TAILIEUCHUNG - Adobe illustrator cs4- P16

Adobe illustrator cs4- P16: Good designers have many tools at their disposal. Especially in an environment where most designers have other powerful graphics applications, it can be diffi cult to choose which one to use for a particular task. For example, a designer can apply soft drop shadows in Photoshop, Illustrator, and InDesign—is one application any better than the others for this? | 424 CHAPTER 13 WEB AND MOBILE DESIGN 5. Using the Rectangle tool draw a rectangle on the artboard. Specify a fill of red and a stroke of none. You can clearly see that the boundary of the rectangle aligns precisely with the pixels on the grid Figure . Use the Selection tool to move the rectangle around and you ll find the shape snaps directly to the grid. Figure With the grid visible you can clearly see where the path edge lines up with the pixels. 6. Apply a 1-pt black stroke to the rectangle. Instead of a nice 1-pixel black border the rectangle now appears with an odd 2-pixel border that consists of a variety of shades of gray Figure . Figure Because of the pixel grid and the antialiasing a 1-pixel black stroke appears as a fat gray stroke. CREATING PERFECT WEB GRAPHICS 425 When you add the 1-pt stroke Illustrator paints that stroke along the center of the path. But since the path is aligned perfectly to the grid the stroke weight is distributed a half pixel on both sides of the path. Since you already know that pixels can contain only one solid color the antialiasing that Illustrator applies to the art results in a 2-pixel fat gray line Figure . Figure This is a perfect example of how valuable the Pixel Preview feature is in Illustrator. On the left in Preview mode the stroke around the rectangle appears normal. On the right in Pixel Preview mode you can clearly see the effect of the antialiasing. When you hear web designers talk many say they use Photoshop or Adobe Fireworks CS4 to create their web graphics not Illustrator. More often than not the reason behind their decision is because of the antialiasing issues we have covered here. But it s not all bad Illustrator offers tremendous value to web designers and in my humble opinion it s foolish to overlook some of the great benefits of using Illustrator for web design work. After all we still have plenty of chapter left. With that in mind there are workarounds to everything .

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