Re: NullPointerException always thrown whne invoking "Enhance Local Contrast (CLAHE)" from java plugin

Posted by Saalfeld, Stephan on Aug 11, 2014; 4:15pm
URL: http://imagej.273.s1.nabble.com/NullPointerException-always-thrown-whne-invoking-Enhance-Local-Contrast-CLAHE-from-java-plugin-tp5009096p5009098.html

Please try:

ImagePlus image = IJ.openImage(currentImagePath);
image.show();
IJ.run(image, "Enhance Local Contrast (CLAHE)", "blocksize=127
histogram=256 maximum=3 mask=*None* fast_(less_accurate)");
image.updateImage();

The plugin's run method fails if the image isn't displayed.  You may
want to use the API method directly instead of IJ.run(...) which is
better anyways and does not require the image to be shown:

mpicbg.ij.clahe.Flat.getFastInstance().run(
  image,
  63,      // blockRadius
  256,     // bins
  3.0f,    // slope
  null,    // mask
  false    // composite
);

Does that work for you?

Best,
Stephan




On Mon, 2014-08-11 at 18:58 +0300, George H wrote:

> Hi,
>
> I am not sure why this is happening but I am always getting a
> NullpointerException on the second line with the invocation of IJ.run(....)
>
> ImagePlus image = IJ.openImage(currentImagePath);
> IJ.run(image, "Enhance Local Contrast (CLAHE)", "blocksize=127
> histogram=256 maximum=3 mask=*None* fast_(less_accurate)");
> image.updateImage();
>
> When I do it manually with record macro that's why shows up. How come in
> the Java plugin it throws a NullPointerException ?
>
> Thanks.
> --
> George
>
> --
> ImageJ mailing list: http://imagej.nih.gov/ij/list.html

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