Setting 16-bit values

[IJperson]

 

Hi

 

I must be missing something obvious here J

I have a 16-bit image, and want to paint some 16-bit greyscale colours on
it. How do I set a 16-bit greyscale colour to paint with?

The colour dropper won't let me set values above 255 still.

 

Thanks!

Andy

 


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[Michael Schmid]

Hi Andy,

the eyedropper color values are not pixel values but colors as they appear
on the display.
E.g., if you have a 16-bit image with Brightness&Contrast settings to
display values of 0-4095 as black-white, eyedropper white will correspond
to a pixel value of 4095.
Ther won't be an eyedropper color corresponding to, e.g., 4094, however,
because the eyedropper colors have only 8 bits of resolution.

If you want to set pixels to an accurate value, create an area selection
(If you have a line: Image>Selection>Area to Line) and then use
Process>Math>Set.


Michael
_____________________________________________________________

On Fri, September 21, 2012 10:14, Andrew French wrote:

>
>
> Hi
>
>
>
> I must be missing something obvious here J
>
> I have a 16-bit image, and want to paint some 16-bit greyscale colours on
> it. How do I set a 16-bit greyscale colour to paint with?
>
> The colour dropper won't let me set values above 255 still.
>
>
>
> Thanks!
>
> Andy
>
>
>
>
> --
> ImageJ mailing list: http://imagej.nih.gov/ij/list.html
>

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

[Richard VanMetter]

The simplest way to set pixel values for a selected area is with the menu command

>>process>>math>>set...

then you can input any pixel value you wish. No need to set a window/level or anything else.

Rich VanMetter

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[IJperson]

Thanks for the advice.
I used the Create Shortcut option to make a keyboard shortcut for the Set
value to make it more convenient.
Thanks
Andy

-----Original Message-----
From: ImageJ Interest Group [mailto:[hidden email]] On Behalf Of
Michael Schmid
Sent: 22 September 2012 09:26
To: [hidden email]
Subject: Re: Setting 16-bit values

Hi Andy,

the eyedropper color values are not pixel values but colors as they appear
on the display.
E.g., if you have a 16-bit image with Brightness&Contrast settings to
display values of 0-4095 as black-white, eyedropper white will correspond to
a pixel value of 4095.
Ther won't be an eyedropper color corresponding to, e.g., 4094, however,
because the eyedropper colors have only 8 bits of resolution.

If you want to set pixels to an accurate value, create an area selection (If
you have a line: Image>Selection>Area to Line) and then use
Process>Math>Set.


Michael
_____________________________________________________________

On Fri, September 21, 2012 10:14, Andrew French wrote:

>
>
> Hi
>
>
>
> I must be missing something obvious here J
>
> I have a 16-bit image, and want to paint some 16-bit greyscale colours
> on it. How do I set a 16-bit greyscale colour to paint with?
>
> The colour dropper won't let me set values above 255 still.
>
>
>
> Thanks!
>
> Andy
>
>
>
>
> --
> ImageJ mailing list: http://imagej.nih.gov/ij/list.html
>

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

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