TAILIEUCHUNG - Sử dụng photoshop cs5 part 49

Nhiếp ảnh gia sử dụng các kỹ thuật tập trung để phổ khúc một cảnh, chẳng hạn như vết mờ để truyền tải chuyển động hoặc độ sâu của một nông trường để tương phản một chủ đề trong-tập trung với nền của nó. Trong Photoshop, bạn có thể áp dụng hiệu ứng tương tự đặc biệt, và cũng đúng cho các khuyết tật sản xuất bởi một ống kính camera. | Photographers use focusing techniques to orchestrate a scene such as blurriness to convey motion or a shallow depth of field to contrast an in-focus subject with its background. In Photoshop you can apply similar special effects and also correct for defects produced by a camera lens. In this chapter you ll apply the Lens Blur filter and use vignettes to create a focal point in a photo apply the Lens Correction filter to correct for camera lens distortion apply the Motion Blur filter to simulate motion and use the Sharpen tool and the Smart Sharpen and Unsharp Mask filters to resharpen the image. Applying the Lens Blur filter In a photograph some parts of the scene are more in focus than others. If your camera lets you adjust the depth of field via the aperture or f-stop setting it s not a point-and-shoot type of camera you can control how much of your subject matter stays in focus. Objects that are outside the depth of field either in front of it or behind it will be blurred. Other factors affecting the focus are the zoom setting and the camera lens. The Lens Blur filter in Photoshop attempts to replicate this type of blurring. What formerly required the use of multiple channels gradients and editing steps can now be accomplished with a single filter. All of this number crunching does have a price however The filter may process slowly on a large image. To apply the Lens Blur filter 1. Click an image layer or duplicate the Background via Ctrl-J Cmd-J then click the Add Layer Mask button J-3 on the Layers panel. 2. Keep the layer mask thumbnail selected. Choose the Gradient tool El G or Shift-G click the Gradient picker arrowhead on the Options bar and click the Black White preset. Shift-drag across the entire document window vertically or horizontally to apply the gradient. The Lens Blur filter is going to use this gradient invisibly. Keep this in mind when you choose a Blur Focal Distance setting in step 5. Don t concern yourself with where the white and black .

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