I agree with David's comment. An understanding of all the techniques is good before committing to one. You can try several with the Classification Learner app on the Apps tab of the tool ribbon. Attached is my demo of PCA with an image.
Recently (this year I think), I did a program for somebody who had hyperspectral images. Search the Answers forum for it. But it's a straightforward adaptation of the attached demo that does it in RGB space.