TAILIEUCHUNG - Photoshop cs5 cho nhiếp ảnh gia part 52

Mở rộng Độ sâu của trường nhiếp ảnh gia Thiên nhiên đôi khi gặp phải tình huống mà chúng tôi muốn tối đa hóa độ sâu của chúng ta về lĩnh vực (dải, tập trung mạnh rõ ràng trong một hình ảnh) nhưng chúng tôi gặp phải những hạn chế kỹ thuật. | 320 CHAPTER 8 COMPOSITES Try It Open the images from go photoshopnature called HDR1 HDR2 and HDR3 and experiment with creating a 32-bit file and then converting it back to a 16-bit file. Extending the Depth of Field Nature photographers sometimes encounter situations where we want to maximize our depth of field the range of apparently sharp focus within an image but we encounter technical limitations. Perhaps the range we want to be in focus is too great for the lens or the wind is blowing so we have to use a relatively fast shutter speed to freeze the motion. Using the faster shutter speed may mean we can t use as small an aperture as we d like for a correct exposure without resorting to higher ISOs which can lead to problems with noise. The solution is to take several shots with limited but different areas in focus and then combine them. Although you could opt to manually combine images by layering them and using layer masks both Photoshop and Elements offer tools to automatically select the sharpest areas from each image and combine them into a single image. We ll cover the Photoshop method first since it differs significantly from the Elements method. In Photoshop CS5 we ll take advantage of a script to load the images into a sinPhotoshop ONLY gle file and then have Photoshop automatically create the sharpest image possible by using advanced blending algorithms to choose the sharpest areas in a series of images and composite them automatically. It s really quite impressive To use this function first take a series of shots with your camera on a tripod. Vary only the focus point. Begin at one extreme and slowly move the focus point back until the last area you want to be in focus is sharp. The more perfectly your images are aligned with no subject or camera movement the better this method will work. Use your depth-of-field preview button if you have one to see what areas will be in focus and allow for overlap between the shots. Be careful

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