Hi All,
Wayne provided a solution that I want to post for the archive. Note
the time Wayne responded! It is always a good time for ImageJ. Thanks
Wayne!
Cheers,
Ben
On Sep 17, 2008, at 12:36 AM, Rasband Wayne wrote:
> On Sep 17, 2008, at 12:30 AM, Rasband Wayne wrote:
>
>> Hello,
>>
>> IJ version 1.41k
>>
>> I am perplexed by the behavior of the setThreshold method for a
>> FloatProcessor class. I have a 32-bit image that I would like to
>> threshold to values of "threshLaplace" and greater. In my code
>> snippet below I have created a duplicate of the original 32-bit
>> image. When I show the thresholded image (mhMaskIp) I expect to see
>> the red/black arrangement I see when I use the menu commands. But I
>> don't. Instead I see a copy of the original.
>>
>>
>> //create the MH mask
>> //this shows where the MH is GE threshLaplace
>> mhMaskImp = new ImagePlus("MH-Mask",mhIp.duplicate());
>> mhMaskIp = mhMaskImp.getProcessor();
>> mhMaskIp.setThreshold( (double) threshLaplace, 1000000.0,
>> FloatProcessor.RED_LUT);
>> mhMaskImp.show();
>>
>> Ultimately, I would like to have the original and the masked images
>> (as byte is OK) without having to show them.
>
> Ben,
>
> It might help to reset the display range of the image using
> resetMinAndMax(). This Javascript example works as expected.
>
> IJ.newImage("Bulls Eye", "32-bit Ramp", 512, 512, 1);
> mhIp = IJ.getImage().getProcessor();
> mhIp.multiply(1000000.0);
> mhMaskImp = new ImagePlus("MH-Mask",mhIp.duplicate());
> mhMaskIp = mhMaskImp.getProcessor();
> mhMaskIp.resetMinAndMax();
> mhMaskIp.setThreshold( 500000, 1000000, FloatProcessor.RED_LUT);
> mhMaskImp.show();
>
> -wayne
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