G'MIC - GREYC's Magic for Image Computing: A Full-Featured Open-Source Framework for Image Processing
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A Full-Featured Open-Source Framework for Image Processing

Latest stable version: 3.5.5        Current pre-release: 3.6.0 (2025/08/04)

Reference
Table of Contents  ▸  List of Commands  ▸  Warpings  ▸  transform_polar◀  symmetrize    |    twirl  ▶

transform_polar

Arguments:

  • "expr_radius",_"expr_angle",_center_x[%],_center_y[%],_boundary_conditions={ 0:Dirichlet | 1:Neumann | 2:Periodic | 3:Mirror }

Description:

Apply user-defined transform on polar representation of selected images.

Default values:

expr_radius=R-r, expr_rangle=a, center_x=center_y=50% and boundary_conditions=3.

Example of use:

image.jpg +transform_polar[0] R*(r/R)^2,a +transform_polar[0] r,2*a

Command: image.jpg +transform_polar[0] R*(r/R)^2,a +transform_polar[0] r,2*a
Command: image.jpg +transform_polar[0] R*(r/R)^2,a +transform_polar[0] r,2*a
Command: image.jpg +transform_polar[0] R*(r/R)^2,a +transform_polar[0] r,2*a
G'MIC - GREYC's Magic for Image Computing: A Full-Featured Open-Source Framework for Image Processing

G'MIC is an open-source software distributed under the CeCILL free software licenses (LGPL-like and/or
GPL-compatible). Copyrights (C) Since July 2008, David Tschumperlé - GREYC UMR CNRS 6072, Image Team.