TIFF file and CMYK

[storein]

Hi Everybody ,

I want to dispose Tiff file ,but I find it is difficult for me to dispose
Tiff image file

I have downloaded the TIFF 6.0 specification and LibTiff 3.5.7

But I don't know how to use it .

there is a example about using libtiff in

http://www.ibm.com/developerworks/linux/library/l-libtiff.

but That article focuses on black-and-white TIFF images

where can I find example about color TIFF images ?

My purpose is that I read every channel of CMYK tiff file ,I decode it
and Save
the every channel to the memory , I dispose every pixel value of every
channel of CMYK ,
then I code and write it to CMYK color mode file .

thank you very much !