TAILIEUCHUNG - Photoshop cs5 cho nhiếp ảnh gia part 3

Hiểu Histograms Nếu không có một một trong những nghi ngờ trong những lợi thế quan trọng nhất của chụp kỹ thuật số là khả năng kiểm tra các biểu đồ để đảm bảo bạn đang phơi bày hình ảnh của bạn một cách chính xác. | 10 CHAPTER 1 THINKING DIGITALLY applied to your image at the moment of capture. Any changes even if they re done using the ACR interface will result in some destruction of pixels and therefore image degradation. In reality this may often be so slight that it s not noticeable but it s there. And sometimes the differences may be huge. For example if you accidentally use the wrong white balance a JPEG image may be nearly useless at first and at best may require extensive corrections in Photoshop. But the extent of the exposure corrections you ll be able to make will be less because you ll have only an 8-bit image to work with and extensive Photoshop corrections may result in posterization or noise. Furthermore as discussed earlier a JPEG file is compressed lossy which means that even when you first open it on your computer it has already thrown away some information the sensor captured when you took the picture. Sometimes this is not noticeable but at other times it can result in banding and other strange artifacts. Which is right for you JPEG or RAW For most serious amateur and professional photographers RAW is the way to go. It offers more flexibility and forgivability while simultaneously enabling the highest quality of output. If you make large prints and want the best images you can get RAW is without a doubt the way to go. If limited storage space is your main priority and if you primarily post your images on the Web email them to friends and make only an occasional tiny print then JPEG may be for you. If you plan on selling your images or entering contests check with your intended clients or the contest rules because some will require you to provide the original raw file as well as the converted image. Try It Shoot a series of images in RAW and in JPEG. Expose them to the best of your ability in JPEG and then use the same settings for the raw version or use RAW JPEG if your camera has that option. Then shoot one set with an incorrect white-balance setting. .

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