[MINC-users] Visualizing data with high dynamic range

[Robert D. Vincent]

Hi Andrew,

Display should be able to handle high dynamic range data. There is a global
variable "Convert_volumes_to_byte" which is true by default, but which can
be overridden either on the command line or the Display.globals
initialization file. You can set it either by specifying:

Display -global Convert_volumes_to_byte false <input.mnc>

or by adding the line:

Convert_volumes_to_byte=False;

to a file named Display.globals in your home directory.

Register has similar functionality, but it was added fairly recently, so I
don't believe it is widely available. The code checked into Github supports
two globals, Volume_voxel_type and Volume_voxel_signed, that control the
conversion of loaded volumes.

Hope this helps. I intend to change the default behavior in future versions
of Display, but I haven't made the change yet.

    -bert

On Wed, Aug 5, 2015 at 9:41 AM, Andrew Wood <andrew at biospective.com> wrote:

> Hi all,
>
> I'm having trouble visualizing a volume containing float data with a high
> dynamic range. Both register and Display discretize the signal (down to
> byte precision?), which is not workable for these volumes.
>
> The only solution I have right now is to explode the data into new volumes
> by sliding a reduced range over the signal, clamping away data that
> register and Display can't handle.
>
> Does anyone have experience visualizing high dynamic range data? Is there a
> tool that can do this, or just a better workaround?
>
> Thanks,
> Andrew
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