Reference

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sub

Built-in command

Arguments:

Description:

Subtract specified value, image or mathematical expression to selected images, or compute the pointwise difference of selected images.

(equivalent to shortcut command -).

Examples of use:

• Example #1

$ gmic image.jpg +sub 30% cut 0,255

Command: image.jpg +sub 30% cut 0,255
Command: image.jpg +sub 30% cut 0,255

• Example #2

$ gmic image.jpg +mirror x sub[-1] [0]

Command: image.jpg +mirror x sub[-1] [0]
Command: image.jpg +mirror x sub[-1] [0]

• Example #3

$ gmic image.jpg sub 'i(w/2+0.9*(x-w/2),y)'

Command: image.jpg sub 'i(w/2+0.9*(x-w/2),y)'

• Example #4

$ gmic image.jpg +mirror x sub

Command: image.jpg +mirror x sub