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Photoshop cs5 by steve Johnson part 15

Thêm và Trừ một lựa chọn Để nói rằng Photoshop giúp bạn dễ dàng thực hiện lựa chọn sẽ là một sự. Không chỉ bạn có thể thay đổi lựa chọn trong nhiều cách, Photoshop cho phép bạn tùy chọn để thay đổi tâm trí của bạn bằng cách thêm vào và trừ đi đến một lựa chọn hiện tại hoặc thậm chí sử dụng các công cụ lựa chọn để cắt hình ảnh. | Adding and Subtracting a Selection To say that Photoshop helps you make selections easily would be an understatement. Not only can you modify selections in any number of ways Photoshop gives you the option to change your mind by adding and subtracting to an existing selection or even using the selection tools to crop the image. Since most selections are not perfect the first time around knowing how to modify a selection marquee gives you the control you need to make perfect selections. Adding to and subtracting from an image is accomplished by simple keyboard shortcuts or by making choices from the Options bar. Either way you can create complex selections with ease. Add to an Existing Selection Create a selection using any of the selection tools. Add to the selection by holding down the Shift key and then use a selection tool to add to the existing selection the selected areas do not need to be contiguous . Release the mouse and the Shift key to complete the addition. Subtract from an Existing Selection Create a selection using any of the selection tools. Subtract from the selection by holding down the Alt Win or Option Mac key. Create a selection that intersects with the existing selection. Release the mouse and the keys to complete the subtraction. Two separate selections moch-aotfi pia f low 90 Chapter 4 Cropping a Selection Cropping a document brings focus to the information contained within the image. For example you take a photograph of an insect on a flower. To increase the focus on the insect then crop out the flower. Cropping eliminates distractions which would otherwise take away from the message of the image. With the Crop tool you can select the cropping area and then adjust it using a cropping shield and guide overlay New . Crop a Selection Select the Crop tool on the toolbox. Drag a selection around the area of the image you want to crop. To adjust the selection drag a selection handle. Click the Crop Guide Overlay list arrow on the Control panel and