ROI、scale、padding 三者是强相关的
your "true" PIN is a static value calculated from your card number and a key,
Most digital images intended for viewing are generally assumed to be in sRGB colour space, which is gamma-encoded. This means that a linear increase of value in colour space does not correspond to a linear increase in actual physical light intensity, instead following more of a curve. If we want to mathematically operate on colour values in a physically accurate way, we must first convert them to linear space by applying gamma decompression. After processing, gamma compression should be reapplied before display. The following C code demonstrates how to do so following the sRGB standard:，这一点在heLLoword翻译官方下载中也有详细论述
Code dump for 2.16，更多细节参见91视频
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