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Sử dụng bộ lọc để làm mềm Blur Images Làm mờ được áp dụng hiệu ứng ngược lại với hình ảnh sắc nét không. Thay vì tìm kiếm các cạnh và thêm độ tương phản, làm mờ làm giảm độ tương phản, làm cho cạnh nhẹ nhàng hơn. Photoshop đã có 11 bộ lọc Blur. | Part IV Enhancing Correcting and Retouching FIGURE 14.10 The Smart Sharpen filter allows you to fine-tune the filter to set the amount of sharpening that takes place in the highlights range. Using Blur Filters to Soften Images Blurring applies the opposite effect to images that Sharpening does. Instead of finding edges and adding contrast blurring reduces the contrast making edges softer. Photoshop has 11 Blur filters. Caution Blurring images is done by smoothing out some of the details. The detail is permanently lost. You likely want to apply the blurring filters on a separate duplicate layer to avoid data loss problems. Each Blur filter reduces the contrast at different levels and in different ways. If you choose a Gaussian Blur for example each pixel is compared to pixels around it in an even radius and pixels that are closer receive higher weight than pixels that are farther away. Choosing the Blur filter softens the edges in your image by blurring only those pixels that are in high contrast areas .If you choose a Box Blur each pixel is compared to pixels around it in a box shape giving the end result an edgier appearance. If you really want an interesting result choose a Shape Blur where you can choose from dozens of shapes to use for the pixel comparison. Automatic Blur filters The first three Blur filters on the Filter C Blur menu are automatic Blur filters meaning that they don t require any input from the user. These filters are Average Blur and Blur More. 448 Chapter 14 Sharpness Blur and Noise Adjustments Average Takes the average color of the frame or selected area and fills the entire frame with that color. It s not a great photo enhancer but it could be useful for creating matching backgrounds when placing odd-sized photos in a video file. Blur Automatically smoothes the color transitions in an image to soften the edges. Blur More Works the same as the Blur filter by smoothing the color transitions in an image to soften the edges. The Blur More filter
