数码摄影中打印机色彩管理系统的设计与实现

发布时间：2018-04-05 18:35

本文选题：色彩管理　切入点：色彩再现　出处：《西安电子科技大学》2012年硕士论文

【摘要】：目前，数字成像技术已经发展的十分成熟，在摄影行业，传统的胶片成像已经逐步淘汰。在数码照片输出方面，早期使用数码冲印技术来获得相片，而随着近年来彩色喷墨打印机的成像技术突飞猛进，其打印质量已经可以与数码冲印技术相媲美。在一些商业摄影与专业摄影领域，很多摄影师开始选择用彩色喷墨打印机来输出数码照片。由于打印机色彩的设备相关性，其色彩再现并不准确，需要色彩管理技术来控制色彩的转换。目前较为通用的色彩管理技术是国际色彩联盟（ICC）制订的色彩管理规范，通过引入设备无关色彩空间来实现色彩的跨设备再现过程。在实际应用中，大部分色彩管理软件仅对打印机的彩色特性进行校正，而并未考虑图像的彩色特征，使得色域匹配算法不能根据图像的色彩特征进行针对性的选择。单纯的使用压缩算法，将会大幅降低输出照片的色彩饱和度；单纯的使用剪裁算法，将使一些大面积高饱和色区域的细节损失。对于数码照片来讲，这一问题使打印输出的照片饱和度与色彩过渡得不到最优的表现。本文通过对影像行业数码照片打印输出的需求分析，在充分考虑彩色数码照片色彩特征的基础上，提出了一种基于图像彩色特征的色域匹配算法，并设计出一套符合ICC规范的打印机色彩管理系统。提出的新算法基于内核不变CUSP算法的原理，采用变内核区域思路，在PCS空间中，，将CUSP算法的内核区域大小分为5个级别，通过统计数码照片的彩色特征信息，自动匹配相应的内核大小参数。在进行图像输出时，本文设计的色彩管理系统将根据图像的色彩统计特征选择适合的渲染目的并写入彩色特性文件（Profile）。彩度比较大的照片适用比较大的内核，彩度比较小的照片适用比较小的内核，从而使一些饱和度较高的风光、广告类照片输出后依然可以保持较高的饱和度，一些中低彩度的肖像、写真类照片输出后可以保持较好的色彩过渡。
[Abstract]:At present, digital imaging technology has been developed very mature, in the photography industry, traditional film imaging has been phased out.In the aspect of digital photo output, digital photofinishing technology was used in the early years to obtain photos. With the rapid development of imaging technology of color inkjet printer in recent years, the printing quality of color inkjet printer has been comparable to that of digital printing technology.In some areas of commercial photography and professional photography, many photographers choose color inkjet printers to output digital photos.Because of the correlation of printer color, color reproduction is not accurate, color management technology is needed to control color conversion.At present, the more common color management technology is the color management standard developed by the International Color Alliance (ICCC), which realizes the cross-device reproduction process of color by introducing the device-independent color space.In practical application, most of the color management software only corrects the color characteristics of the printer, but does not consider the color features of the image, so the color gamut matching algorithm can not be selected according to the color features of the image.The simple use of compression algorithm will greatly reduce the color saturation of the output photos, and the simple use of the clipping algorithm will make some large areas of high saturation color region detail loss.For digital photos, this problem makes the saturation and color transition of the print output not optimal.Based on the analysis of the requirements of digital photo printing and output in image industry, a color gamut matching algorithm based on color features of color image is proposed in this paper, based on the full consideration of color features of color digital photos.And design a printer color management system in accordance with ICC specification.The new algorithm is based on the principle of kernel invariant CUSP algorithm, and adopts the idea of changing kernel region. In PCS space, the kernel region size of CUSP algorithm is divided into five levels, and the color feature information of digital photo is counted.Automatically matches the corresponding kernel size parameters.In the process of image output, the color management system designed in this paper will select the appropriate rendering purpose according to the color statistical features of the image and write the color characteristic file into the profile file.Photographs with a larger color degree are suitable for a larger kernel, while photos with a lower color intensity are suitable for a smaller kernel, so that some of the scenery with higher saturation can still be maintained at a higher saturation after the output of the advertisement photo.Some low-and medium-color portraits, pictographs can be exported to maintain a better color transition.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TP391.41

【共引文献】