Re: Image interpolation and display

Posted by Michael Schmid on May 04, 2007; 11:34am
URL: http://imagej.273.s1.nabble.com/Image-interpolation-and-display-tp3699590p3699592.html

Hi Jon,

the Java Documentation at Java.sun.com says, the interpolation
settings for displaying images are "hints" i.e., they are not
necessarily obeyed by the Java implementation.
Obviously, when downscaling, if the zoom factor is not a power
of two, many (all?) Java implementations do not honor the
settings.

I once wrote some code for downscaling to arbitrary sizes
with bilinear interpolation and I found it quite difficult
to do it correctly - it seems the guys at Sun have not gone
into that business...

Michael
________________________________________________________________

On 4 May 2007, at 00:37, Jon Harman wrote:

> Hi,
> I notice that much depends on the zoom factor.  At some zooms there  
> is not much difference between display quality in  ImageJ compared  
> to other programs.  At other zooms there is a difference.  Here is  
> an example.
>
> For this image at 33.3% the two ImageJ displays are  
> indistinguishable and are similar to PSP fastest quality.  PSP best  
> quallity is smoother as is Irfanview.