摘要:
A system and method are disclosed for an image processing system including a threaded scheduler providing compact and efficient dataflow as a pipeline management and data flow layer.
摘要:
Methods and systems of assessing color gamut requirements for a print job and a printing device are disclosed. A print job including one or more input color spaces may be received. A computing device may produce a color transformation for each input color space using at least a color gamut error profile. The computing device may further produce result information based on the one or more color transformations. Result information may be provided to a user.
摘要:
A method for correcting a white line artifact between low and high frequency printed pixels. A printer may be able to print either a high or low frequency halftone pixels in some locations, but may be able to print only high frequency halftone pixels in other locations, the latter known as out of phase locations. If the image data is in run length encoded form, and the printer tries to print a low frequency pixel in an out of phase location, no pixel will be printed in that location and a white space results. The remedy is to test at the beginning and end of low frequency runs bordering high frequency runs. If the first (last) low frequency pixel of an original run is in an out of phase location, a one pixel run of the high frequency screen and of the low frequency color is added before (after) the original run, and the run length of the low frequency run is decreased by one pixel.
摘要:
Systems and methods are described that facilitate identifying objects in a document (e.g., a PDF document) for automatic image enhancement (AIE). A PDF document is “chunked” or segmented into chunks, and boundaries between chunks are identified as real or imaginary. Chunks sharing imaginary boundaries are combined, while real boundaries are retained, to generate “de-chunked” objects. These objects are then classified, and an AIE application is executed on objects meeting pre-specified classification criteria. In this manner, objects of r which AIE is not desired are not subjected to the AIE application, thereby saving time and processing resources associated with enhancing the document.
摘要:
A system/method of color match assessment for electronic documents includes receiving digital data defining a composite electronic document including a raster image object having an edge and a color graphics object bordering the edge of the raster image object. The pixel color values defining the edge of the raster image object are processed to estimate a local color variance of the pixel color values. The local color variance is used to determine if the edge can be color matched to the bordering color graphics object. If the edge can be color matched, a match color for the edge is derived. The match color is associated with the digital data defining the electronic document so that a downstream object color match system can use the match color as needed, e.g., to adjust the color of the bordering color graphics object to ensure a match with the edge of the raster image object when the electronic document is printed using a xerographic printing process.
摘要:
A method for remote proofing a digital press by performing the color rendering of a specific DFE and printer, including taking into account job and printer settings, while maintaining vector objects is described. In one exemplary embodiment, the method color renders a file to a PDF/X-1 format to enable a portable proof-ready file, independent of the target print system. The PDF/X-1a's output intent tag identifies the intended print condition within the file. The rendered PDF/X-1a file can be sent to any device that supports the PDF/X standard and automatically convert colors from the output intent color space to the proofer color space for an accurate hard copy proof. This functionality automates and streamlines the proofing task of the end user because there is no need to find and load the correct ICC profile on the proofing system.
摘要:
This invention is a method of producing a set of TRC's for a color printer's secondary halftone screens that is correlated with the printer's primary halftone screens. The method makes use of the printer/screen characteristic data that is normally gathered during screen calibration. However, instead of progressing from the data to a normal calibration for the secondary screens, the method goes backward through the data starting with the finished primary screen TRC's. The method insures that for every primary screen density, the closest possible secondary screen density is used when the same digital value is specified.
摘要:
Methods and systems of assessing color gamut requirements for a print job and a printing device are disclosed. A print job including one or more input color spaces may be received. A computing device may produce a color transformation for each input color space using at least a color gamut error profile. The computing device may further produce result information based on the one or more color transformations. Result information may be provided to a user.
摘要:
A method for color cast removal in a scanned image in L*a*b* space includes generating a first color cast correction curve for mapping L* to a first color correction, Δa*, (or Δb*) wherein the first correction curve provides a desired a* shift in midtone regions and is modulated as a function of L* such that black and white points are unaffected; for each pixel n in the scanned image, passing L*n through the first color cast correction curve for obtaining a value of Δa*n; and adding the value of Δa*n to the scanned image's original a*n component. To ensure that the color corrected a* remains within gamut, a second correction curve for applying a clipping factor to the mapped Δa* may be generated with the a*n passing through the second correction curve for obtaining a clipping factor Cn; and modifying the a*n value by Cn(Δa*n).
摘要翻译:一种用于在L * a * b *空间中的扫描图像中去色调的方法包括:生成用于将L *映射到第一颜色校正的Deltaa *(或Deltab *)的第一色偏校正曲线,其中第一校正曲线 中间色调区域中所需的*移位,并且被调制为L *的函数,使得黑色和白色点不受影响; 对于扫描图像中的每个像素n,通过第一颜色转换校正曲线的L * SUB>以获得Deltaa * N n的值; 并将Deltaa * N SUB>的值添加到扫描图像的原始a * SUB>分量。 为了确保校正的颜色a *保持在色域内,可以通过经过第二校正曲线的a * N n生成用于将削波因子应用于映射的Deltaa *的第二校正曲线,以获得 剪切因子C SUB> 并且通过C n n n(ΔΔ* N n)修改a * N SUB>值。
摘要:
A method and apparatus for compressing and decompressing electronic documents, with maximum intradocument independence, and maximum flexibility in optimization of compression modes. The method includes receiving documents containing unknown combinations of a plural data types, including combinations of scanned data, computer rendered data, compressed data and/or rendering tags; dividing the received image into strips of blocks determining from the image itself, which data types are present in each block; compressing data of each data type present in each block with a compression method optimized for its data type. Scanned data may be further segmented into plural scanned data types, where each data type is compressed in said compressing data step with a compression method optimized for said scanned image data type. If the received data type is compressed data, the process may include the additional functions of determining a compression ratio thereof, and accepting the compressed data for use as, or decompressing and recompressing the data, based on acceptability of said compression ration determination. An instruction set is generated that allows detailed decompression instruction data and image data to be combined with transmitted compressed data. A data structure is shown, which segregates data types and instruction data, and allows for block to block and strip to strip processing independence.