Purity-completeness curves for galaxies in the magnitude range of 15 ≤ r ≤ 23.5, based on the morphological classification from SExtractor (CLASS_STAR, green dotted line), SGLC (black solid line), Extremely randomized trees (blue dashed line) and random forest (red dot-dashed line). ERT uses both the photometric (P) and morphological (M) information of the sources, while the RF uses photometric information only. AP is the area under the purity curve.