Re: Modified input image

Posted by Michael Doube on
URL: http://imagej.273.s1.nabble.com/Modified-input-image-tp3686496p3686499.html

  Thanks for the description Adrian,

There is also a Duplicator class in ij.plugin that can do this work on
ImagePlus objects, if you need a copy of an imp with calibration and
overlays set.

Duplicator dup = new Duplicator();
ImagePlus imp2 = dup.duplicateImage(imp1);

Michael

On 04/11/2010 17:21, Adrian Daerr wrote:

>> Arne Seitz wrote:
>>> [...] the input image is changed [...]
> Johannes Schindelin answered:
>> I think the problem is that you haven't duplicated the processor, and as
>> such, you are reusing the very same pixels.
> Just a small explanation because I think Johannes' statement is
> confusing even though it is (unsurprisingly) correct: instantiating a
> new Processer (with the 'new' keyword) /does/ give you a processor
> distinct from the original. And it even becomes a duplicate of the
> original by virtue of the initialisation from the original image's
> properties. The problem is that by giving it a pointer to the initial
> image's pixel array, Arne has it point to the same pixel data. So the
> processor is a duplicate, but not the associated pixel data.
>
> To phrase it differently: with 'new ShortProcessor(<initialisation from
> imp's properties>)' Arne created a /shallow/ duplicate of the other
> processor, whereas the processor's duplicate() method does a /deep/ copy
> which also duplicates the pixel data. The source code of the
> ShortProcessor.duplicate() method is self-explanatory.
> http://rsb.info.nih.gov/ij/developer/source/index.html
>
> Obviously Johannes suggestion to use duplicate() is way to go:
>
>> ShortProcessor ip  = imp.getProcessor().duplicate();