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Re: Creating image thumbn

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  To: comp.lang.java.gui
Bill wrote:
> My java application is given a list of image files.  For each image,
> it creates an image thumbnail and displays this thumbnail in a
> separate JFrame.  The creation of these thumbnails is very slow
> compared to the Mac Preview application.  Is there a way to speed
> this up?

When optimising, I'd first find out what part of your program is slow -
instrument it and/or profile it or benchmark it.


> Each thumbnail is displayed in a separate JFrame to allow the
> thumbnails to be dragged and repositioned on the screen
> independently.

To me that seems a bit unnecessary. I imagine it would be a great deal
faster to do your own 2d rendering. That way you're avoid instantiating
lots of JFrames.


> Each thumbnail is converted to an ImageIcon and displayed in a
> JButton. Clicking on the button will rotate the image 90 degrees.
> 
> Here is the method which creates the JFrame.  I'd appreciate any 
> suggestions how I can improve performance speed.

I believe a lot of similar applications cache the thumbnails in memory
and some save the thumbnails to disk - reading a thumbnail from disk has
to be faster than reading a large image and then resizing it.

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Thread

Creating image thumbnails "Bill" <bill@THRWHITE.remove-dii-this> - 2011-04-27 15:42 +0000
  Re: Creating image thumbn "RedGrittyBrick" <redgrittybrick@THRWHITE.remove-dii-this> - 2011-04-27 15:42 +0000
  Re: Creating image thumbn "Roedy Green" <roedy.green@THRWHITE.remove-dii-this> - 2011-04-27 15:42 +0000

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