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Capturing Digital Color: Understanding Filters and Scanners

Discover how filters and scanners control the colors recorded by digital cameras and learn about the importance of capturing high-quality images for successful color reproduction.

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Capturing Digital Color: Understanding Filters and Scanners

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  1. Chapter II, Digital Color Theory: Lesson III Capturing Digital Color http://www.kodak.com/country/US/en/digital/dlc/book3/chapter2/digColorM3_1.shtml

  2. As explained in Module 2, filters control colors recorded by digital cameras and scanners.

  3. Digital images are captured by sensors, usually CCD's: charge-coupled devices. Photosensitive pixels within these sensors respond to light, and their response is recorded digitally

  4. Filters control the wavelengths of light recorded. In some sensors, individual pixels are coated with color filters.

  5. Some digital cameras use multiple CCDs to capture red, green and blue values.Color values captured by a digital camera can be displayed directly on a computer monitor.

  6. Color images captured on photographic film or paper can be digitized by an electronic scanner.

  7. High-quality scanners use photomultiplier tubes to digitize images on a rotating drum. One scan line is recorded with each revolution of the drum. Drum scanners are designed for graphic arts applications, so they convert color to CMYK values used in printing.Other scanners capture color as RGB values.

  8. Scanning is a critical stage in color reproduction. It's difficult or impossible to produce high quality results from a poor quality scan.

  9. Software makes it easy to adjust scanners. But the operator must know which adjustments to make, based on an evaluation of each image that's scanned.

  10. Gamma correction affects the reproduction of tones and colors. It affects brightness and contrast in the midtones without changing highlights and shadows. Gamma can be set for each color individually, or for all colors.

  11. Other scanner adjustments include color balance, brightness, contrast and exposure.Brightness and contrast should be adjusted during scanning. They can be adjusted during later stages as well, but it will be impossible to recapture information lost in the scan.

  12. For most scans, the goal is to capture detail and color throughout the tonal scale from shadow areas ... through midtones ... to highlights

  13. Capturing quality images will put you on the path to a successful color reproduction.

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