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Figure 4
TXM XANES wizard filtering, edge-jump determination and edge-energy determination as performed on a cross section of iron-rich Roman pottery (Sciau et al., 2011BB28). (a) Transmission images recorded below and above the Fe K-edge after alignment and magnification correction. (b) Left: `Combined filter', a binary image (red = 1, white = 0) showing the applied filter based on edge-jump and normalization filtering (see §6.1[link] and §6.2[link] for details). Center: `Edge-jump map', an image showing the magnitude of the Fe K-edge jump for each (non-filtered) pixel. This map shows Fe distribution and concentration differences within the analyzed FOV (see §6.1[link] for details). Right: map of the `Edge energy position', determined as the position of the half-height (0.5) of the normalized edge (see §6.2[link] for details). For this sample the map shows (at least) two regions of different Fe valence states within the FOV, where the red area has a higher oxidation state than the yellow area.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 19| Part 2| January 2012| Pages 281-287
doi:10.1107/S0909049511049144
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