createScaledRen dering weird problem when create small thumbnail

[xj92wang]

I have following code to convert a big image to smaller thumbnail,
it work's fine until one day this image come out

http://www.here4now.com/mobdata/sunb...Untitled-2.gif

The original size is 200x205, if I resize it to 101x103, it looks
still fine, but one pixed smaller , say 100x102, the result image is
total unacceptable.

Any help or hint will be appreciate
Ivan Wang

P.S. I didn't use Image.getScaled Instance to resize the image because
our server don't have X-window installed.

/*************** *************** *************** *************** *******/
public static void resize(String file1, String file2){
source = JAI.create("fil eload", file1);
ParameterBlock pb = new ParameterBlock( );
pb.addSource(so urce);
pb.add(null).ad d(null).add(nul l).add(null).ad d(null);
RenderableImage ren = JAI.createRende rable("renderab le", pb);
pb = new ParameterBlock( );
pb.addSource(re n);
int w = source.getWidth ()/2;
int h = source.getHeigh t()/2;
//RenderingHints renderingHints = new RenderingHints( null );
//renderingHints. put( RenderingHints. KEY_COLOR_RENDE RING,
// RenderingHints. VALUE_COLOR_REN DER_QUALITY );
PlanarImage dst = (PlanarImage)re n.createScaledR endering(w, h,
null);
JAI.create("fil estore",dst,fil e2,"PNG");
}
/*************** *************** *************** *************** *******/

[Roedy Green]

On 28 Jun 2004 07:44:53 -0700, xj******@yahoo. com
(xj******@hotma il.com) wrote or quoted :

The original size is 200x205, if I resize it to 101x103, it looks
still fine, but one pixed smaller , say 100x102, the result image is
total unacceptable.

Any help or hint will be appreciate

Gifs only look decent resized when you scale them by powers of two.
If you want something that scales well, use JPEG.

--
Canadian Mind Products, Roedy Green.
Coaching, problem solving, economical contract programming.
See http://mindprod.com/jgloss/jgloss.html for The Java Glossary.

[xj92wang]

xj******@yahoo. com (xj******@hotma il.com) wrote in message news:<a9******* *************** ****@posting.go ogle.com>...

I have following code to convert a big image to smaller thumbnail,
it work's fine until one day this image come out

http://www.here4now.com/mobdata/sunb...Untitled-2.gif

The original size is 200x205, if I resize it to 101x103, it looks
still fine, but one pixed smaller , say 100x102, the result image is
total unacceptable.

Any help or hint will be appreciate
Ivan Wang

P.S. I didn't use Image.getScaled Instance to resize the image because
our server don't have X-window installed.

/*************** *************** *************** *************** *******/
public static void resize(String file1, String file2){
source = JAI.create("fil eload", file1);
ParameterBlock pb = new ParameterBlock( );
pb.addSource(so urce);
pb.add(null).ad d(null).add(nul l).add(null).ad d(null);
RenderableImage ren = JAI.createRende rable("renderab le", pb);
pb = new ParameterBlock( );
pb.addSource(re n);
int w = source.getWidth ()/2;
int h = source.getHeigh t()/2;
//RenderingHints renderingHints = new RenderingHints( null );
//renderingHints. put( RenderingHints. KEY_COLOR_RENDE RING,
// RenderingHints. VALUE_COLOR_REN DER_QUALITY );
PlanarImage dst = (PlanarImage)re n.createScaledR endering(w, h,
null);
JAI.create("fil estore",dst,fil e2,"PNG");
}
/*************** *************** *************** *************** *******/

Here is my new code, the scaled picture looks alright this time

public static void resize(String file1, String file2){
source = JAI.create("fil eload", file1);
ParameterBlock pb = new ParameterBlock( );
pb.addSource(so urce);
pb.add(null).ad d(null).add(nul l).add(null).ad d(null);
RenderableImage ren = JAI.createRende rable("renderab le", pb);

int h = source.getHeigh t();
int w = source.getWidth ();
PlanarImage dst = (PlanarImage)re n.createScaledR endering(w, h, null);

pb = new ParameterBlock( );
pb.addSource(ds t);
pb.add(0.3f); // 0.3 is just some test data
pb.add(0.3f);
pb.add(0.0f);
pb.add(0.0f);
pb.add(new InterpolationNe arest()); // <-- this is the key
PlanarImage transformedImag e = JAI.create("sca le", pb, null);
JAI.create("fil estore",transfo rmedImage,file2 ,"PNG");
}
=============== =============== =============== ==============
I have to use JAI.create("sca le",pb,hints)
rather than createScaledRen dering(w, h, hints) to make it working.