Auto Threshold "Don't Reset Range" -- what does it do?

[robert atwood]

Hi,
I have found a new tickbox in autothreshold, 'Don't reset Range'
What does it do?
I can find a lot of posts via websearch on some forums about various bugs in the behaviour being fixed, but I don't quite understand with the intended underlying purpose of it is?

(it might be useful to me!)
Thanks
Robert


 


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[Michael Schmid]

Hi Robert,

the option 'Don't reset range' is for 16-bit and floating-point images
(32 bits) viewed with modified (typically increased) contrast.
Without that option, thresholding resets the Brightness&Contrast. If you
want to set the threshold based on some faint detail that can't be seen
at the default contrast settings, one can select 'Don't reset range' and
set the contrast with B&C to make that detail visible, then select the
threshold.

Beware that the histogram used for auto-thresholding will not contain
the full range when B&C limits the display range. So with 'Don't reset
range' on, the result of auto-thresholding will depend on the B&C
settings.

I guess that the 'Don't reset range' option came in version 1.52e. From
the Release notes:
    The "Threshold" tool no longer resets the display range of 16-bit and
32-bit images.


Michael
________________________________________________________________


On 2019-02-13 16:39, [hidden email] wrote:

> Hi,
> I have found a new tickbox in autothreshold, 'Don't reset Range'
> What does it do?
> I can find a lot of posts via websearch on some forums about various
> bugs in the behaviour being fixed, but I don't quite understand with
> the intended underlying purpose of it is?
>
> (it might be useful to me!)
> Thanks
> Robert
>

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ImageJ mailing list: http://imagej.nih.gov/ij/list.html