[vtkusers] How to get pixel information from vtkImageData

[李安安]

hello,

	 I have read a image by vtkPNGReader.How can I get pixel information with a coordinate.For example,I want to get the value of RGB in zhe position (100,100).
     thank you.


　　　　　　　　lianan
　　　　　　　　　　2006-05-18

Mr.Anan Li
Wuhan National Laboratory for Optoelectronics
Huazhong University of Science and Technology (HUST)
Wuhan, Hubei, China, P.R.,430074
Tel   : +86 27 8779 2033
Fax   : +86 27 8779 2034
E-mail: lianan2000 at sohu.com