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gamma_corr(gamma = 0.5, contrast = 1.0, brightness = 0.0)，这三个参数的意义是什么，我了解到的gamma矫正原理就是 对像素经过这样的变换来进行gamma矫正，这里面的指数i对应的是哪个参数呢？
文档：https://docs.singtown.com/micropython/zh/latest/openmvcam/library/omv.image.html#image.Image.image.gamma_corr
源码：https://github.com/openmv/openmv/blob/d5ad043c30de31d16f6c483a47ab2126a383b8ac/src/omv/imlib/mathop.c#L14
