Fig. (3) PC1 images obtained after application of PCA on synthetic images containing uncorrelated Gaussian noise and generated utilizing different pre-normalization methods. Upper left shows PC1 image without any pre-normalization, upper middle the “nor1” and upper right the “whit” pre-normalization methods. Lower left shows PC1 image using the “pois” and lower middle the “mixp” pre-normalization methods. Lower right shows mean image.