gregxform(1)

📦
version 3.3.1p2 · 7 versions
, in ubuntu stonking

✨ gregxform ✨

okay bestie, so this is gregxform from the CMTK (The Computational Morphometry Toolkit) squad, and she's a lil utility for slapping coordinate transformations onto big ol' lists of point coordinates 💖

🌸 SYNOPSIS 🌸

gregxform [options] transformation

🦋 DESCRIPTION 🦋

🚨 THIS TOOL IS DEPRECATED. PLEASE USE streamxform INSTEAD. 🚨

Like. she still works, but she's the older sister who's moved on, and the cool new thing is streamxform, ok? Use that. periodt.

So what does she do? She reads a whole list of 3D coordinates and applies a coordinate transformation to them — glow-up for your points, basically ✨ The transformation can optionally be inverted (yes, backwards is an option, we love a reversible moment 💅). The transformed coordinates then get written straight to standard output. iconic.

💅 OPTIONS 💅

👑 Global Toolkit Options (these are shared by all CMTK tools)

like the shared group chat rules, every CMTK tool obeys these:

  • --help — dumps the list of basic command line options to standard output. the starter pack 🎀
  • --help-all — dumps the complete list of basic AND advanced command line options to standard output. the full lore drop 📚
  • --wiki — writes the list of command line options to standard output in MediaWiki markup. for when the wiki needs to know 🫶
  • --man — writes man page source in 'nroff' markup to standard output. manpage-ception, no cap.
  • --version — writes the toolkit version to standard output.
  • --echo — writes the current command line to standard output, so you can see exactly what you typed (we've all been there) 🙈
  • --verbose-level <integer> — sets the verbosity level. how much she talks to you.
  • --verbose, -v — increments the verbosity level by 1. deprecated; it's only still here for backward compatibility, so don't get attached 💀
  • --threads <integer> — sets the maximum number of parallel threads (for POSIX threads and OpenMP). she's multithreaded and she's thriving 🔥

⭐ Main Options

  • --accuracy <double>, -a <double> — approximation accuracy (that's the maximum error). [Default: 0.01]
  • --no-check, -x — disables accuracy checking and always outputs something. chaotic but valid, lowkey 🫣
  • --forward, -f — applies the forward transformation (default is backward, so this is the plot twist).
  • --fallback-inverse <string>, -F <string> — fallback inverse transformation, used for initialization and in case everything goes sideways 💀 [Default: NONE]
  • --input-file <string>, -i <string> — input path [default: STDIN]. [Default: NONE]
  • --output-file <string>, -o <string> — output path [default: STDOUT]. [Default: NONE]
  • --affine, -n — applies the affine transformation even if a warp studylist is specified. she said affine and she means it.
  • --binary, -b — reads binary input and produces binary output (floats). no reading, just vibes in raw bytes 🌈
  • --jacobian, -j — calculates the jacobian determinant rather than mapping the point (default: false). NB: JDet is >1 if the sample volume is larger than the reference — write that one down bestie, it comes up 🧚
  • --normalised-jacobian, -J — calculates the jacobian determinant normalised by the global scaling factor (default: false).
  • --return-global-scaling, -g — returns the global scaling factor, i.e. the scaling due to the initial affine.

🎀 AUTHORS 🎀

Torsten Rohlfing, with contributions from Michael P. Hasak, Greg Jefferis, Calvin R. Maurer, Daniel B. Russakoff, and Yaroslav Halchenko. absolute legends, every single one 👑

📜 LICENSE 📜

http://www.fsf.org/licensing/licenses/gpl.html

💀 BUGS 💀

Report bugs at http://nitrc.org/projects/cmtk/ — she's not perfect and she knows it, tell the devs 🫶

🌸 ACKNOWLEDGMENTS 🌸

CMTK is developed with support from the NIAAA under Grant AA021697, National Consortium on Alcohol and Neurodevelopment in Adolescence (N-CANDA): Data Integration Component. From April 2009 through September 2011, CMTK development and maintenance was supported by the NIBIB under Grant EB008381. funding besties, we love them 🥹💜

okay that's the whole page 💖 this was CMTK 3.3.1p2, dated Jun 24 2026, and gregxform(1) is officially yours to use. go transform something, bestie — but fr fr, use streamxform instead ✨👑🦋

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