Hi,
The upper limit just sets where the top of the colourscale refers to,
it doesn't carry out any thresholding (removal of voxels from
display). As the manual says, thresholding is only applied regarding
the Min setting.
Steve.
On 23 Feb 2008, at 02:00, Soohyun Cho wrote:
> Hello FSL experts,
>
> I wonder why fslview sometimes shows values of the image that is
> outside the range that I specified in the min max window.
> For example, I loaded one of my thresh_zstats and set min to 0 and
> max to 2, but fslview still showed clusters of voxels with values
> above 3 or 4.
> (The thresh_zstat was not at the bottom of the image list.)
>
> In the FSLview manual, it says:
>
> [The "Min" & "Max" fields(1) display the minimum & maximum value of
> the display range. Unless the image is at the bottom of the Image
> List, any voxels with intensity below the minimum set here will not
> appear, i.e., the image is effectively threshold at "Min" and these
> voxels will be rendered transparent. Note that this is only the case
> when continuous colormaps are in use. Label colour maps do not
> change display with the brightness and contrast settings at all.]
>
> Aren't feat output images (e.g., thresh_zstats) a continuous color
> map?
> What about randomise outputs (e.g., maxc_tstats), aren't they
> continuous color maps?
> Any suggestions on what might be the problem?
>
>
> Thank you for your response.
>
> Soohyun
>
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Stephen M. Smith, Professor of Biomedical Engineering
Associate Director, Oxford University FMRIB Centre
FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
+44 (0) 1865 222726 (fax 222717)
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