Reference

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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

$ gmic 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

$ gmic 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