Reference

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axes

Arguments:

Description:

Draw xy-axes on selected images.

pattern is an hexadecimal number starting with 0x which can be omitted
even if a color is specified.
To draw only one x-axis at row Y, set both y0 and y1 to Y.
To draw only one y-axis at column X, set both x0 and x1 to X.

Default values:

font_height=14, opacity=1, pattern=(undefined) and color1=0.

Example of use:

$ gmic 400,400,1,3,255 axes -1,1,1,-1
Command: 400,400,1,3,255 axes -1,1,1,-1