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In this paper we review THELI (Erben & Schrimer, 2005), an image processingpipeline developed to reduce multi-pointing optical images taken by mosaic CCDcameras. This pipeline works on raw images by removing several instrumentalcontaminations, implementing photometric calibration and astrometric alignment,and constructing a deep co-added mosaic image complemented by a weight map. Wedemonstrate the procedure of reducing NGC3923 images from raw data to the finalresults. We also demonstrate the quality of our data reduction strategy usingmag-count and mag-error in mag plots. Emphasis is mainly placed on photometriccalibration which is of great interest to us due to our scientific case. Basedon the cross-association of the extracted catalogue against a referencecatalogue of stellar magnitudes, zero-point calibration is performed. Our datareduction strategy and the method employed for cross-correlating largecatalogues is also presented.

Using THELI pipeline in order to reduce Abell 226 multi-band optical images