A four-camera panel show and the shading problem we solved

A studio that looked fine until it went live

Marcus runs a small streaming studio on the outskirts of Lincoln, producing a weekly panel programme for a regional business audience. When he first rang us in mid autumn, he described the problem in one sentence: every camera looked acceptable on its own, but the moment the vision mixer cut between them, the guests seemed to change skin tone and the set seemed to change colour.

He had four cameras of two different generations, bought over several years as budget allowed. The picture from each was perfectly usable. The trouble was the cut, which drew the eye to differences that no one noticed on a single shot. Viewers had started mentioning it in comments, politely but repeatedly, and Marcus felt it undermined an otherwise well-written show.

I visited on a recording day to see the problem as the audience saw it, rather than rely on a description. Watching a rehearsal on the studio monitors, the mismatch was obvious within a minute. Cameras two and four leaned warm, camera one was slightly cold, and exposure drifted whenever a guest leaned forward under the key light.

What we found when we looked properly

Before touching a single setting, we spent an hour simply observing. We checked that every camera was set to the same white balance mode, which they were not: two sat on automatic and quietly hunted whenever a guest moved. We also found that the studio's lights were a mix of older tungsten units and newer LED panels, so the colour of the room itself was inconsistent.

Marcus had assumed the cameras were at fault and was half expecting us to recommend replacing two of them. In fact the bodies were fine. The mismatch came from automatic settings fighting a mixed light source, with nobody in the control room able to correct anything while the show ran.

That last point mattered most. He operated the vision mixer himself and was also producing, so there was no spare pair of hands to adjust exposure live. A fix that relied on someone riding the cameras throughout a ninety minute recording was never going to hold.

• Two cameras left on automatic white balance
• Mixed tungsten and LED light across the set
• No one free to adjust cameras during recording

Putting the cameras under one set of hands

Our first change was to bring control of the cameras into one place. Two of the four sat on fixed mounts at the back of the room, awkward to reach. We fitted remote heads and a control panel beside the vision mixer, so pan, tilt, zoom and the main picture settings could all be managed from the producer's seat without anyone walking onto the floor.

We then locked every camera to manual white balance and exposure, set against a single reference taken under the studio lights at their normal show levels. Automatic modes are useful on location, but in a controlled room they only create drift. Fixed values meant the picture stayed put whatever the guests did.

Marcus was wary at first that remote control would feel fiddly. We kept the layout simple: presets for the wide shot, each guest and the presenter, stored on the panel and recalled with one button. By the end of the afternoon he was cutting between saved positions without looking at the heads at all.

Shading the cameras to match each other

With control centralised, we turned to shading, the careful matching of cameras so they look like one source. Using a test chart and the waveform and vectorscope on the monitoring, we brought black levels, exposure and colour balance of each camera into line with camera one, which we chose as the reference because it was the cleanest of the four.

This is slow, unglamorous work, and it is where most of the improvement came from. The older cameras responded differently to adjustments than the newer ones, so we made small corrections, compared them side by side on the monitors, and repeated the process until a cut between any two cameras no longer drew attention.

We also asked Marcus to sit in on the final comparison, because shading is partly a matter of judgement about what looks natural. He pointed out that one presenter's complexion still looked slightly flat on camera three. A small adjustment fixed it, and he said that was the moment the picture finally looked like his show.

• Reference camera chosen for the cleanest image
• Black levels and exposure matched using scopes
• Skin tones checked by eye with the client present

Settling the lighting that caused half the trouble

Matching cameras only gets you so far if the room light keeps changing under them. We suggested, but did not insist on, replacing the remaining tungsten units with LED fixtures of one colour temperature. Marcus phased this over a few weeks, which suited his budget, and we re-checked the shading once the new lights were in.

Consistent light made the shading far more stable. Settings that previously needed a nudge each session now held from one recording to the next, and we left Marcus a short written reference noting the values and the position of each preset, so anyone covering for him could restore the setup.

We were careful not to oversell what this achieves. A matched, shaded set of cameras will not make a weak programme strong. What it does is remove a distraction, so that the audience stays with the conversation rather than noticing the picture.

What Marcus took from it, and what I did

A few weeks later Marcus got in touch to say that comments about the picture had stopped altogether, and that his own recording days felt calmer because he was no longer worrying about whether the cuts would look right. He now runs the shading check himself at the start of each session, using the notes we left, and rings us only when something genuinely changes.

For my part, the job was a reminder to start by watching rather than prescribing. Marcus arrived convinced he needed new equipment, and the cameras he owned were perfectly capable. The problem lay in how they were set up and controlled, which is a far cheaper thing to fix than a new camera package.

If you are producing with several cameras and find the cuts jarring, look at your automatic settings, your light sources and who is free to adjust things mid-show before you spend anything. Those three questions solve more of these problems than most people expect.