The Use of Logarithmic and Density Units for Pixels

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: The use of logarithmic representation for pixel data may provide maximum flexibility in several areas. The logarithmic representation seems to be an optimum coding for digital brightness representation and also allows easy conversion to and from the linear brightness domain, which is necessary for proper spatial filtering. The ability to provide latitude by simply “sliding” up and down the logarithmic curve can also provide the crucial capability to print-up or print-down or color-correct scenes after initial capture. Density units are a natural analogy to logarithmic units for digital input scanning of motion-picture film. The film itself, however, will have introduced a toe and shoulder to the dark and light parts of the image. The natural relationship between film density and logarithmic units, as well as the ability to provide latitude and correction capabilities, makes the logarithmic pixel representation a significant candidate for high-definition television (HDTV) and computer graphics.
Publication Date: 1991-10-01
DOI: 10.5594/J02429
Link: https://doi.org/10.5594/J02429
Author(s): Gary Demos

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Gary Demos; The Use of Logarithmic and Density Units for Pixels, SMPTE Journal ( Volume: 100, Issue: 10, October 1991); SMPTE, 1991. Available at https://doi.org/10.5594/J02429

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Gary Demos; The Use of Logarithmic and Density Units for Pixels, SMPTE Journal ( Volume: 100, Issue: 10, October 1991); SMPTE, 1991. Available at https://doi.org/10.5594/J02429

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Gary Demos; The Use of Logarithmic and Density Units for Pixels, SMPTE Journal ( Volume: 100, Issue: 10, October 1991); SMPTE, 1991. Available at https://doi.org/10.5594/J02429

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<span class="citation">Gary Demos; <cite>The Use of Logarithmic and Density Units for Pixels</cite>, SMPTE Journal ( Volume: 100, Issue: 10, October 1991); SMPTE, 1991. Available at <a href="https://doi.org/10.5594/J02429" target="_blank" rel="noopener">https://doi.org/10.5594/J02429</a></span>

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Gary Demos; The Use of Logarithmic and Density Units for Pixels, SMPTE Journal ( Volume: 100, Issue: 10, October 1991); SMPTE, 1991
doi: 10.5594/J02429
url: https://doi.org/10.5594/J02429

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Gary Demos; <cite id="bib-10-5594-j02429">The Use of Logarithmic and Density Units for Pixels</cite>, SMPTE Journal ( Volume: 100, Issue: 10, October 1991); SMPTE, 1991
<span class="doi">10.5594/J02429</span>
</li>