invert black and white values

[Abi]

Hi,
I've only just downloaded image J and this is probably a really silly question, sorry!
I'm trying to set the threshold for an image, a black image on a white background.  I want the black values to have a count of 255 and the white of 0, but it's coming up the other way round.  When I use the computer at work it comes up the way I want it.
Can anyone tell me what I'm doing wrong please?
Thanks
A

[Jean-Philippe Grossier]

Hi,

you can do: edit>invert. all previous black values are now 255 and white.
you can then invert the display color in image>lookup table>invert lut to
change white to black without changing the values.

jp


2013/4/28 Abi <[hidden email]>

> Hi,
> I've only just downloaded image J and this is probably a really silly
> question, sorry!
> I'm trying to set the threshold for an image, a black image on a white
> background.  I want the black values to have a count of 255 and the white
> of
> 0, but it's coming up the other way round.  When I use the computer at work
> it comes up the way I want it.
> Can anyone tell me what I'm doing wrong please?
> Thanks
> A
>
>
>
> --
> View this message in context:
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> Sent from the ImageJ mailing list archive at Nabble.com.
>
> --
> ImageJ mailing list: http://imagej.nih.gov/ij/list.html
>

... [show rest of quote]

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[Michael Schmid]

Hi Abi,

if it works differently on different computers, it seems you have
different settings of 'Black Background' in Process>Binary>Options.

Michael
_____________________________________________________________________

On Sun, April 28, 2013 08:37, Abi wrote:

> Hi,
> I've only just downloaded image J and this is probably a really silly
> question, sorry!
> I'm trying to set the threshold for an image, a black image on a white
> background.  I want the black values to have a count of 255 and the white
> of
> 0, but it's coming up the other way round.  When I use the computer at
> work
> it comes up the way I want it.
> Can anyone tell me what I'm doing wrong please?
> Thanks
> A

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[Abi]

Hi JP
Thanks that worked! I was doing them each separately and it never occurred to me I needed to do both!
Abi