Can you record dual camera video in black and white on iPhone?
Yes — one of the six live filters, called Mono, removes color from the frame entirely, and it works exactly like every other filter in a dual-camera recording: it is applied on the GPU as the two camera images are composited, so what you see in the viewfinder in black and white is what gets written to the file. There is no separate black-and-white “mode” distinct from the filter system — Mono is a filter alongside None, Vivid, Warm, Cool and Film, sitting in the same picker.
What is worth understanding is less “does it exist” and more how it behaves in a frame built from two cameras at once: it applies to the whole canvas rather than to one camera, it can be turned on or off mid-recording, and shooting well for it takes a different habit than shooting well for color.
Where Mono sits among the six filters
DualCam’s live filters are None, Vivid, Warm, Cool, Mono and Film, and Mono is the one that removes color specifically — Vivid, Warm, Cool and Film each apply their own tonal treatment but keep the frame in color, which makes Mono the single monochrome option in the list.
Like the rest, it runs inside the shader that composites the two camera feeds into one frame, not as a filter layered on afterward. That means turning it on costs nothing extra to render — it is the same compositing work with a different color transform inside it — and it is genuinely live: the preview you are looking at while Mono is selected is the exact frame being written to the file at that instant.
It colors the whole frame, not one camera
A dual-camera recording draws the front and back images into a single canvas before anything else happens to them, and a filter runs on that already-merged frame. There is no way to make the main frame color and the picture-in-picture inset black and white, or the reverse — Mono, like every other filter, is one setting for the entire recording, because by the time it has anything to color, the two source images are no longer separate.
That single-setting behavior has one real upside worth knowing. Because Mono removes color from both halves identically, it also removes the one dimension where the front and back camera most often visibly disagree. The two cameras run independent automatic white balance and can land on slightly different color casts under mixed lighting — see the guide on why the front camera looks a different color than the back camera for the mechanics — and going monochrome takes that particular disagreement off the table, without fixing exposure or framing differences, which are separate problems.
Shooting for contrast instead of color
Once color is gone, the picture reads through contrast, texture and where the light falls, which is not something a filter manages for you. A face lit flat and evenly reads as a featureless gray oval in monochrome the same way it looks flat in color, just without hue to distract from it — a single light source coming from an angle, even a window off to one side, does more for a black-and-white dual recording than for a color one.
The same applies to whatever the back camera is pointed at. Texture that color would normally carry — brick, fabric, skin, foliage — has to be read through light and shadow alone once hue is removed, so scenes with strong directional light or clear tonal separation between subject and background hold up noticeably better in Mono than scenes lit flat and evenly.
Turning it on and off mid-recording
Mono sits with layout, the picture-in-picture corner, its size and shape, and every other filter in the group of settings DualCam leaves open while the camera is rolling — unlike resolution, mute and the countdown, which lock the instant recording starts. That means switching into black and white partway through a take, to mark a change in mood or a cut point you plan to make later, is something you can actually do live rather than plan for in advance.
The trade-off is that it is genuinely permanent once written. Because the composited frame is the recording, with no separate render pass afterward, a section shot in Mono cannot be pulled back into color, and a color section cannot be pulled back into Mono — only forward, from whatever the filter picker is set to at that moment.
Common follow-up questions
Is Mono the only black-and-white option among the filters?
Yes. Of the six — None, Vivid, Warm, Cool, Mono and Film — Mono is the one that removes color from the frame. The other four keep the recording in color, each with its own tonal treatment.
Can I switch out of black and white partway through a recording?
Yes. The filter is one of the settings DualCam leaves changeable while recording is in progress, along with layout, the picture-in-picture corner, its size and shape. Resolution, mute and the countdown are the ones that lock at the start.
Does black and white apply to only the main camera or only the inset?
Neither — it applies to the whole composited frame. A filter runs after the two camera images are already drawn into one canvas, so there is no way to make one half color and the other monochrome.
Can I convert an already-recorded color dual camera video to black and white afterward instead?
Yes, with an ordinary video editor — desaturating a finished MP4 is a standard edit that does not need the two camera feeds to still be separate, unlike undoing the layout or swapping which camera is the main view. It just will not be the same live, in-shader look Mono produces while recording.
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