商品簡介
Perhaps as the missing guide for camera and photography enthusiasts, this book illuminates on salient features of digital photography, without shying away from the technical explanations, that most photographers are unaware of or remain bewildered about. An example is that cameras with sensor sizes differing by a factor of three or four can have the same size resolution. The advantages of larger sensors -- usually found in larger and more expensive cameras -- are elucidated. Another example that could be puzzling is about smaller lens apertures that increase the camera depth of focus.The book expounds on details of procedures that must be followed to obtain true color images. For example, CMOS (complementary metal oxide semiconductor) sensors are equipped with color filters such that the intensity of the red, green and blue colors are recorded separately. Since the colors must be combined for displays, the colors recorded in the camera are merged. This interesting process known as demosaicing is vividly explained. In fact, the technology for defining colors is a separate issue that is treated in this book.Readers will learn that both our vision and computer displays respond in a nonlinear fashion that requires an operation known as gamma mapping to be built into all monitors. Finally, camera and photography enthusiasts will benefit in learning that an anti-aliasing filter, built into most consumer cameras, smears the resolution of images.
