Khi bạn chọn Filter ➪ Distort ➪ Displace, Photoshop sẽ hiển thị hộp thoại Displace. (Hiển thị Displace "là tương đương với hiện đại của" Bắt đầu Beguine, "làm không biết) Như thể hiện trong hình A-33, các Displace hộp thoại cung cấp các tùy chọn sau: ✦ Quy mô: Bạn có thể xác định mức độ mà Displace di chuyển bộ lọc màu sắc trong một hình ảnh bằng cách nhập | 26 Extra Reading Photoshop 6 for Windows Bible Figure A-32 Changing the speeds of color transitions in the two-channel displacement map left column created smoother image distortions at both the 10 percent middle and 20 percent right settings. The Displace dialog box When you choose Filter Distort Displace Photoshop displays the Displace dialog box. Displays the Displace is the modern equivalent of Begin the Beguine don t you know. As shown in Figure A-33 the Displace dialog box provides the following options 4- Scale You can specify the degree to which the Displace filter moves colors in an image by entering percentage values into the Horizontal Scale and Vertical Scale option boxes. At 100 percent black and white areas in the dmap each have the effect of moving colors 128 pixels. That s 1 pixel per each brightness value over or under medium gray. You can isolate the effect of a single-channel dmap vertically or horizontally or ignore the first or second channel of a two-channel dmap by entering 0 percent into the Horizontal or Vertical option box respectively. Chapter A Constructing Homemade Effects 27 Figure A-33 Use these options to specify the degree of distortion how the filter matches the displacement map to the image and how it colors the pixels around the perimeter of the selection. Figure A-34 shows the effect of distorting an image exclusively horizontally top row and vertically bottom row at each of three percentage values 5 percent 15 percent and 30 percent. In each case I used the two-channel dmap from Figure A-32. Figure A-34 The results of applying the Distort filter exclusively horizontally top row and exclusively vertically bottom row at 5 percent left column 15 percent middle and 30 percent right . 28 Extra Reading 4 Photoshop 6 for Windows Bible 4- Displacement Map If the dmap contains fewer pixels than the image you can either scale it to match the size of the selected image by selecting the Stretch to Fit radio button or repeat the dmap over .
