AFNI Message Board

Dear AFNI users-

We are very pleased to announce that the new AFNI Message Board framework is up! Please join us at:

https://discuss.afni.nimh.nih.gov

Existing user accounts have been migrated, so returning users can login by requesting a password reset. New users can create accounts, as well, through a standard account creation process. Please note that these setup emails might initially go to spam folders (esp. for NIH users!), so please check those locations in the beginning.

The current Message Board discussion threads have been migrated to the new framework. The current Message Board will remain visible, but read-only, for a little while.

Sincerely, AFNI HQ

History of AFNI updates  

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October 06, 2009 01:25PM
> The traditional approach of storing all volume masks in a standard AFNI .HEAD/.BRIK file format would take much space (1e5 full-brain subbrik volumes, which would mean about 10-100GB of data using bytes) and is inefficient as almost all values would be zero (not in the mask).

Using compression works extremely well with masks. (I think gzip includes run-length compression) For example a compressed mask can save 98.9% of disk space compared to an uncompressed mask:

3dcalc -datum byte -a TT_icbm452+tlrc. -expr 'step(a)'
++ 3dcalc: AFNI version=AFNI_2008_07_18_1710 (Jul 14 2009) [64-bit]
++ Authored by: A cast of thousands
++ Output dataset ./calc+tlrc.BRIK

gzip -v calc+tlrc.BRIK
calc+tlrc.BRIK: 98.9% -- replaced with calc+tlrc.BRIK.gz

--judd
Subject Author Posted

Support for multiple sparse volume masks?

Nick October 06, 2009 08:37AM

Re: Support for multiple sparse volume masks?

bob cox October 06, 2009 10:33AM

Re: Support for multiple sparse volume masks?

Nick Oosterhof October 06, 2009 11:49AM

Re: Support for multiple sparse volume masks?

Judd October 06, 2009 04:00PM

Re: Support for multiple sparse volume masks?

Nick Oosterhof October 07, 2009 07:33AM

Re: Support for multiple sparse volume masks?

Judd October 07, 2009 10:26AM

Re: Support for multiple sparse volume masks?

Daniel Glen October 07, 2009 12:04PM

Re: Support for multiple sparse volume masks?

Nick Oosterhof October 07, 2009 01:25PM

Re: Support for multiple sparse volume masks?

bob cox October 07, 2009 03:12PM

Re: Support for multiple sparse volume masks?

Nick Oosterhof October 07, 2009 03:49PM

Re: Support for multiple sparse volume masks?

Nick October 07, 2009 10:03PM

Re: Support for multiple sparse volume masks?

Judd October 08, 2009 11:58AM

Re: Support for multiple sparse volume masks?

Judd October 08, 2009 12:06PM

Re: Support for multiple sparse volume masks?

Nick Oosterhof October 08, 2009 01:07PM

Re: Support for multiple sparse volume masks?

Nick Oosterhof October 08, 2009 01:06PM

Re: Support for multiple sparse volume masks?

Judd October 08, 2009 01:44PM

Re: Support for multiple sparse volume masks?

Nick Oosterhof October 08, 2009 03:42PM

Re: Support for multiple sparse volume masks?

Judd October 08, 2009 04:39PM

Re: Support for multiple sparse volume masks?

Nick Oosterhof October 09, 2009 12:34PM

Re: Support for multiple sparse volume masks?

bob cox October 06, 2009 04:02PM

Re: Support for multiple sparse volume masks?

Nick Oosterhof October 07, 2009 07:47AM

Re: Support for multiple sparse volume masks?

Judd October 06, 2009 01:25PM

Re: Support for multiple sparse volume masks?

Nick Oosterhof October 06, 2009 01:49PM

Re: Support for multiple sparse volume masks?

Rasmus Birn October 06, 2009 04:13PM

Re: Support for multiple sparse volume masks?

Nick Oosterhof October 07, 2009 07:37AM