Re: Fastest high-quality thumbnail display
Re: Fastest high-quality thumbnail display
- Subject: Re: Fastest high-quality thumbnail display
- From: James Merkel <email@hidden>
- Date: Mon, 25 Jul 2011 17:55:29 -0700
Well, I see I have a huge memory leak in CIImage.
However, I don't see where my code is in error.
Also, according to Instruments Object Allocation, ImageIO is holding
this memory.
So I guess Core Image calls IImageIO.
I'll have to look at this in more detail.
Jim Merkel
On Jul 25, 2011, at 3:58 PM, Mike Abdullah wrote:
On 25 Jul 2011, at 20:04, James Merkel wrote:
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).
Lanczos is high quality and slow, no way around that.
Should I be using the thumbnail capability of Image I/O? Will it
have as good a quality as CIImage, but be faster?
Yes, you should be using it. It won't be as high quality as CIImage
though.
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.
That's exactly what ImageIO offers you; the ability to use embedded
thumbnail if present.
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