## Opening the annotation tools

Click an image to open the Inspector, then switch to the **Annotations** tab. You get the drawing tools, a class picker, image adjustments, and the list of annotations on the current image.

The Annotations tab: adjustment sliders, the drawing tools, and the active class.

## Drawing tools

- **Select** — the default; click an existing annotation to select, move, or delete it.
- **Rectangle** — drag a bounding box.
- **Polygon** — click to place vertices, close the shape to finish.
- **Point** — drop a single marker.

Each new annotation is stamped with the **active class** (below the tools). Annotations are stored with normalized `[0, 1]` coordinates, so they stay correct regardless of image size or zoom.

## Classes

The **class picker** sets what each new annotation means (for example “defect”, “cell”, “vehicle”). Manage the class list — add, rename, recolour — from the class-management control. Classes are collection-wide, so everyone annotating uses the same vocabulary and colours.

## Image adjustments

The same tab carries display adjustments — **brightness, contrast, saturation, hue, invert** — so you can dial in detail before marking a region. For radiology collections this is where window/level lives. Adjustments are view-only; they don’t alter the stored image.

## Tags

Tags are a lighter-weight label than annotations — a flat keyword on the whole image rather than a region. Add and remove them on the Inspector’s **Information** tab. Then filter by tag from the Filters panel — see [Filtering & search](/content/docs/filtering-and-search/index.html).

## Import and export (W3C)

Annotations round-trip through the **W3C Web Annotation** format:

- **Export** them (alongside other formats) from the **Export** panel — see [Exporting](/content/docs/exporting/index.html).
- **Import** existing W3C annotations to overlay them on the matching images.

Because coordinates are normalized, annotations created elsewhere line up as long as they target the same images.