Viewing

Normal

The default view. Shows a single 2D slice. Scroll to move through slices. h/l changes the scroll dimension; j/k steps one slice at a time.

Multi-view

v — splits the canvas into three orthogonal planes (axial, coronal, sagittal). Drag the crosshair to navigate. Shift+drag for oblique rotation. V opens custom dimension selection; o resets the orientation.

Mosaic

z — lays out a grid of slices along the next dimension. Scrolling then steps through the dimension after that.

Projections

p — cycles through statistical projections along the scroll axis: MAX, MIN, MEAN, STD, SOS.

FFT

f — displays a centered FFT of the array. Prompts for which axes to transform.

RGB

R — renders the array as direct color. The first or last dimension must be size 3 (RGB) or 4 (RGBA). Also available as --rgb on the CLI or rgb=True in Python.

Immersive

F — fullscreen with all chrome hidden. Move the mouse to briefly reveal controls.

Complex data

m — cycles through magnitude, phase, real, and imaginary parts for complex-valued arrays.

Scroll through slices. / opens the special modes shelf for ortho, compare, qMRI, ROI, segmentation, FFT, projections, and overlays. The direct keys still work. 0 resets the zoom. ? shows the full key guide.