Hi,

Although we never reproduced this on our side, even with some
deliberately unusual PNG images (please see
http://redmine.yorba.org/issues/4195 for details), I can see where the
offending assertion would trigger if we somehow got an out-of-range
pixel (colour value less than 0 or greater than 255).

I've been tasked with preparing a patch that will clamp the incoming
value to a safe range, so even if 'the unthinkable' occurs, Shotwell
will silently correct it and continue to function.  The fix should be
available in trunk soon.

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https://bugs.launchpad.net/bugs/858930

Title:
  shotwell crashed with SIGABRT in
  intensity_histogram_get_cumulative_probability()

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