B&C settings in threshold windows

[CARL Philippe (LBP)]

Dear all,

When either opening or putting a Threshold window in focus the Brightness
and/or Contrast settings that may have been previously modified get reset.

Unfortunately it may sometimes be interesting (and sometimes even needed) to
modify the Brightness and/or Contrast settings of a picture in order to
better identify some of its features.

Is this resetting of the Brightness and/or Contrast settings in the
Threshold window a feature added in purpose or rather a bug?

My best regards,

Philippe

 

Philippe CARL

Laboratoire de Biophotonique et Pharmacologie

UMR 7213 CNRS - Université de Strasbourg

Faculté de Pharmacie

74 route du Rhin

67401 ILLKIRCH

Tel : [phone]

 


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[Michael Schmid]

Hi Philippe,

adjusting a threshold without resetting B&C is also on my wishlist since quite a while, so I have had a look at it and it seems that it is not very easy to implement.

The nicest way to do it would be using an overlay for the threshold instead of manipulating the LUT (these days it would be fast enough), but this would be a lot of work and I don't know whether it wouldn't break some old macros. An overlay would also have the advantage of full accuracy for 16-bit and float data.

Michael
________________________________________________________________
On Jul 15, 2014, at 15:34, Philippe CARL wrote:

> Dear all,
>
> When either opening or putting a Threshold window in focus the Brightness
> and/or Contrast settings that may have been previously modified get reset.
>
> Unfortunately it may sometimes be interesting (and sometimes even needed) to
> modify the Brightness and/or Contrast settings of a picture in order to
> better identify some of its features.
>
> Is this resetting of the Brightness and/or Contrast settings in the
> Threshold window a feature added in purpose or rather a bug?
>
> My best regards,
>
> Philippe

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[Glen MacDonald-2]

Hi Philippe,
Would it work to adjust B&C to increase constrast of interesting features then click on ‘Apply’ before thresholding, or adjusting threshold? the downside is that altering intensities may add unwanted features to the threshold.


Glen MacDonald
        Core for Communication Research
Virginia Merrill Bloedel Hearing Research Center
        Cellular Morphology Core
Center on Human Development and Disability
Box 357923
University of Washington
Seattle, WA 98195-7923  USA
[phone]
[hidden email]







On Jul 15, 2014, at 6:34 AM, Philippe CARL <[hidden email]> wrote:

> Dear all,
>
> When either opening or putting a Threshold window in focus the Brightness
> and/or Contrast settings that may have been previously modified get reset.
>
> Unfortunately it may sometimes be interesting (and sometimes even needed) to
> modify the Brightness and/or Contrast settings of a picture in order to
> better identify some of its features.
>
> Is this resetting of the Brightness and/or Contrast settings in the
> Threshold window a feature added in purpose or rather a bug?
>
> My best regards,
>
> Philippe
>
>
>
> Philippe CARL
>
> Laboratoire de Biophotonique et Pharmacologie
>
> UMR 7213 CNRS - Université de Strasbourg
>
> Faculté de Pharmacie
>
> 74 route du Rhin
>
> 67401 ILLKIRCH
>
> Tel : [phone]
>
>
>
>
> --
> ImageJ mailing list: http://imagej.nih.gov/ij/list.html

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[Stoyan Pavlov]

Hi there,
It would be an useful feature indeed.
In the meantime I started to use the following workaround (i know it's
static and lacks interactivity but it works for me good enough): I do the
thresholding and then I use create selection, which I add to either
RoiManager or to overlay. Then I can reset the LUT and play with the B&C in
order to see how the threshold worked.
Stoyan
На 15.07.2014 21:47 "Glen MacDonald" <[hidden email]> написа:

> Hi Philippe,
> Would it work to adjust B&C to increase constrast of interesting features
> then click on ‘Apply’ before thresholding, or adjusting threshold? the
> downside is that altering intensities may add unwanted features to the
> threshold.
>
>
> Glen MacDonald
>         Core for Communication Research
> Virginia Merrill Bloedel Hearing Research Center
>         Cellular Morphology Core
> Center on Human Development and Disability
> Box 357923
> University of Washington
> Seattle, WA 98195-7923  USA
> [phone]
> [hidden email]
>
>
>
>
>
>
>
> On Jul 15, 2014, at 6:34 AM, Philippe CARL <[hidden email]>
> wrote:
>
> > Dear all,
> >
> > When either opening or putting a Threshold window in focus the Brightness
> > and/or Contrast settings that may have been previously modified get
> reset.
> >
> > Unfortunately it may sometimes be interesting (and sometimes even
> needed) to
> > modify the Brightness and/or Contrast settings of a picture in order to
> > better identify some of its features.
> >
> > Is this resetting of the Brightness and/or Contrast settings in the
> > Threshold window a feature added in purpose or rather a bug?
> >
> > My best regards,
> >
> > Philippe
> >
> >
> >
> > Philippe CARL
> >
> > Laboratoire de Biophotonique et Pharmacologie
> >
> > UMR 7213 CNRS - Université de Strasbourg
> >
> > Faculté de Pharmacie
> >
> > 74 route du Rhin
> >
> > 67401 ILLKIRCH
> >
> > Tel : [phone]
> >
> >
> >
> >
> > --
> > ImageJ mailing list: http://imagej.nih.gov/ij/list.html
>
> --
> ImageJ mailing list: http://imagej.nih.gov/ij/list.html
>

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