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Colour matching for soft proofing using a camera

机译：色彩匹配，可使用相机进行软打样

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摘要

The goal of a colour management system (CMS) is to keep colour across different display devices. For example, a CMS may be developed to preserve colour from monitor to print. Printed colours on paper can look different from colours displayed on a monitor. Soft proofing is to preview a printed colour image on a monitor. The International Colour Consortium (ICC)/ColourSync media profile based on scanner and colorimetric devices are widely used to match between printed and displayed colours. This soft-proofing feature is effective only when accurate ICC profiles of monitor and printer are available with proper lighting condition. In this study, the authors present an on-site monitor-print colour-matching technique for soft proofing that uses a colour-measuring camera when appropriate device and illumination characteristics are not readily accessible. The proposed method consists of two matching steps: one is the estimation of lighting conditions and paper reflectance and the other is the estimation of printer and monitor characteristics. Lighting conditions and paper reflectance are measured by a camera using a white reference patch. Printer and monitor properties can be estimated using a number of colour samples in separate colour components (intensity and chromaticity). A three-dimensional look-up table method is used for intensity mapping, whereas chromatic adaptation is performed by a 2×5 transformation matrix and gamut mapping. Experimental results with several test images demonstrate that the proposed method shows better colour-matching performance, in terms of perceptual quality, than the soft proofing implemented in Photoshop.
机译：颜色管理系统（CMS）的目标是保持不同显示设备之间的颜色。例如，可以开发CMS，以保留从监视器到打印的颜色。纸上打印的颜色看起来可能与显示器上显示的颜色不同。软打样是在监视器上预览打印的彩色图像。基于扫描仪和比色设备的国际色彩协会（ICC）/ ColourSync介质配置文件被广泛用于在打印和显示的颜色之间进行匹配。仅当在适当的照明条件下可获得监视器和打印机的准确ICC配置文件时，此软校对功能才有效。在这项研究中，作者提出了一种用于软打样的现场监视器打印配色技术，该技术在无法轻松获得合适的设备和照明特性时使用测色相机。所提出的方法包括两个匹配步骤：一个是照明条件和纸张反射率的估计，另一个是打印机和显示器特性的估计。照明条件和纸张反射率是使用白色基准色标由照相机测量的。可以使用不同颜色分量（强度和色度）中的许多颜色样本来估计打印机和显示器的属性。三维查找表方法用于强度映射，而色适应由2×5变换矩阵和色域映射执行。带有多个测试图像的实验结果表明，与在Photoshop中实现的软打样相比，在感知质量方面，该方法显示出更好的色彩匹配性能。

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    《Image Processing, IET》 |2012年第3期|p.292-300|共9页
  • 作者

    Lee K.-Y.;

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