示例：
B = colorspace('dest<-src', A) converts image A from color space 'src' to color space 'dest'.

Example:
B = colorspace('HSV<-RGB',A); % Convert image A from RGB to HSV
C = colorspace('YCbCr<-HSV',B); % Convert HSV to YCbCr
D = colorspace('RGB<-YCbCr',C); % Convert YCbCr back to RGB