Connecting...
{cmd,ctrl,shift}+o · drop to open array
A − B
`{cmd,ctrl,shift}+o` · drop to open array
Space to select · Enter to open
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Navigation
scroll prev / next slice
h / l / ← / →move cursor to prev / next dim (shows dim progress briefly)
j / k / ↓ / ↑prev / next index; reverse direction on spatial dims
0–9 + Enter jump to slice index (type number, press Enter)
r reverse active axis direction
R toggle RGB mode on active dim (size 3 or 4)
Space toggle auto-play
+ / -zoom in / out
0 reset zoom (fit to window)
Axes & Views
x swap horizontal dim with slice dim
y swap vertical dim with slice dim
z claim dim as z (grid), scroll through next dim
v toggle 3-plane view (dims 0,1,2); in compare mode: rows × 3-planes grid
V toggle 3-plane view (custom dims); in compare mode: same as v
o reset oblique slices and crosshair to center (3-plane view)
q qMRI mode — toggle compact / full view; also works in compare mode (rows × maps grid)
Display
b toggle canvas border
p stretch panes to square box (3-plane view)
A toggle rectangle ROI mode — drag canvas to select region and show stats
c cycle colormap
C enter matplotlib colormap name
d cycle dynamic range
D set vmin / vmax manually (locked until next d)
colorbar drag shift window level left / right
colorbar scroll zoom window (narrow / widen range)
colorbar dblclick reset window / level to auto
w Lebesgue mode — hover colorbar to highlight pixels in that value bin
P open picker in Compare mode (Tab cycles Open / Compare / Overlay)
Cmd+O open picker (also Ctrl+O, Shift+O) — Space selects, Enter opens (1 sel) or compares (2–4 sel)
R toggle registration overlay mode (compare)
[ / ]overlay transparency (overlay mode), registration blend (R in compare), or arrow density (vector field mode)
{ / }arrow length shorter / longer (vector field mode)
n cycle compare target session
panel title drag drag a compare panel title to swap pane order
Z focus diff/overlay pane (in X or R mode)
L toggle log scale
M cycle mask threshold (Otsu)
m cycle complex mode (mag / phase / real / imag)
f toggle centred FFT (prompts for axes)
T cycle theme: dark / light / solarized / nord
Info & Export
hover show pixel value on colorbar
H toggle pixel hover tooltip
i show data info overlay
s save screenshot (PNG → Downloads)
N export current slice as .npy (→ Downloads)
g save GIF of current slice dim
e copy reusable URL
?toggle this help