Originally posted by Christopher Lindner:
Hi Chris,

Thanks for your reply.

In the context of my work, I need to change some of the training parameters. However, it then doesn't work as expected when I run the classification on my test samples. I can see the range of intensity values in the training patches is between 0 and ~2500, while this is between 0 and ~0.75 in my test samples. Therefore, I thought the problem comes from the fact that my test data points are far from the training data points and as a result, I will always get all the test samples classified as -1 or +1 (please note that I'm still trying to build a regression based RF). I then tried to change the contrast of my test samples and realised that I get much reasonable results. However, the problem now is that I don't know to what scale I should change the contrast of my test samples. 
It would be much appreciated if you could provide me with some details of the training image's contrasts. It might also help if I can download the training images from a repository.

Thanks in advance for your help.

Sasha