# ITK-SNAP Shortcuts

Image Operations
Alt-I | Adjust image contrast automatically
Ctrl-I | Show image contrast window
S | Hide/reveal segmentation
A | Increase segmentation transparency
D | Decrease segmentation transparency
Tool Selection Commands
1 | Crosshairs tool
2 | Zoom/pan tool
3 | Polygon tool
4 | Automatic segmentation (SnAP region) tool
5 | Paintbrush tool
Slice Window Commands (cursor must be in a slice window)
PgUp | Show next slice in current slice window (mouse must be inside)
PgDn | Show previous slice in current slice window
Arrow keys | Move cursor left, right, up, down by one voxel
Shift+Arrow keys | Move cursor by five voxels
3D Window Commands (cursor must be in the 3D window)
S | Store current viewpoint
R | Recall stored viewpoint
File Operations
Ctrl-G | Open gray image
Ctrl-1 ... Ctrl-5 | Open gray image from recently loaded list (1 = most recent)
Ctrl-D | Open segmentation image
Ctrl-S | Save segmentation image
Ctrl-N | Create new segmentation image (clear segmentation)
Ctrl-Q | Exit program
Paint Brush Mode
-(_) | Decrease paint brush size
+(=) | Increase paint brush size
Changing Active/DrawOver Label
,(<) | Select the previous active label in the list
.(>) | Select the next active label in the list
Ctrl-,(<) | Select the previous drawover label in the list
Ctrl-.(>) | Select the next drawover label in the list