KERLUMPH is a lossy JPEG2000 Data Compression software for magnification maps. Recent work evaluating the JPEG2000 (ISO/IEC 15444) standards as a future data format standard in astronomy has shown promising results on observational data. KERLUMPH has been developed to evaluate the standards suitability for data generated in numerical simulation — using GERLUMPH data as a case study. It enables the conversion of magnification maps — pixelated versions of the caustic pattern in the background source plane created by the foreground microlenses — into a compressed JPEG2000 file, and the inversion of the process in order to enable work with raw-like data. Our case study results suggest that JPEG2000 could also be suitable for other numerical datasets. In particular, well suited candidate are likely to be data structure such as gridded data or volumetric data. In our case study, lossy compression and a high compression ratio do not significantly compromise the intended use of the data for constraining quasar source profiles from cosmological microlensing.

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