---
name: "cmtk-gregxform"
section: "1"
platform: "linux"
package: "cmtk"
version: "3.3.1p2+dfsg-3"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/cmtk-gregxform"
---

# cmtk-gregxform(1)

Apply coordinate transformations to lists of point coordinates

## NAME

gregxform - Apply coordinate transformations to lists of point coordinates

## SYNOPSIS

gregxform \[options\] transformation

## DESCRIPTION

THIS TOOL IS DEPRECATED. PLEASE USE streamxform INSTEAD.

This tool reads a list of 3D coordinates and applies a coordimnate transformation to them. The transformation can optionally be inverted. The transformed coordinates are then written to standard output.

## OPTIONS

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

- **--help**

  Write list of basic command line options to standard output.

- **--help-all**

  Write complete list of basic and advanced command line options to standard output.

- **--wiki**

  Write list of command line options to standard output in MediaWiki markup.

- **--man**

  Write man page source in 'nroff' markup to standard output.

- **--version**

  Write toolkit version to standard output.

- **--echo**

  Write the current command line to standard output.

- **--verbose-level** *\<integer\>*

  Set verbosity level.

- **--verbose**, **-v**

  Increment verbosity level by 1 (deprecated; supported for backward compatibility).

- **--threads** *\<integer\>*

  Set maximum number of parallel threads (for POSIX threads and OpenMP).

### Main Options

- **--accuracy** *\<double\>*, **-a** *\<double\>*

  Approximation accuracy (maximum error) **\[Default: 0.01\]**

- **--no-check**, **-x**

  Disable accuracy checking and always output something

- **--forward**, **-f**

  Apply forward transformation (default: backward)

- **--fallback-inverse** *\<string\>*, **-F** *\<string\>*

  Fallback inverse transformation (used for initialization and in case of failure) **\[Default: NONE\]**

- **--input-file** *\<string\>*, **-i** *\<string\>*

  Input path \[default: STDIN\].  **\[Default: NONE\]**

- **--output-file** *\<string\>*, **-o** *\<string\>*

  Output path \[default: STDOUT\].  **\[Default: NONE\]**

- **--affine**, **-n**

  Apply affine transformation even if warp studylist specified

- **--binary**, **-b**

  Read Binary input and produce binary output (floats)

- **--jacobian**, **-j**

  Calculate jacobian determinant rather than mapping point (default: false)					\
   	NB: JDet is \>1 if the sample volume is larger than the reference

- **--normalised-jacobian**, **-J**

  Calculate jacobian determinant normalised by global scaling factor (default: false)

- **--return-global-scaling**, **-g**

  Return global scaling factor ie the scaling due to initial affine

## AUTHORS

Torsten Rohlfing, with contributions from Michael P. Hasak, Greg Jefferis, Calvin R. Maurer, Daniel B. Russakoff, and Yaroslav Halchenko

## LICENSE

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

## BUGS

Report bugs at http://nitrc.org/projects/cmtk/

## 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.