Output Preview

The Output Preview is a floating, draggable window that shows a live picture of one screen straight from the engine — either the screen's content before any projection correction, or what its output really renders, warp and blend included. No NDI monitor or physical display connection is needed.

Opening the Preview

Click the Preview button (monitor icon) in the header toolbar. The button lights up while the preview is open. Click it again, or × in the window, to close it.

The preview stays open when you move between the Editor, Control and User views.

Comp and Output

The two buttons in the title bar choose what you see; the badge in the status bar says which one is on.

Mode	What it shows
Comp (badge Pre-warp)	The screen's composed picture — the content in its fields, before any calibration, warp, edge blend or black level. This is the default.
Output (badge Output)	The picture as the screen's first output on this machine renders it — with the VIOSO calibration or the Projection Setup applied. Use it to check a warp or a blend from your desk.

Controls

Control	Description
Screen	Which screen the preview shows.
Open in new tab (↗)	Opens the screen's live stream in its own browser tab — a URL that also works in another browser or in streaming software.
Frame rate	1, 2, 5, 10 or 30 fps — how often a new picture is fetched. Lower rates reduce engine and network load. Starts at 5 fps, the rate of the screen pictures on the Stage and in VIOSO Spaces.
Resolution	Width 400, 640 or 800 px; the height follows the screen's aspect ratio. Starts at 640 px, like the Stage's screen pictures.
Quality	JPEG quality of each picture — Low / Medium / High / Max. Lower quality reduces bandwidth and decode cost. Starts at Medium.
Outlines (icon toggle)	(Output mode) Switches the on-wall Outlines — every screen's and field's box drawn on the real outputs. It is the same rig-wide switch as Outlines in the Stage header.
Interactive mode	(Comp and Output mode) Clicks on the picture are passed to a Web Capture source, so a web page on the output can be operated from here.
Layout Designer	Toggles the inline Layout Designer overlay on top of the preview. When on, every positionable clip of the screen that is active at the timeline locator becomes a draggable, resizable box.
− / + / Reset	Zoom the picture out and in, or reset zoom and pan to fit. The mouse wheel zooms; drag pans when zoomed in.
Drag	Drag the title bar to move the window anywhere in the browser
Resize	Drag the bottom-right corner

Layout Designer Overlay

Click the Layout Designer button in the preview's header to enable an inline editor that lets you move, resize, and rotate every positionable item of the selected screen by eye, with the live preview as the backdrop. The designer respects the preview's zoom and pan, so you can zoom in to pixel-tune a small element. See the dedicated Layout Designer page for the full toolbar reference and keyboard shortcuts.

Connection Status

The dot and text in the status bar show the connection state:

Colour	Text	Meaning
Green	Receiving frames	Pictures are arriving from the engine
Amber	Connection issues — retrying…	Several requests in a row failed; it keeps retrying
Red	No signal	No picture yet — the engine has not answered, or no screen is selected

Performance Notes

• The preview fetches single pictures from the engine at the selected frame rate. It is not a video stream (the Open in new tab stream is).
• It stops fetching while the browser tab is hidden and resumes when you come back.
• Closing the preview stops all fetching immediately.

Tip: Use 1 or 2 fps for a "confidence monitor" that lets you verify output without any noticeable performance impact.

Intended Uses

• Remote operation: Verify the engine output from a laptop or tablet without a dedicated HDMI monitor.
• Rehearsal: Quickly check that the right media is playing on the right screen.
• Projection: Compare Comp and Output to see what the calibration or the Projection Setup does to the picture — see Projection Mapping.