1. An image processing method, comprising: obtaining a metadata-based classification result based on metadata associated with an image, wherein the obtaining comprises initially classifying the image into the scene type class based on a first condition on a first one of the metadata corresponding to a measure of amount of light received in capturing the image and a second condition on a second one of the metadata corresponding to a measure of brightness of the image; determining a histogram-based classification result based on a histogram of intensity values derived from the image wherein the determining comprises applying to the histogram a histogram predicate defining the scene type class in terms of multiple conditions on the histogram; and classifying the image into a scene type class based on the metadata-based classification result and the histogram-based classification result; wherein the obtaining, the determining, and the classifying are performed by computing hardware.