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使用preview engine将Bayer Pattern data转换为yuv422,色彩有问题

使用preview engine将Bayer Pattern data转换为yuv422,色彩有很大的偏差,我的是偏红色,我怎么修改preview engine的参数能使视频颜色最接近真实的效果呢,或者跟我说说核心参数的意义!我觉得主要的原因可能是 RGB2RGB blending parameters 和RGB2YCBCR parameters这两个转换矩阵的问题,但是矩阵值的理论依据在哪?who can help me?不胜感激!