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If we think about this algebraically, what we really want to do is express the input pixel as the weighted sum of palette colours. This is nothing more than a linear combination of palette colours with weights :，推荐阅读搜狗输入法下载获取更多信息
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Before you share your location, you'll get to choose how long you want to share -- one hour, today only (ending at midnight), until you turn it off, or for a custom time period less than 24 hours. You can also stop sharing at any time.