Comments on: JAI vs. ImageMagick image resizing

By: JavaUser

JavaUser — Tue, 12 May 2009 03:35:59 +0000

ImageMagick is an excellent package. However, you don’t need to use it to get top-quality scaled images.

Image.getScaledInstance(…, Image.SCALE_AREA_AVERAGING) gives you the maximum-possible scaling quality, and you don’t need to mess around with ImageMagick. It’s slow, but I haven’t done performance comparisons, so I don’t know how much slower than IM. If you want top-quality resizing, without needing to use external binaries, Image.getScaledInstance(…, Image.SCALE_AREA_AVERAGING) is what you need.

By: Sean Kleinjung

Sean Kleinjung — Wed, 04 Feb 2009 21:48:11 +0000

It is possible to get ImageMagick’s level of quality when using JAI to resize images. I have written a tool called ThumbMaster which is a new Interpolation implementation that uses the same algorithm as ImageMagick. It allows you resize images using standard JAI APIs without the complexity and overhead of integrating with a command line tool. More information is available at the tool’s website, devella.net/thumbmaster.

Full disclosure: I am the developer of ThumbMaster, and am posting this here because I do believe it is a relevant solution to the problems expressed by many of the above posters.

By: Jeans

Jeans — Mon, 15 Sep 2008 12:39:10 +0000

Hi.

we’ve had much probs with ImageIO.read() – our application / javaVM halted COMPLETELY when using this on some pictures – we run imageMagick “correctimage” before reading with ImageIO.read().
Perhaps this has nothing to do with your error (color conversion), but perhaps it helps on some problems.
(If we got errormessages from ImageIO.read – in most cases they are random but had nothing to do with the real problem on current image)….

By: kanwar

kanwar — Mon, 01 Sep 2008 07:33:56 +0000

Hi Guys,
i think this is a very nice thread going on here,
i am running into a problem here
i used exec and created jpg’s from other formats like eps and ai,
jpg’s created were all fine , opens properly from all viewers, but when i try to read them through java ImageIO.read(..)
it fails , it give this exception
sun.awt.image.ImageFormatException: Unsupported color conversion request
at sun.awt.image.JPEGImageDecoder.readImage(Native Method)
at sun.awt.image.JPEGImageDecoder.produceImage(Unknown Source)
at sun.awt.image.InputStreamImageSource.doFetch(Unknown Source)
at sun.awt.image.ImageFetcher.fetchloop(Unknown Source)
at sun.awt.image.ImageFetcher.run(Unknown Source)
sun.awt.image.ImageFormatException: Unsupported color conversion request
at sun.awt.image.JPEGImageDecoder.readImage(Native Method)
at sun.awt.image.JPEGImageDecoder.produceImage(Unknown Source)
at sun.awt.image.InputStreamImageSource.doFetch(Unknown Source)
at sun.awt.image.ImageFetcher.fetchloop(Unknown Source)
at sun.awt.image.ImageFetcher.run(Unknown Source)

PLEASE HELP, i need this ASAP done

By: Thilo

Thilo — Sun, 01 Jun 2008 19:19:24 +0000

Hi @all,
since years I’m successfully using ImageMagick via Runtime#exec on Windows, OS X and Linux. It’s very stable and quick. Fine!
But there is one problem I couldn’t solve yet: If the path of an image contains one or more spaces, the command fails. I’ve tried various possibilities of escaping, but no success! I’ve tested it on OS X for now.

Is there anybody who has an hint for me?

Best regards
Thilo

By: vpetreski

vpetreski — Tue, 29 Apr 2008 19:45:27 +0000

For pure java and high quality resize:

http://www.comesolvego.com/2008/04/29/resize-images-with-java-high-quality-and-working-solution/

By: krishna

krishna — Mon, 11 Feb 2008 14:59:04 +0000

Hey,
I got it working…Some how it wasn’t working for me using runtime exec.
I tried with Process builder class and it worked.
Here is the code for your reference.

try {

String strArr[]={ “/usr/local/ImageMagick-6.3.7/bin/convert”,
“testimage.jpg”,
“-resize”,
“96x”,”imagetoresize.jpg”};
ProcessBuilder pb = new ProcessBuilder(strArr);

//I need this environment variable in my path…This step is optional.
Map env = pb.environment();

env.put( “LD_LIBRARY_PATH”, “:/usr/local/ImageMagick-6.3.7/lib” );

pb.redirectErrorStream( true );

Process p = pb.start();

} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

By: krishna

krishna — Fri, 08 Feb 2008 14:13:45 +0000

Hi
I am using Imagemagick 6.3.7 on solaris.I tried the above code and I get the following
output from error stream.
no decode delegate for this image format `myimage.jpg’.
missing an image filename `resizeimage.jpg’.
I am trying to resize myimage.jpg to resizeimage.jpg.

I have no clue why its happning.
Can somebody help?

By: John Bäckstrand

John Bäckstrand — Tue, 22 Jan 2008 10:36:06 +0000

Argh!

I’ve spent atleast 40 hours on some JAI image-resizing/watermarking code, and now I realize it is completely unusable for animations!

I should have gone with imagemagick to start with. Now, using imagemagick instead isn’t a big deal, but it is annoying to switch between JAI and im, and I dont like depending no external executables. I did read this page earlier though, and I solved the scaling problems kinda nicely with JAI, by “cheating” via multiple small downscaling steps, instead of one big. This is sometimes done in Photoshop på upsize images for example, but it also works to remove aliasing when downsizing.

By: Michael

Michael — Tue, 18 Dec 2007 08:53:08 +0000

Maybe a bit late, but thanks for that information, you saved me a lot of time