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图像处理的滤镜算法
source link: https://juejin.im/post/5b9e127df265da0a9a395e01
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灰度滤镜 将颜色的RGB设置为相同的值即可使得图片为灰色，一般处理方法有： 1、取三种颜色的平均值 2、取三种颜色的最大值（最小值） 3、加权平均值：0.3R + 0.59G + 0.11*B for(var i = 0; i < data.length
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