chúng tôi sẽ sửa chữa một bức ảnh được chụp với độ phân giải thấp máy ảnh kỹ thuật số trong trường hợp này, Kodak DC50. Thông thường các máy ảnh tạo ra kết quả tuyệt vời, nhưng họ có một thiếu sót có thể được sửa chữa kỹ thuật số bằng cách sử dụng lớp. Kỹ thuật này cũng khá hữu ích cho sửa chữa IMAG xấu quét | Repairing Adobe Senior Creative Director Russell Brown shows you how to repair your digital images with Adobe Photoshop Adobe ADVANCED In this demo we will repair a photograph taken with a low-resolution digital camera in this case the Kodak DC50. Often these cameras produce excellent results but they have a few deficiencies that can be repaired digitally using layers. This technique is also quite useful for repairing badly scanned images. REPAIRING DIGITAL PHOTOGRAPHS PART 1 1. Open your digital image file in Photoshop. Zoom in on the image and take a close look at the problem areas especially noting the skin tone in this image. 2. Go through the RGB channels. Press Command Ctrl 1 for the Red channel Command Ctrl 2 for the Green and Command Ctrl 3 for the Blue channel. Notice the artifacting and extra noise in the Blue channel. The Blue channel is the telltale channel of a scanned image and often will show the errors of the scan. 3. Zoom out of the image and return to the RGB composite. Here s how to easily fix this image using Photoshop layers. Duplicate the Base Layer by dragging it onto the New Layer icon at the bottom of the Layers palette. Double-click this new layer and rename it Color Blur. Preferences For this demo we chose Preferences Display Cursors and selected. Brush Size and Precise. Blue channel The CCD Charged Couple Device in the camera is least sensitive to the blues and it is more difficult to interpret those colors. Also when you capture an image with a digital camera it s compressed with JPEG compression. The combination of these two factors creates noise in the blue channel. Shortcuts Throughtout this document Command Ctrl means Command on the Macintosh and Ctrl on Windows . Option Alt means Option on the Macintosh and Alt on Windows. 2 REPAIRING DIGITAL PHOTOGRAPHS PART 1 4. Choose Filter Blur Gaussian Blur. Choose values based on the resolution of the image. You want to soften the image not lose the image completely but soften it especially
