices are created by using (what else?) layers. And, auto slices are the left over areas that Photoshop or ImageReady automatically turn into slices when user or layer-based slices are created. If an area isn’t included in a user or layer-based slice, it is auto- matically turned into one or more auto slices.
| Tip | You can create, select, and edit slices in Photoshop, but ImageReady offers more slice options. Thus, creating and managing slices in ImageReady is usually best. But, if you do use the Slice tool in Photoshop to create slices, you can jump to ImageReady and be assured that all slices and slice settings are preserved. |
Figure 56-1 shows the three different types of slices in use. Notice that each slice is numbered and has a special icon marking it as a user slice, auto slice, or layer-based slice.
Figure 56-1: Each slice is numbered and has an icon marking it as a user slice, auto slice, or layer-based slice.
