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Figure 4
The gradient directions for the image in (a) are plotted in (b). In (c), a mask for the well has been applied and the small droplets and line in the plastic tray have been removed. The area indicated by the red rectangle is enlarged in (d). In (e), the possible choices of four pixels to average over, including the central pixel, are outlined in red, green, blue and yellow.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 38| Part 3| May 2005| Pages 493-500
doi:10.1107/S0021889805007442
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