HAPPy plugins Black reference methods br-annotation-avg br-avg br-col-avg br-none br-same-size White reference methods wr-annotation-avg wr-col-avg wr-none wr-same-size Reference locators rl-file-pattern rl-fixed rl-from-annotation rl-manual Normalizations norm-fixed norm-none norm-object-annotations norm-region norm-simple HAPPY data readers happy-reader matlab-reader HAPPY data preprocessors crop derivative down-sample extract-regions multi-pp pad pass-through pca sni snv std-scaler wavelength-subset HAPPY data writers happy-writer matlab-writer png-writer Pixel selectors ps-column-wise ps-grid-wise ps-multi ps-simple Region extractors re-full re-grid re-object