Re: Replace NaN in 32-bit images with 0

Posted by BenTupper on Mar 23, 2011; 5:46pm
URL: http://imagej.273.s1.nabble.com/Replace-NaN-in-32-bit-images-with-0-tp3685307p3685313.html

Hi,

On Mar 23, 2011, at 1:03 PM, mjlm wrote:

> Hi there,
>
> Is there a simple way to "reset" all pixels with the value "NaN" to a
> specified numeric value, e.g. 0?
>

A simple way is to use this macro...

newValue = 0.0;
counter = 0;
for (y = 0; y < getHeight(); y++){
        for (x = 0; x < getWidth(); x++){
                p = getPixel(x,y);
                if (isNaN(p)) {
                        setPixel(x, y, newValue);
                        counter++;
                }
        }
}

print("" + counter + " pixels replaced");


Cheers,
Ben

> I couldn't find a way to do this properly in ImageJ...one ugly  
> workaround I
> came up with is to save the image as text and then simply find &  
> replace all
> occurences of NaN, but that's not a feasible option for large  
> stacks...there
> MUST be a better way.
>
> Thanks!
>
> --
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> Sent from the ImageJ mailing list archive at Nabble.com.