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Pictorial Photography; Its Principles and Practice

Pictorial Photography; Its Principles and Practice

          
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About the Book

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: CHAPTER III PLATES?FILMS?RAY-FILTERS The Spectrum.?It has already been explained that white light consists of ether vibrations of different wave lengths, the visible portion of the spectrum consisting of wave lengths from 4000 to 7000 A. U. In addition, there are known to exist waves of much less and much greater wave length, the former being known as ultraviolet and the latter as infra-red. The infra-red rays manifest themselves as heat and as Hertzian waves, and are of no great importance in photography, whereas the ultra-violet have a marked chemical (photographic) action, and are extremely important. If a beam of white light be analyzed by means of a diffraction grating it will appear as an elongated band of different colors, as shown in Figure 30, where the numbers indicate the wave lengths. Visual Luminosity.?It will be found that the visual luminosity, that is, the intensity to the eye, of these colors varies, the yellow being the most intense, while the effect falls off toward both ends of the spectrum, so that if we plot a curve in which vertical distances represent visual luminosities it will appear as in Figure 31. Ordinary Plate.?Since natural objects appear colored by reason of the fact that they absorb all light except that of a certain wave length (the wave length which gives rise to that particular color sensation) itwill be apparent that if they are to be represented by photography in their correct values, that is, relative luminosities in monochrome, the sensitiveness of the plate to light of the different wave lengths should be the same as that of the eye, but this is very far from being the case, for if the spectrum be photographed on an ordinary (non-orthochromatic) plate and the result plotted, the curve will have the form shown in Figure 5000 ...


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Product Details
  • ISBN-13: 9780217028325
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 72
  • Series Title: English
  • Weight: 145 gr
  • ISBN-10: 0217028322
  • Publisher Date: 11 Jan 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 4 mm
  • Width: 189 mm

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