Re: Image Thresholding for Binary workflow

Posted by John Hayes on
URL: http://imagej.273.s1.nabble.com/Image-Thresholding-for-Binary-workflow-tp5007850p5007851.html

Hi Rainer,

Check out the ByteProcessor::threshold function:
          Sets pixels less than or equal to level to 0 and all other pixels to 255.

HTH and best regards,

John

Le 22 mai 2014 à 11:23, Rainer M. Engel a écrit :

> Hello together,
>
> I'm looking for way to threshold an image and in the same process making
> it binary.
>
> Process > Binary > Make Binary
> sometimes caused plausible black/white dominance switches.
>
> Process > Math > Macro
> works better for my purposes (i.e.| if (v<=25) v=0; else v=255)
>
> The later Expression is very slow compared even to an Gaussian Blur or
> similar. Are there other, hopefully faster ways (for high resolution) to
> threshold and make binary (8bit)?
>
> I tried ..
> setMinAndMax(173, 173);
> .. but this does no clamping like I thought it might..
>
> Any help is much appreciated.
>
> Best regards,
> Rainer
>
>
> --
> Rainer M. Engel, Dipl. Digital Artist
> scientific|Media GbR
> Pichelsdorfer Str. 143
> 13595 Berlin
>
> --
> ImageJ mailing list: http://imagej.nih.gov/ij/list.html

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