Giảm tiếng ồn lọc thay thế khác để giảm tiếng ồn trong Camera Raw là sử dụng các bộ lọc tiếng ồn giảm, được tìm thấy trong menu ồn Lọc ➯ trong Photoshop. Bộ lọc này sử dụng một phương pháp giảm tiếng ồn thông minh có thể loại bỏ tiếng ồn từ một hình ảnh, nhưng mà không phá hủy các chi tiết cạnh trong hình. | Martin Evening Adobe Photoshop CS4 for Photographers Reduce Noise filter The other alternative to noise reduction in Camera Raw is to use the Reduce Noise filter which is found in the Filter o Noise menu in Photoshop. This filter uses a method of smart noise reduction that can remove noise from an image but without destroying the edge detail in the picture. Overall the Reduce Noise filter is a useful one shot filter that is better at reducing the noise in images that originated as digital captures rather than reducing film grain noise from scanned 35mm images. This filter is mainly designed to target the twin problems of digital luminance noise which is like a very fine speckly grain and color noise Reduce Noise Figure Here is the Reduce Noise filter being used to help remove the noise from a digital capture which was shot at 1250 ISO where the Reduce Noise filter helped get rid of most of the noise artifacts. 258 Chapter 4 Sharpening and noise reduction which is commonplace with digital captures shot at high ISO settings. The only problem with this filter is that it is quite memory-intensive so be prepared for a wait while it performs its calculations. Although it can appear quite effective at removing heavy noise if you do have to apply extreme settings you can sometimes end up with an enhanced noise pattern instead. In Basic mode you can simply adjust the strength of the noise reduction and then use the controls below that to modify the noise filtering these should be adjusted in the order they are displayed. The Strength slider adjusts the amount of noise reduction that is applied while the Preserve Details slider helps preserve the edge luminance information. The luminance noise reduction will appear strongest when you set Preserve Details to zero but as you increase Preserve Details more edge detail and often more noise will become visible. Below that is the Reduce Color Noise slider which allows you to separately control the color noise suppression. .
