cv在把RGB空间转换为HSV和CIE(Lab)空间之前先把RGB的值转换到0~1。
然后,对于HSV:
On output 0≤V≤1, 0≤S≤1, 0≤H≤360.
The values are then converted to the destination data type:
8-bit images:
V <- V*255, S <- S*255, H <- H/2 (to fit to 0..255)
16-bit images (currently not supported):
V <- V*65535, S <- S*65535, H <- H
32-bit images:
H, S, V are left as is
对于CIE(Lab):
On output 0≤L≤1