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Photoshop cs5 by steve Johnson part 18

Tạo ra một lựa chọn từ một Layer Photoshop cơ bản của các lớp truyền thống chức năng như tấm nhựa trong suốt hoặc acetate rõ ràng. Sau khi tạo ra, họ hỗ trợ tất cả các công cụ vẽ của Photoshop, cũng như hình dạng và công cụ gradient. Trong khi các lớp truyền thống có thể bắt đầu ra minh bạch, họ không còn như vậy cho lâu dài. | Creating a Selection from a Layer Photoshop s traditional layers basically function like sheets of transparent acetate or clear plastic. Once created they support all of Photoshop s painting tools as well as shape and gradient tools. While traditional layers may start out transparent they don t remain that way for long. In fact a layer can over time become a complicated mix of non-transparent the image and transparent areas. It s also possible you might want to make a selection out of that complicated image. Photoshop knows this and gives you an easy way to create a selection from a layer. If you want to move a selection you can drag the selection marquee even if the layer is hidden New . Create a Selection from a Layer Select the Layers panel. Hold down the Ctrl Win or A Mac key and then click on the image thumbnail of the layer you want create into a selection. Be sure you click on the image thumbnail not the layer name as you would have in previous versions. The visible portions of the image on the layer are created into a selection. IMPORTANT Since Photoshop creates the selection based on the image information there must be transparent and non-transparent areas within the image or the command selects the entire layer as if you had clicked the Select menu and then clicked All. Selection based on the visible portions of the layer. 110 Chapter 5 Creating a Layer from a Selection On the previous page you learned how to create a selection based on the image information within a layer. In addition to creating a selection from a layer Photoshop gives you the ability to instantly create a layer from a selection. Creating layers from selections opens up all kinds of opportunities for generating special effects. For example you could select an object from one layer and then make a layer with that selection or you could make a selection of just that portion of an image and then apply a layer style to the new layer copy. The possibilities are endless and part of the fun of