Color conversion apparatus, look-up table generating method, and look-up table generating apparatus

    公开(公告)号:US09965708B2

    公开(公告)日:2018-05-08

    申请号:US15614978

    申请日:2017-06-06

    发明人: Yoshio Okumura

    IPC分类号: G06K15/02 H04N1/60

    摘要: A look-up table generating method generates a look-up table by synthesizing at least first and second look-up tables to indicate first and second output characteristics for first and second region. The first output characteristic includes an output characteristic in which a first color difference between color values of the first and second color materials under a first observation light source is within a first range for all of the first region, and a second color difference between color values of the first and second color materials under a second observation light source is outside a second range for at least part of the first region. The second output characteristic includes an output characteristic in which the first color difference is outside the first range for at least part of the second region, and the second color difference is within the second range for all of the second region.

    Method for generating PDF trapping objects without knowing the description of the contours

    公开(公告)号:US09609175B2

    公开(公告)日:2017-03-28

    申请号:US14943563

    申请日:2015-11-17

    发明人: Frank Gnutzmann

    IPC分类号: H04N1/58 G06K15/02

    摘要: A method for creating PDF trapping objects from a PDF page description without a known contour description by using a computer for a printing process includes using the computer to generate a colored tiling pattern out of a part of the PDF page description without the top object to be choked, using the computer for clipping with a mask of the background object, using the computer for clipping with the top object or text to limit following frame additions to the top object, using the computer for adding a frame to the top object, using the generated colored tiling pattern as an inner frame between the background object and the top object, using the computer for adding a frame to the top object while activating overprinting of the background in the required object colors and using the computer for inserting the trapped top object into the PDF page description.