Re: How to find percentiles of intensity

Posted by Michael Schmid on Jan 20, 2015; 9:30am
URL: http://imagej.273.s1.nabble.com/How-to-find-percentiles-of-intensity-tp5011293p5011295.html

Hi Avital,

did you have a look at Process>Enhance contrast? There you can specify the percentage of saturated pixels. If you specify 1%, it will be 0.5% dark pixels becoming saturated black and 0.5% bright pixels becoming saturated white.

  http://rsb.info.nih.gov/ij/docs/guide/146-29.html#toc-Subsection-29.5

For grayscale images, this only changes the lookup table. In the Brightness&Contrast panel, you can recover the original display with 'Reset' or make it a permanent change with 'Apply' (the latter only for 8-bit and color images).

Michael
________________________________________________________________
On Jan 20, 2015, at 07:41, Avital Steinberg wrote:

> Hi,
> I would like to perform contrast stretching for an 8-bit image. When I use
> set min and max, it gives me 0-255. (which does absolutely nothing in terms
> of contrast stretching) When I check in ImageJ what values are used, it
> looks like it takes 0 as min and 105 as max for a specific image that I
> examined.
>
> So my question is:
>
> Is it possible to get less extreme values of the intensity values in order
> to ignore the outliers, say the 5th and 95th percentiles of the intensity
> values? If so - how?
>
> Thank you,
> Avital

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