Supplemental Fig1

Figure 1. Podocarpus salignus dead foliage ash/char (Fig. 2E) illustrating the stages of image processing used to determine charcoal percentages. (A) Histogram values obtained for all pixel values in the 8 bit greyscale photograph. (B) Image manually thresholded to a greyscale value of 50 to highlight the charcoal in the image. (C) Default threshold applied to the whole image to separate the background from the ash/char sample and to derive a maximum ash greyscale value.