摘要:
Methods and systems herein provide for the color conversion of image data with various levels of gray values, such as text. Such color conversion includes generating a CMYK conversion model by defining a gray region in the perceptual color space of the image data to convert the gray values of the gray region to a range of K values during CMYK color conversion of the image data and segmenting chroma values in a color lookup table that maps perceptual color values to CMYK color values. Lightness values in the color lookup table are adjusted using a perceptual model (e.g., a Heimholtz-Kohlrausch Effect model) based on the segmented chroma values to substantially maintain a lightness relationship between the gray values of the image data and the remaining color values of the image data. The image data is the converted to a CMYK color space using the generated CMYK conversion model.
摘要:
Methods and systems herein provide for the color conversion of image data. Such color conversion includes receiving the image data from an input imaging device and generating a CMYK to CIELab model for conversion of the image data to a color gamut of an output imaging device. From there, a table of CMYK color values and corresponding CIELab color values is generated based on the model. The color conversion then includes mapping the CIELab color values of the image data to a CIELab color gamut of the output imaging device such as a printer. The color conversion also includes comparing the mapped CIELab color values to the CIELab color values of the table to retrieve corresponding CMYK color values and processing the retrieved CMYK color values (e.g., via multidimensional optimization) to convert the CIELab color values of the image data to the CIELab color values of the output imaging device.
摘要:
Methods and systems herein provide for color conversion of image data to another color space, such as that of a printer. Such color conversion includes linearly processing the color conversions when using radial basis functions for the conversions. One color conversion system herein includes a modeling module operable to generate a numerical model according to a radial basis function for converting the color values in the image data to the color space. The numerical model includes error approximations operable to form the radial basis function into a linear process. The system also includes a color converter operable to convert the color values in the image data to the color space based on the numerical model.
摘要:
Systems and methods for color conversion from one CMYK color space to another CMYK color space. The system receives a color defined by a first coordinate in the first CMYK color space. The system converts the color to a second coordinate for the second CMYK color space, and determines a location in a perceptual color space for each of the first coordinate and the second coordinate. The system further identifies a distance between the locations in the perceptual color space, and reduces the distance in the perceptual color space between the two locations by iteratively revising the second coordinate in the second CMYK color space while holding the black level of the second coordinate constant.
摘要:
A chromium-iron alloy comprises in weight %, 1 to 3% C, 1 to 3% Si, up to 3% Ni, 25 to 35% Cr, 1.5 to 3% Mo, up to 2% W, 2.0 to 4.0% Nb, up to 3.0% V, up to 3.0% Ta, up to 1.2% B, up to 1% Mn and 43 to 64% Fe. In a preferred embodiment, the chromium-iron alloy comprises in weight %, 1.5 to 2.3% C, 1.6 to 2.3% Si, 0.2 to 2.2% Ni, 27 to 34% Cr, 1.7 to 2.5% Mo, 0.04 to 2% W, 2.2 to 3.6% Nb, up to 1% V, up to 3.0% Ta, up to 0.7% B, 0.1 to 0.6% Mn and 43 to 64% Fe. The chromium-iron alloy is useful for valve seat inserts for internal combustion engines such as diesel or natural gas engines.
摘要:
Methods and systems herein provide for CMYK color conversion of input image data while preserving K color values during the conversion process. A color management module is operable to convert input image data from one color space to a CMYK color space. For example, the color management module may convert the image data of one device operating in a CMYK color space to a CMYK color space of another device. In doing so, the color management module preserves or maintains the K color values of the input image data during the CMYK to CMYK color conversion. The color management module may implement such by modifying input and output ICC profiles and interpolating the perceptual lightness values of the input ICC profile within the output lookup table.
摘要:
A cobalt-rich wear resistant and corrosion resistant alloy comprises in weight %, 0.5 to 1.2% C, 0.6 to 2.1% Si, 17 to 24% Cr, 27 to 38.5% Fe, 1.4 to 20% W, 3.8 to 9.7% Mo, less than 1% Ni and balance Co. A preferred cobalt-rich alloy comprises in weight %, 0.5 to 0.9 C, 0.75 to 1.15% Si, 17.5 to 20.5 Cr, 27.0 to 32.0 Fe, 12.5 to 16.5 W, 6.25 to 8.25 Mo, 0.45 to 1.00 Ni and balance Co. The alloy preferably has a microstructure free of primary carbides and comprises up to about 50% by volume eutectic reaction phases in a solid solution matrix. The solid solution matrix is an αFe-αCo face-centered cubic solution with W, Cr and Mo as solute elements and the eutectic reaction products comprise a (Co,Cr)7(W,Mo)6 phase and an αFe-αCo phase. The alloy is useful as a valve seat insert for internal combustion engines such as diesel engines.
摘要:
Methods and systems herein provide for color conversion. Such color conversion includes gamut mapping by determining a color gamut of an imaging device and receiving color data having color values external to the color gamut of the imaging device. The gamut mapping proceeds by determining a color region external to the color gamut and mapping the color values within the color region to the color gamut. Thereafter, the area of the color region is increased and the color values within the increased color region are mapped to the color gamut.
摘要:
A cobalt-rich wear resistant and corrosion resistant alloy comprises in weight %, 0.5 to 1.2% C, 0.6 to 2.1% Si, 17 to 24% Cr, 27 to 38.5% Fe, 1.4 to 20% W, 3.8 to 9.7% Mo, less than 1% Ni and balance Co. A preferred cobalt-rich alloy comprises in weight %, 0.5 to 0.9 C, 0.75 to 1.15% Si, 17.5 to 20.5 Cr, 27.0 to 32.0 Fe, 12.5 to 16.5 W, 6.25 to 8.25 Mo, 0.45 to 1.00 Ni and balance Co. The alloy preferably has a microstructure free of primary carbides and comprises up to about 50% by volume eutectic reaction phases in a solid solution matrix. The solid solution matrix is an αFe-αCo face-centered cubic solution with W, Cr and Mo as solute elements and the eutectic reaction products comprise a (Co, Cr)7(W,Mo)6 phase and an αFe-αCo phase. The alloy is useful as a valve seat insert for internal combustion engines such as diesel engines.
摘要:
A halftone threshold matrix includes a plurality of submatrices, wherein a first group of the plurality of submatrices has a line screen frequency different from a second group of the plurality of submatrices. The halftone method and apparatus removes the restriction that at most one pel is turned on per basic cell for the next constant input level and allows the pels in some basic cells to be turned on much sooner that the corresponding positions in other basic cells. This creates a dominant low frequency line screen simultaneously with the higher frequency line screen of the other basic cells. The present invention also allows the basic cells inside the threshold matrix to have different shapes and sizes. Thus, the cells participating in the low frequency screen could be larger than the cells generating the higher frequency screen. for example, the low frequency screen's pleasing patterns can distract the eye from noticing less pleasing patterns in the high frequency grid and vice versa.