添加渐变叠加，以避免平面彩色和中风添加照片边框，这是一个宝丽来照片的特点。
Add Gradient Overlay to avoid flat color and Stroke to add photo border, which is the characteristic of a Polaroid photo.
传统的彩色打印系统特征化模型通常基于打印基色的色密度具有加和性的假设，然而实际中叠加特性缺失的现象经常出现。
Conventional printer characterisation models are generally based on the assumption that the densities of primary colours are additive. However, additivity failure frequently occurs in practice.
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