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1. pixels值都增加 => 整張相片變白
pixels值都乘以某個倍數 => 相片對比變大
2. Mat 包含兩個parts:
(1) matrix header: matrix information =>size : constant
(ex: the size of the matrix, the method used for storing, at which address is the matrix stored, and so on)
(2) a pointer to the matrix containing the pixel values =>size : varied
key point : (1) assign and copy => only header
ABC實際上指到同一個matrix,所以其中一個更動到matrix就會影響到其他人
FGA彼此互不影響(指到各自的matrix)
hue : 色調saturation : 飽和
value / luminance : 明視度
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