Background correction

[Adam Hacking]

Hi,
 
I have a series of grey scale SEM (BSEM) images where the image becomes progressively brighter in a directional manner.  I cannot obtain a blank image for correction. Is there another method to do this ? I did look about it seems that the pseudo flat field correction plugin might help, but I cannot locate it.
 
Thanks in advance,
 
Adam

[Alan Hewat]

Have you tried "Process/Subtract Background". That seems to work well
for grey-scale images with fine detail and a diffuse brighter corner.
Alan.

On 3 February 2010 14:38, Adam Hacking <[hidden email]> wrote:
> Hi,
>
> I have a series of grey scale SEM (BSEM) images where the image becomes progressively brighter in a directional manner.  I cannot obtain a blank image for correction. Is there another method to do this ? I did look about it seems that the pseudo flat field correction plugin might help, but I cannot locate it.
>
> Thanks in advance,
>
> Adam
______________________________________________
Dr Alan Hewat, NeutronOptics, Grenoble, FRANCE
<[hidden email]> +33.476.98.41.68
        http://www.NeutronOptics.com/hewat
______________________________________________

[Joel Sheffield]

You might also want to look at the FFT bandpass filter.  You can
consider the gradual shading to be a very low frequency wave, and
select that while keeping the high frequency exclusions to zero.

Joel

> Hi,
>  
> I have a series of grey scale SEM (BSEM) images where
> the image becomes progressively brighter in a directional manner.  I
> cannot obtain a blank image for correction. Is there another method
> to do this ? I did look about it seems that the pseudo flat field
> correction plugin might help, but I cannot locate it.
>  
> Thanks in advance,
>  
> Adam
>
>
>
>