阐述了G7的定义、工艺原理及其应用领域，介绍了传统TVI（Tone Value Increase）法与四维CMYK转换法，将G7与它们进行了对比研究，分析了各自的优点和局限性，发现G7对于印刷工艺过程控制具有明显的优势。最后讨论了G7认证的真正价值，以给印刷企业提供帮助。

The definition, technical principle, and application field of G7 was introduced. TVI method and 4-D CMYK Transform method were introduced. Their advantages and disadvantages were further analyzed by comparative study on the above methods. It was found that G7 has obvious advantages in printing process control. The value of G7 certification was discussed. The purpose was to provide reference for printing enterprises.