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Re: Negative values

Posted by Herbie on Apr 08, 2019; 9:08am
URL: http://imagej.273.s1.nabble.com/Negative-values-tp5022009p5022010.html

Good day,

are these CT images in DICOM format?

They may be converted to 32bit. Please check the subtitle of your images in
ImageJ, i.e. the line where the image dimensions, bit depth and file size
are listed.

What does "ImageJ >> Show Info" tell you?

Also have a look at
<https://imagej.nih.gov/ij/docs/guide/146-28.html#infobox:DisplayRangeDICOM>
although some changes were made more recently:
Search for DICOM in
<https://imagej.nih.gov/ij/notes.html>

What version of ImageJ are you using?

Regards

Herbie

:::::::::::::::::::::::::::::::::::::

I am opening some images to make densities and noise numbers. The problem I
have is that when I open the image (16 bits) "values" appear in negative.
For example, outside my sample (is all black) shows -1000 value.

The histogram that is showed when I make a ROI is on scale that includes
negative values.


thank you so much.



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