Hi Michael,
Thanks for the tips. The second method would work for me since I'm already running a macro on a stack and shifting coarsely. My colleague Katya Rechav made another suggestion that's a bit more general (at the expense of RAM): set background, then adjust canvas size, shift, and recrop the original. This works because the background is filled as expected, and it's much better than creating a new larger stack.
best,
Michael
________________________________________
From: ImageJ Interest Group [
[hidden email]] on behalf of Michael Schmid [
[hidden email]]
Sent: Monday, September 16, 2013 3:50 PM
To:
[hidden email]
Subject: Re: fill value for Translate...
Hi Michael,
the 'fill' color for the background on Image>Transform>Translate is actually neither white nor black but simply a pixel value of zero (uncalibrated).
If you want to have a different pixel value, you have two possibilities:
(a) Use 32-bit (float) images, subtract a value before translation and add it thereafter
(b) Select the translated area after translation, 'Make Inverse' of the selection and fill that area with the desired value (Process>Math>Set if you have the numeric value). You can easily have a macro for this.
Method (b) won't work well if you translate by a non-integer number of pixels: The border won't be calculated correctly.
Michael
________________________________________________________________
On Sep 16, 2013, at 14:31, Michael Elbaum wrote:
> Thanks Gabriel, but unfortunately white is no better. Creating a larger image with background fill and then pasting the image in should work, but this is bad for memory esp for working with stacks. I tried selecting the desired grey with the color picker but the border remains black after translation.
> regards,
> Michael
>
>
> ________________________________________
> From: ImageJ Interest Group [
[hidden email]] on behalf of Gabriel Landini [
[hidden email]]
> Sent: Friday, September 13, 2013 2:38 PM
> To:
[hidden email]
> Subject: Re: fill value for Translate...
>
> On Friday 13 Sep 2013 12:18:46 you wrote:
>> Dear all, when translating an image the background is filled with black.
>> Is it possible to fill with some other value? for example the mean or the
>> average of the perimeter? thanks,
>> Michael
>
>
> If you do:
>
> Invert
> Translate
> Invert
>
> the background is white (at least in my setup).
>
> Cheers
> Gabriel
>
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