tailieunhanh - Tài liệu Photoshop cs5 by Dayley part 48

Các mặt nạ lớp Hãy nghĩ về một mặt nạ là một stencil. Nếu bạn đặt một stencil trên một khu vực mà bạn đang vẽ, nó bảo vệ các khu vực được bảo hiểm và tạo ra một thiết kế sơn mặc cả. Mặt nạ trong Photoshop làm việc theo cùng một cách, nhưng bạn có thể làm được nhiều hơn với một hình ảnh hơn là chỉ vẽ trên nó. Tất cả các phụ kiện hoặc bộ lọc có sẵn trong Photoshop có thể được áp dụng cho phần chỉ là một hình ảnh của bạn trong khi rời. | Chapter 10 All about Layers FIGURE Making the Water Paper filter the base of the filters added is a better result than placing it on top. Layer Masks Think of a mask as a stencil. If you place a stencil over an area that you are painting it protects the areas that are covered and creates a painted design in the bargain. Masks in Photoshop work the same way but you can do so much more with an image than just paint over it. Every enhancement or filter available in Photoshop can be applied to just a portion of your image while leaving the rest of your image untouched using masks. Wait a minute. Doesn t this sound just like what a selection does It s true a selection is actually a type of mask a selection mask and I ve already shown you how to work with Quick Masks and the color overlay masks to refine your selections. Now we re going to move one step beyond selections to Layer Masks which are more permanent extensions of selections. A layer mask is what most people think of when thinking about masks in Photoshop. Figure shows a layer mask. Just like a stencil the black parts cover areas of the image that will be unaffected by any changes made to this layer. It also makes those areas transparent so that any layers underneath will be visible. The white areas of the mask are areas that will be affected by any changes made to the layer. These areas behave just as if they were all the image pixels contained in this layer. For instance you can see in Figure that the Drop Shadow Layer Style that was added created a drop shadow only of the unmasked areas of the image. 327 Part III Selections Layers and Channels FIGURE Placing a mask in a layer protects portions of it from edits. One of the best aspects of using digital layers over stencils is that it is incredibly easy to create semi-permeable areas of a mask with grayscale tones. The lighter a grayscale area is the more any changes you make to your image affect those areas. Creating masks You can .