getWhiteboardImage

Render a whiteboard to a raster IMAGE so you can SEE it and confirm your edits look right, then iterate — like taking a screenshot. Returns the rendered board as a viewable image attached to the result (always raster: a JPEG light variant and/or a PNG dark variant; there is no vector/SVG output, so for a vector export of a single diagram use getDiagramImage). Pass elementIds to render only specific shapes (e.g. to inspect one section/slide), region:{x,y,width,height} to capture an exact scene-coordinate window (e.g. the user's viewport), theme:'light' for the fastest single-variant render, or background to set the canvas colour. Unchanged boards return instantly from a content-keyed cache. Call this after addWhiteboardElements/updateWhiteboardScene to check layout, overlaps, labels and alignment before continuing.