I often scroll through 4-D nifti overlays (ICA components, maps, etc) and I created a volume_select Python script to move quickly to a different overlay. However, every time I move to a new overlay volume, the Darkest and Brightest values do some sort of autoscaling. 

A great option would be to turn off autoscaling and retain the values I set for the Darkest and Brightest values (e.g., for z-scored overlays, Darkest at 1.0 and Brightest at say 4.0 or 5.0). I created another Python script called minmax to set these values, but it doesn't appear that I can keep both volume_select and minmax open for running at the same time, but I don't want to have unload and load the two python scripts. 

I have the Lazarus source code and the Lazarus compiler, and can compile/link source to binary successfully. I haven't coded in Pascal though since the 1980's, but I do know C/C++. Is there some source code I could change/add to the code to add a button box to turn autoscaling on/off?

Also, is there a way to python script finding the max (or min) voxel value in the current overlay? I see there are cluster options, but I'm not sure how to use this to find max or min peak voxel values in an overlay.

Thanks so much,

Chris

I will see if I can extend MRIcroGL. Note that we already have this feature in NiiVue, as shown by the "per-volume contrast" check box in this live demo:

https://niivue.com/demos/features/timeseries2.html

Chris, thanks for the help.

Chris, I used Codex and added the option to turn Darkest/Lightest autoscaling off. Seems to work fine. See attached for Options menu item. So need to add this feature.