I=imread（‘2.jpg‘）;
I1=rgb2lab（I）;
I2=uint8（I1）;
imshow（I2（::1））;
imshow（I2（::2））;
imshow（I2（::3））;
imwrite（I2（::1）‘l.png‘）;
imwrite（I2（::2）‘a.png‘）;
imwrite（I2（::3）‘b.png‘）;

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件????????198??2013-05-08?09:49??rgb2lab\ex.m

?????文件???????1147??2013-05-08?09:36??rgb2lab\rgb2lab.m

?????文件????????375??2013-05-08?09:37??rgb2lab\rgb2xyz.m

?????目錄??????????0??2013-05-08?09:50??rgb2lab

-----------?---------??----------?-----??----

?????????????????1720????????????????????4