The Guide Line option allows you to select a display overlay which is
useful for such things as getting your picture composition stronger by
using the “rules of thirds” grid lines (the top selection).
The lower grid line option allows you to set the horizontal and vertical
positions of two guidelines which are displayed.
Reading Histograms
The Histogram feature is useful for displaying the distribution of image
tones (brightness values).
The Histogram, shown above, displays the brightness tones in the image
from black on the extreme left (3) through mid gray (2) in the centre and
whites (1) on the right hand side.
The height of the bars indicates the number of pixels in that range.
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