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Recognition Thresholds For The Spectrally Opponent Neural Network In The Human Visual System, Douglas Smith
Recognition Thresholds For The Spectrally Opponent Neural Network In The Human Visual System, Douglas Smith
Theses
Recognition thresholds for an alphanumeric resolution test object of differing target/background chromaticities and equal luminosities were determined. Combinations of the four psychologically unique hues were studied, and those pairs corresponding to the green-red and yellow-blue opponent neural systems were found to give the highest visibilities. Equivalent achromatic contrasts for each of the presented color pairs were determined, and comparison of the results with achromatic data of other researchers shows clearly that the spectrally opponent neural network in the human visual system is much less efficient in processing spatial information than is the spatially opponent (achromatic) neural network.
An Approach To Tone Reproduction For Converting Transparencies To Reflection Prints, Mark Mccormick-Goodhart, Andrew Macica
An Approach To Tone Reproduction For Converting Transparencies To Reflection Prints, Mark Mccormick-Goodhart, Andrew Macica
Theses
The purpose of this investigation was to study the useful criteria for converting transparencies to reflection prints, and examine the unavoidable departures from the criteria. A single useful criterion was found; that the relative brightness of the reproduction match those of the original. One significant compromise appeared to be in the shadow reproduction in low maximum density reflection prints. It was found that like reflection prints, transparencies do not typically reach relative brightnesses as low as zero. Thus, only a relatively small departure from the 1:1 criterion was likely . Flare in the camera system and viewing conditions limits the …