TAILIEUCHUNG - Tài iệu Photoshop cs5 by Dayley part 95

Áp dụng các bộ lọc trực tiếp đến hình ảnh của bạn thay đổi các giá trị điểm ảnh thực tế và thay đổi dữ liệu gốc. Mặc dù bạn có thể sử dụng tùy chọn Lịch sử để quay trở lại tình trạng ban đầu, sau khi bạn lưu các tập tin của bạn, những điểm ảnh đã bị thay đổi ngoài hồi phục. | Part VI Artistic Effects FIGURE Moving the Accented Edges effect below the Splatter effect can change the end result on the image dramatically. Using Smart Objects to Make NonDestructive Filter Adjustments Applying filters directly to your images changes the actual pixel values and modifies the original data. Although you can use the History option to get back to the original state after you save your file those pixels have been altered beyond recovery. Additionally you may need to try several filter methods and sometimes combinations of filters to get the adjustment you are looking for which is hard to do when you are trying to apply more than one filter especially if some of your filters are not found in the Filter Gallery. That is where Smart Objects can make a huge difference. When you apply a filter to a Smart Object it is applied as a Smart Filter that can be turned on and off adjusted reordered and easily removed without destroying the underlying pixel data. The best way to apply filters to images in a non-destructive way is to create a duplicate layer of the background and then turn that layer into a Smart Object. You also can simply turn the background 668 Chapter 20 Applying Filters layer into a Smart Object layer but if you keep the background layer around you can always create a new duplicate layer later to try another set of Smart Filters on. Use these steps to create a duplicate of the background layer and then apply Smart Filters to it 1. Open the image in Photoshop. 2. Right-click the background layer and select Duplicate Layer from the pop-up menu shown in Figure . This displays the Duplicate Layer dialog box. 3. Name the layer in the Duplicate Layer dialog box shown in Figure and click OK to create the layer. The new layer is added to the Layers panel. FIGURE By creating a second layer the original layer is preserved in its original state. 4. Right-click the new layer and select Convert to Smart Object from the pop-up menu .

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