Basic Photographic Materials and Processes by Nanette L. Salvaggio

By Nanette L. Salvaggio

On the way to strengthen your creative talents to the simplest of your skill, you first needs to comprehend the technological know-how and the basics of images. even if you're a scholar of images or a pro expert, this completely up to date version of the vintage textual content easy Photographic fabrics and strategies will supply all the medical details that you simply desire. complete colour all through for the 1st time, this 3rd version covers new subject matters together with electronic answer, electronic sensor expertise, scanner expertise, colour administration, and tone copy.

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Reflecting surfaces only C. both light sources and reflecting surfaces 15. When the luminance of a surface of uniform tone is measured with a spot exposure meter, the luminance will vary . . A. directly with the meter to surface distance B. inversely with the meter to surface distance C. directly with the meter to surface distance squared D. inversely with the meter to surface distance squared E. none of the above 35 This page intentionally left blank chapter 2 Camera and Printing Exposure Photograph by David Kelbe, Imaging Science Student, Rochester Institute of Technology Camera Exposure Versus Photographic Exposure Although the terms camera exposure and photographic exposure are related, they are not the same.

Luminance is the photometric quantity that relates closely to the perceptual concept of brightness. The term brightness is used exclusively to describe the appearance of a source and, therefore, cannot be directly measured. Generally, as the luminance of a source increases, so does the brightness of that source. If two 60-watt tungsten lamps are placed side by side, and one lamp is frosted while the other is clear, the clear lamp looks much brighter than the frosted lamp. If both bulbs are consuming the same amount of electrical energy and they both are using a tungsten filament, the intensities of the two lamps would be the same.

2 4. 057 C/m2 Luminance to Illuminance Illuminance ϭ luminance/reflectance 1. 56 footcandles 2. 56 metercandles 3. 45 footcandles 4. 45 metercandles Notes: 1. A perfectly diffusely reflecting surface (100 percent) illuminated by 1 footcandle (1 lumen per square foot) will reflect 1 footlambert (1 lumen per square foot or 1/π candela per square foot). 2. Metric: A perfectly diffusely reflecting surface (100 percent) illuminated by 1 metercandle (1 lumen per square meter or 1 lux) will reflect 1 apostilb (1 lumen per square meter or 1/π candela per square meter).

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