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

sub	Built-in command

Arguments:

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

(equivalent to shortcut command -).

<a href="image.jpg" class="highslide" onclick="return hs.expand(this)">image.jpg</a> +sub 30% cut 0,255

Command: <a href="image.jpg" class="highslide" onclick="return hs.expand(this)">image.jpg</a> +sub 30% cut 0,255

<a href="image.jpg" class="highslide" onclick="return hs.expand(this)">image.jpg</a> +mirror x sub[-1] [0]

Command: <a href="image.jpg" class="highslide" onclick="return hs.expand(this)">image.jpg</a> +mirror x sub[-1] [0]

<a href="image.jpg" class="highslide" onclick="return hs.expand(this)">image.jpg</a> sub 'i(w/2+0.9*(x-w/2),y)'

Command: <a href="image.jpg" class="highslide" onclick="return hs.expand(this)">image.jpg</a> sub 'i(w/2+0.9*(x-w/2),y)'

<a href="image.jpg" class="highslide" onclick="return hs.expand(this)">image.jpg</a> +mirror x sub

Command: <a href="image.jpg" class="highslide" onclick="return hs.expand(this)">image.jpg</a> +mirror x sub