These controls appear automatically for collections that carry volumetric / DICOM data; ordinary image collections don’t show them.

## Slice navigation

A scrubber sits at the foot of the viewer. Drag it (or use the **‹ ›** buttons, or **Play** to auto-advance) to move through the stack — `SLICE 122 / 243`. The **SLICE / CORONAL / SAGITTAL** tabs reslice the volume along a different axis.

The slice scrubber — step through the stack and switch reconstruction axis.

## Window / level

Medical images carry far more intensity range than a screen shows, so you pick the window. The **Level / Width** sliders set the centre and span of the displayed range; the **modality preset** dropdown (Default (DICOM), and named tissue presets) jumps to standard windows. Toggling the alt-drag control lets you set window/level by dragging on the image, PACS-style.

The radiology viewer — brain MR slices with the window/level control (Level / Width / preset) and slice scrubber.

Window/level is applied live by the renderer, so every visible slice updates as you drag. A non-default window is captured in the URL for radiology collections, so a link reproduces what you were looking at.

## Segmentation overlays

When a collection was ingested with paired masks, the Inspector’s **Annotations** tab gains a **Segmentation overlay** section. It’s read-only and pre-computed, so every viewer sees it — clinicians without write access still get the curated outline.

The segmentation overlay — toggle it, set opacity, and show/recolour each labelled class.

Toggle the overlay on, set its **opacity**, and show/hide or recolour each labelled class (here Necrosis, Edema, Enhancing Lesion). Colour changes apply immediately and reset on reload.

## Image adjustments

The same Annotations tab carries **brightness, contrast, saturation, hue, and invert** sliders — handy for teasing out detail before reading or annotating. These are display-only and don’t alter the stored image. See [Annotations](/content/docs/annotations/index.html) for the drawing tools alongside them.