User manual CANON DIGITAL PHOTO GUIDEBOOK

[. . . ] $19. 95 0055W589 01/06 ©2006 CANON U. S. A. , INC. PRINTED IN U. S. A. Contents The purpose of this guidebook . 2 Switch to Digital Photography Professional digital photography-- . 18 hitting its stride at last Equipment Essential equipment . [. . . ] Gamma does not affect the size or shape of the gamut. It does affect the distribution of RGB points within the gamut. Gamma values refer to the gradation curves used to represent the mid-tone brightness of the display. Gamma selection determines the relationship between light and dark values, similar to contrast. The higher the gamma number, the darker the mid-tones appear on screen and the more contrast you will see. White point is the color temperature of the display, measured in Kelvin temperature. The challenge is that printed materials and photographs will be viewed under many light conditions. Viewing conditions can be built into custom profiles for Gallery lighting, store displays. . . a color specialist should be consulted when this is a client requirement. Understanding measurement devices Densitometer ­ An instrument that measures the density of ink on paper (the absorption of light), not color values. Colorimeter ­ An instrument that measures the color value of a sample, using color filters. A colorimeter can determine if two colors are the same, but it does not take into account the light under which a sample is measured. For monitors, a colorimeter is used to measure the brightness, contrast, and white point (color temperature). A colorimeter generally uses three internal filters to simulate human vision. The measurements are calculated by the profiling software to create a new profile. Spectrophotometer ­ An instrument that measures the wavelength of color across an entire spectrum of colors (measures spectral data). It is similar to a colorimeter but more precise because it measures discrete wavelengths of transmitted light measured in nanometers (1 billionth of a meter). characterization When implementing color management, you often encounter the terms calibration and characterization, which can be confusing, but the difference is really quite simple: calibration changes a device to a standard or known state, while characterization is the process of measuring the characteristics of the device using one of the above listed tools and creating a profile. Calibration steps for Mac OS X If you have a CRT-type monitor, wait for the colors to stabilize. This takes about 30 minutes from the time the monitor is turned on. Once the colors have stabilized, select System Preferences and click Displays, Color, and Calibrate. This will start the Display Calibrator Assistant, which will then interactively guide you through the following steps. Step 1 Adjust the brightness and contrast controls on your monitor as described. [. . . ] Generally, the larger the RAM is, the faster will be the processing of simultaneous tasks. RAW (data) P. 18, 39 Output data from an imaging device that has not been processed in a digital camera. To use RAW images, the data must be processed after capture with dedicated software so that it can be adjusted without corrupting an image. RGB (data) P. 22 Acronym for color image data consisting of the colors red, green, and blue generated by emitted light (monitors or LCDs) rather than absorbed light, as with printed ink in CMYK. N Network P. 26 A structure like a LAN or the internet through which multiple computers communicate, send and receive data. P Perspective P. 42 Spatial relationship between foreground objects and background objects. [. . . ]