【作者】 朱海侠；

【导师】 胡涛；

【作者基本信息】 西安理工大学 ， 信号与信息处理， 2007， 硕士

【摘要】 色彩管理是实现跨设备高质量颜色再现的重要途径。在不同的设备之间精确地传递、再现颜色信息一直是色彩管理者追求的目标和研究的课题。输入是色彩传递的第一道工序,在色彩传递中起着引导作用;输出是色彩传递的最后工序,在色彩传递中起着决定性的作用。所以,要做好色彩管理,首要的是要做好彩色输入、输出设备色彩管理,因此对扫描仪和打印机的设备特性进行研究是色彩管理系统中最为基础且必不可少的工作。课题在对扫描仪、打印机呈色特性分析及色偏研究的基础上,对输入输出设备的颜色空间以及与设备无关的颜色转换模型进行了研究。采用了20项多项式回归的算法建立了扫描仪的正反变换模型和打印机的反变换模型。以设备无关的CIELab的颜色空间作为中介空间,建立了输入输出设备间的色域映射。在实现了打印机CIELab->CMY转换的基础上,采用了GCR和UCR确定了K值,从而实现了CIELab->CMY->CMYK的转换。对CMYK模式的TIFF图像格式进行了详细的分析,采用了TIFF图像格式来实现经颜色空间转换后的CMYK图像的存储和打印。分析研究了MFC为用户提供的打印机驱动的基本函数,重写OnPrint函数直接驱动打印机实现了图像输出。在图像的打印输出过程中,因为各种问题引起的网点扩大的问题是必然存在的,课题对打印机的网点扩大问题进行了研究,建立了C、M、Y、K各色通道分区域的补偿关系,较好的实现了网点扩大补偿。本课题的研究成果为今后色彩管理的深入研究打下了理论基础,积累了丰富的实践经验。开发出的软件具有处理速度快,能真实的再现原稿等优点,在计算机输入与输出设备的色彩管理系统研究中具有一定的应用价值。更多还原

【Abstract】 Color management is an important way to realize high quality reproduction of multicolor among different devices. Accurately communicating and reproducing color information among different devices has always being the color management’s target and an important subject for research.Input is the first working procedure of color delivery, lead the color delivery; Output is the final color working procedure, and playing decisive role in color delivery. Therefore, to be ready for color management, finishing the color management of input and output equipment is very important. So, characteristic property researching is the most essential working in color management system of the scanner and the printer equipment.The subject research the color conversion model of input and output devices color space with device-independent color space based on analyzing color characteristic property of scanner and printer, and adopting 20 polynomial regression to build the scanner positive and reversal conversion model and the printer on the contrary conversion model, building color gamut mapping of input and output devices according color space with device-independent CIELab color space which is the intermediary agent space. On the basis of realizing the transform of CIELab->CMY, the subject adopts GCR and UCR to ascertain K value, achieve the transformation of CIELab-> CMY-> CMYK. After analyzing TIFF image format of CMYK pattern, it can be used to realize the saving of image which is the result of color space conversion to print directly. The subject analysis and research the basic function of printer driver provided by MFC for user. The subject research the problem of dot gain of printer which is existed during the process of image’s printing because of many complicated factors, and building the compensation relationship between passage of C, M, Y, K, fairly good realize the compensation of dot expanding.Research result of this subject laid down rationale for further studying in color management, accumulated rich practical experience. The software can process quickly, reproduce amanuscript truly, have a certain application value in color management system research of input and output devices.更多还原