A basic gallery can be added by selecting a namespace like this:
{{gallery>namespace}}
All imagefiles in the selected namespace will be added to the image gallery.
You can define the wanted thumbnail size by adding its dimension as parameter:
{{gallery>namespace?150x150}}
The default is a dimension of 120×120 pixels.
You can define the number of columns as well:
{{gallery>namespace?6}}
The default number of columns is 5. If you specify a 0 no table is used instead all thumbnails are added in a sequence.
To have the filename displayed below the thumbnails add the showname parameter:
{{gallery>namespace?showname}}
If you want the files sorted in the reverse order use the reverse keyword:
{{gallery>namespace?reverse}}
If you don't want to link to the image detail pages but directly to the image itself use the direct parameter:
{{gallery>namespace?direct}}
For fancy JavaScript based inline browsing of the images use the lightbox keyword 1). This feature implicitly sets the direct parameter.
{{gallery>namespace?lightbox}}
All params can be combined:
{{gallery>namespace?150x150&6&showname}}