Tone reproduction is the rendering of original document densities into luminances on softcopy displays or into densities in hardcopy media. It is the foundation for the evaluation of all other image quality metrics. It determines whether a reproduced image is too dark, too light, and of low contrast or of high, and implicitly assumes the evaluation of neutral gray tones over large areas of an image.
The seductive beauty of a photograph by Ansel Adams or Irving Penn is primarily due not to the image content, composition, sharpness, or low noise but rather to the remarkable reproduction of tones-from gleaming highlights to deep-shadow details, with all tones in between. Tone reproduction is the welcome mat to the evaluation of all other image quality metrics. Although on the surface, tone reproduction seems a simple job of tone management, the subtleties of the viewing environment and cultural and professional preferences often make it an art.
For scanned image files, tone reproduction is somewhat of a misnomer unless a final viewing device is assumed. This is because the capture process in a scanner is simply that-a capture step. It is not a display that reproduces light. Tone reproduction, by contrast, requires both capture and display. How then does one select a scanner to accommodate the best possible tone reproduction when the scanned data generally may be reproduced on any number of display types and for a number of viewing preferences?
Tone reproduction is the rendering of original document densities into luminances on softcopy displays or into densities in hardcopy media. It is the foundation for the evaluation of all other image quality metrics. It determines whether a reproduced image is too dark, too light, and of low contrast or of high, and implicitly assumes the evaluation of neutral gray tones over large areas of an image.The seductive beauty of a photograph by Ansel Adams or Irving Penn is primarily due not to the image content, composition, sharpness, or low noise but rather to the remarkable reproduction of tones-from gleaming highlights to deep-shadow details, with all tones in between. Tone reproduction is the welcome mat to the evaluation of all other image quality metrics. Although on the surface, tone reproduction seems a simple job of tone management, the subtleties of the viewing environment and cultural and professional preferences often make it an art.For scanned image files, tone reproduction is somewhat of a misnomer unless a final viewing device is assumed. This is because the capture process in a scanner is simply that-a capture step. It is not a display that reproduces light. Tone reproduction, by contrast, requires both capture and display. How then does one select a scanner to accommodate the best possible tone reproduction when the scanned data generally may be reproduced on any number of display types and for a number of viewing preferences?
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