tailieunhanh - Photoshop cs5 cho nhiếp ảnh gia part 60

Dựng phim kỹ thuật số Kết hợp các mũi chích ngừa, hoặc tạo ra "bánh mì kẹp trượt," đã được một kỹ thuật phổ biến phim trong nhiều năm. Theo truyền thống, một trong những slide đã có được nếu dùng quá lâu bởi khoảng hai điểm dừng và các khác bởi dừng duy nhất để mang lại một tiếp xúc chấp nhận được. Hiện hay nhất, nó là một cách tiếp cận đó đòi hỏi rất nhiều thử và sai và bracketing. | Try It Open the image called FilterGallery from this book s companion website .com go photoshopnature or open one of your own images and experiment with a variety of filters. Try different combinations and orders of filters while varying the settings. 372 CHAPTER 9 CREATIVE EFFECTS Digital Montages Combining shots or creating slide sandwiches has been a popular film technique for years. Traditionally one slide had to be overexposed by about two stops and the other by a single stop to yield an acceptable exposure. At best it s an approach that requires a lot of trial and error and bracketing. It s not only possible to emulate these same effects in Photoshop it s actually easier to do so One reason is that we have the flexibility to alter exposures as needed. Another reason is that if you didn t think of using a particular image as part of a montage while you were in the field it doesn t matter. You can make several versions of the same file in Photoshop. And in Photoshop you can go further and combine numerous images in a variety of ways. Before you begin to make your montages remove any dust in your images. After all double the dust means double the cleanup required later Final exposure and color changes are usually best made after creating the montage. Blending Modes Before proceeding with ways to combine images you need to have some understanding of blending modes. Back in Chapter 5 you learned about layers. Recall that in many ways pixel layers in Normal blending mode which is what we ve been using act like prints. Whatever is on top is what you see. If you cut a hole in the top layer by using a layer mask to partially hide that layer you see what s underneath. If you reduce the opacity of the top pixel layer you see some of the top layer and some of the layer beneath it. In Normal mode the layers blend together in an intuitive way. However Photoshop at its core is a series of mathematical algorithms and there are other instructions algorithms for how