Showing papers on "Color gradient published in 1982"
Patent•
22 Mar 1982TL;DR: In this article, a system and method allow an artist to blend a desired color from available source (i.e., menu) colors and use the resulting blend color at the desired part of the picture and/or store the blend color for future use as a source color.
Abstract: The disclosed system and method allow an artist to blend a desired color from available source (i.e., menu) colors and use the resulting blend color at the desired part of the picture and/or store the blend color for future use as a source color. A palette mixing area and a menu of colors can be displayed on a video screen. A signal defining a selected source color is generated when the artist touches with a stylus an area on a touch tablet which corresponds to the screen display of the selected color. When the stylus then touches the part of the touch tablet corresponding to a selected part of the palette mixing area on the screen, the screen shows at that selected area a blend of any color preexisting there and the selected color. A signal defining the blend color can be stored for future use as a source color. The proportions of the two colors in a blend can be controlled by stylus pressure, number of overstrokes and/or stylus dwell time.
79 citations
1 Dec 1982
TL;DR: The incorporation of models of the bits-to-luminance transfer function simplified the procedure used to solve for color graphics system bit values and the technique developed need not be limited to use with color CRTs.
Abstract: : A technique for displaying colors of specified chrominance is reviewed. The technique makes use of models of the bits-to-luminance transfer function of the phosphors of a color graphics system CRT. Measurements of the transfer function of a graphics system were made. Second order polynomial models were found to provide a good fit of the bits-to-luminance relationship. A two-part model or spliced fit approach yielded the most accurate predictions of luminance. The algebraic basis of the technique is reviewed as are the limitations of the technique. Example solutions for graphics system inputs yielding colors of specified chrominance are provided. The technique provides a method for control of color mixing and for quantitative specification of colors. The incorporation of models of the bits-to-luminance transfer function simplified the procedure used to solve for color graphics system bit values. The technique developed need not be limited to use with color CRTs. Once the input-to-luminance output relationship of any display has been measured and characterized, and once the color coordinates of the system's primaries are known, the technique for determining system inputs can be applied. The only restriction is that the CIE color coordinates of the display system color mixing primaries must not vary as a function of luminance output. (Author)
3 citations
TL;DR: A method is presented for choosing high-contrast sets of colors for additive color mixers (e.g., CRT) based on data about target-location performance of human observers and adapts the color sets to the gamut of the color processor in use.
Abstract: A method is presented for choosing high-contrast sets of colors for additive color mixers (e.g., CRT). The method is based on data about target-location performance of human observers and adapts the color sets to the gamut of the color processor in use. The method produces any specified number of colors spread as far from each other as possible in color space to maximize contrast. Applications of high-contrast sets of colors are indicated, illustrative results are presented and discussed, and variations of the method are suggested.