What is the fastest way to generate and display a thumbnail from a
digital camera file?
In the past I used NSImage -- however the quality (with JPEG files)
leaves something to be desired. Now I am using CIImage with Lanczos
scale transform -- quality is very good but it is slow (particularly
with raw files).
Should I be using the thumbnail capability of Image I/O? Will it have
as good a quality as CIImage, but be faster?
I am comparing the speed of my app (running in Xcode) with the speed
of Preview. Preview is much faster ( 2x or 3X). I wonder what they are
doing.
Of course the fastest way to display a thumbnail is to use the
thumbnail in the file (assuming there is one). But that's the problem,
there may not be a thumbnail in the file, in which case you need to
create one yourself.
Thanks for any help,
Jim Merkel
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