MakeClassImage[label]

makes a cross-sectional image of the classes label of a training dataset generated by GetTrainData

MakeClassImage[label,{b,n}]

same but with explicit definition of background value b and number of classes n.

MakeClassImage[data,vox]

same but with the aspect ratio determined by vox.

MakeClassImage[label,{b,n},vox]

same with explicit definition and aspect ratio definition.