C#图片处理之:亮度和对比度的校正
亮度和对比度应该是最常见的处理要求了。就算是N年前9寸黑白电视机也必有这两个旋钮。
亮度调整算法很简单。对每一个像素的RGB值同时加上或减去一个特定的值就可以了。当然由于RGB取值范围都是在[0,255]的,所以要考虑到越界的问题。
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对比度校正的思想也很简单,大的原则就是让亮的更亮,暗的更暗。具体实现的方式有很多种,比如取一个阀值,超过的就加一定的值,不到的就减一定的值等等。
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亮度和对比度应该是最常见的处理要求了。就算是N年前9寸黑白电视机也必有这两个旋钮。
亮度调整算法很简单。对每一个像素的RGB值同时加上或减去一个特定的值就可以了。当然由于RGB取值范围都是在[0,255]的,所以要考虑到越界的问题。
对比度校正的思想也很简单,大的原则就是让亮的更亮,暗的更暗。具体实现的方式有很多种,比如取一个阀值,超过的就加一定的值,不到的就减一定的值等等。