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  ▸  Mathematical Operators  ▸  atan◀  asinh    |    atan2  ▶

atan

Built-in command

No arguments

Description:

Compute the pointwise arctangent of selected images.

This command has a tutorial page.

Examples of use:

• Example #1

image.jpg +normalize 0,8 atan[-1]

Command: image.jpg +normalize 0,8 atan[-1]
Command: image.jpg +normalize 0,8 atan[-1]

• Example #2

300,1,1,1,'4*x/w+u' +atan display_graph 400,300

Command: 300,1,1,1,'4*x/w+u' +atan display_graph 400,300
Command: 300,1,1,1,'4*x/w+u' +atan display_graph 400,300
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.