did you try right-clicking to set the upper threshold? On Mon, 6 Apr 2009, Lloyd Elliott wrote:

Hi,

I am trying to modify the colour map of an overlay in tksurfer. Unfortunately, the changes I make to the View -> Configure -> Overlay tcl/tk control are either ignored, or end in errors.

For example, if I left click on the histogram to set the lower thresh hold, and then click 'coppy settings to layer', then the thresh hold resets to the original value.

If I change the X Axis Range manually, for example by entering '6' in the Max edit box, then I get something like this error whenever I try to change something:

ERROR updating histo: impossible limits (min 6.73089 >= max 6.73089) for axis "x"

I'm guessing that this is a bug --- that is, it's not that I am misusing these controls.

I just want the brain to be coloured according to the whole range of values in my w file --- ie, for the heat map, the minimum should be the darkest blue and the maximum should be the brightest red (no gray where I guess freesurfer assumes p>whatever --- this overlay is not a statistical test). Any suggestions?

lloyd$ tksurfer --version stable4 lloyd$ uname -a Darwin 307-the-philosophers-foothold.local 9.6.0 Darwin Kernel Version 9.6.0: Mon Nov 24 17:37:00 PST 2008; root:xnu-1228.9.59~1/RELEASE_I386 i386

surfer: current subjects dir: /Users/lloyd/work/subjects surfer: not in "scripts" dir ==> using cwd for session root surfer: session root data dir ($session) set to: surfer: /Users/lloyd surfer: Reading header info from /Users/mathpunk/work/subjects/AAA03/ mri/T1.mgz surfer: vertices=123084, faces=246164

Thanks! L

PS --- a screenshot of these errors: http://mathpunk.churchturing.org/overlay-problems.png

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