TAILIEUCHUNG - Tài liệu Photoshop cs5 by Dayley part 40

Các công cụ Elliptical Marquee có thể được dùng để chọn tròn hoặc hình bầu dục các đối tượng trong hình ảnh của bạn, để sao chép các khu vực làm tròn của hình ảnh của bạn vào các tài liệu khác, hoặc tạo một hình nền. Tôi thường sử dụng nó khi điều chỉnh một trường hợp khó khăn của mắt đỏ. | Part III Selections Layers and Channels FIGURE Using the Quick Mask makes it easy to see how feathering the edges of a selection softens it. The Elliptical Marquee tool The Elliptical Marquee tool can be used to select round or oval objects in your image to copy rounded areas of your image into other documents or to create a vignette. I often use it when correcting a tough case of red-eye. It s a little trickier to use than the Rectangle Marquee tool because you have to imagine a box around the oval you want to draw and start at the top corner of that box to get the selection placed just right. It s mostly a matter of practice and trial and error. The good news is that if you get the right size you can always pick the selection up and move it to the right position. Tip Holding down the Shift key while you use either the Rectangle or the Elliptical Marquee tool results in a perfect square or a perfect circle depending on the tool of course. Using the Lasso tools The Lasso Selection tools have been in Photoshop much longer than the Quick Selection tools and in many ways have been superseded by them. Before the Quick Selection tool the Magnetic Lasso was the best tool in the arsenal for selecting irregular edges that blended into the background now mine s a bit dusty. The Lasso and the Polygonal Lasso tools can still be very useful and I show you how to use them. Lasso tool options The options for the Lasso and the Polygonal Lasso tool are identical. They are also very similar to the options for the previous selection tools discussed in this chapter. The Magnetic Lasso tool has the most involved option menu of all the selections tools so I cover the additional options in the Magnetic Lasso tool section. Tool presets You can save and retrieve your favorite tool settings using this drop-down list. Click the little black arrow to see a menu of available options. 272 Chapter 9 Creating Selections New selection When this option is highlighted every time you use the .

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