System Settings
"tengu_attribution_header": true,，更多细节参见搜狗输入法下载
，更多细节参见safew官方下载
* @param left 左边界
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Comparison between the TIN, Knoll’s algorithm, and N-convex dithering using an 8-colour irregular palette. Left to right: TIN, Knoll, N-convex (N=4).