Public bug reported:

Recently moved to a Canon T2i SLR, which shoots 18 megapixel (6MB)
images.  A simple thumbnails listing now takes several minutes.

Triaging this bug, this comes from parsing exif data on every image.

The solution is to split the is_image() function into a "fast" one that
can be use on thumbnail listing (when we have to examine more than one
file), but keep one that parses exif data when we're just loading one
file.

** Affects: pictor (Ubuntu)
     Importance: High
     Assignee: Dustin Kirkland (kirkland)
         Status: Fix Released

** Affects: pictor (Ubuntu Precise)
     Importance: High
     Assignee: Dustin Kirkland (kirkland)
         Status: Fix Released

** Changed in: pictor (Ubuntu)
   Importance: Undecided => Critical

** Changed in: pictor (Ubuntu)
       Status: New => In Progress

** Changed in: pictor (Ubuntu)
     Assignee: (unassigned) => Dustin Kirkland (kirkland)

** Also affects: pictor (Ubuntu Precise)
   Importance: Critical
     Assignee: Dustin Kirkland (kirkland)
       Status: In Progress

** Changed in: pictor (Ubuntu Precise)
   Importance: Critical => High

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https://bugs.launchpad.net/bugs/952186

Title:
  thumbnails print takes a very long time when images are huge

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