tailieunhanh - Photoshop cs5 by steve Johnson part 42

Một khi bạn tạo ra một mặt nạ kênh trong một tài liệu, có thể di chuyển mà mặt nạ kênh để tài liệu khác. Trong khi các mặt nạ kênh nhất là để cụ thể cho một tài liệu cụ thể nó sẽ không được thực tế để di chuyển chúng, một mặt nạ kênh xác định một sự lựa chọn của một cây cụ thể chống lại một bầu trời xanh, cho ví dụ, mặt nạ nhiều kênh có thể được sử dụng hơn và hơn nữa. | L6J Select the Operation option you want to perform New Selection. Creates a new selection. Add To Selection. Adds the channel mask to an existing selection. Subtract From Selection. Uses the channel mask to subtract from an existing selection. Intersect With Selection. Uses the channel mask to intersect with an existing selection. Q Click OK. H For Your Information Working with Channel Masks Channel masks provide control over the selected areas of an image. By default the white areas of the mask represent the selected areas and the black areas represent the masked areas. When a mask is applied to an image the black and white areas of the mask create a very sharp-edged selection. To soften the effect of the mask click the Filter menu point to Blur and then click Gaussian Blur. Apply a small amount of blur one or two pixels to the mask. Now when the mask is applied to the image the Gaussian blur will soften the effects of the selection and create a visually softer transition. Chapter 10 Creating Masks 259 Moving Channel Masks Between Documents Once you create a channel mask in one document it is possible to move that channel mask to another document. While most channel masks are so specific to a particular document it wouldn t be practical to move them a channel mask defining a selection of a specific tree against a blue sky for example many channel masks can be used over and over again. For example you might have a series of channel masks creating unique selection borders around an image. You spent a lot of time creating the borders and you would like to apply those same border selections to other images. If that s the case then increase your efficiency by saving them as channel masks and moving them between documents. Not only will it save you a lot of time but using selections more than once can add a sense of cohesiveness to a design. Move Channel Masks Between Documents Open a document that contains a channel mask. Open a second document this is the document .