摘要：随着科技的进步和印刷技术的飞速发展，人们对精美印刷品的需求越来越多。高质量的精美印刷品早已成为人们生活中不可或缺的组成部分。现今，印前数字网络化、印刷多色高效化和颜色精确的高质化是印刷市场的普遍追求。而现代色彩管理，通过对各种设备呈色特性的数字化描述和颜色特征文件的色空间转换，突破了不同设备、材料、环境对于生产的制约，实现“所见即所得”。其中的G7技术是GRACoL委员会提出以控制中性灰平衡为主要手段的工艺方法来控制印品质量，它主要是通过分光光度计对印张上中性灰平衡部分进行测量控制， 以一个新的NPDC曲线(Neutral Print Density Curve)来匹配图像的视觉效果。本文浅谈对G7技术在我国印刷企业中的应用研究。研究表明：GRACol 7技术规范仍需考虑进一步的改进，提出公差范围，完善G7的标准化，国际化。
关键词：GRACol 7；G7工艺；色彩管理；灰平衡；NPDC曲线；
Abstract: With the development of science including printing technology, there has been more public’s requirement to exquisite printing product. High qualified print takes an important part in people’s daily life. Now, online digital preprint process， efficient multicolor print process and qualified accuracy of color figures leads the market demand. In modern color management, through controlling the color spaces transformation of digital definition and color feature files among the equipments, it shift the constraints from different devices, materials and environment, make the WYSWYG come true. Besides, G7 technology is found by GRACol committee to control the quality of print based on mainly Gray Balance process, it generally use the spectrophotometer to measure and operate the Gray Balance part, making a new NPDC adjustment of visual effect. In this paper utilization research of G7 technique in Chinese printing enterprises was introduced near to professional, and it was indicated by research that GRACoL 7 need to be improved. Put its tolerance area forward, bring the standard to completion internationally as well.
Key words: GRACol 7；G7 process；color management；Gray Balance；NPDC;
