When a security camera suddenly becomes blurry, develops horizontal lines, changes to black-and-white in daylight, or shows a pink picture, the problem is usually caused by focus, lighting, power or cabling. The good news is that many faults can be identified quickly. The important part is knowing which checks are safe to make and when to bring in a qualified CCTV technician.
This Cape Town guide explains the most common causes of poor CCTV images and the practical next steps. If you need an on-site diagnosis, repair or upgrade, Cape Smart Automation provides CCTV installation, repairs and optimisation across Cape Town. Call 083 518 5545 for help.
The way an image looks provides useful clues. A camera that is soft all the time is different from one that only becomes hazy at night. Rolling bars usually point to power or signal issues, while a pink image often suggests a day/night filter or infrared problem. Note when the problem began, whether it affects one camera or several, and whether it changes after rain, a power interruption or sunset.
Start with the outside of the camera. Dust, salt spray, fingerprints, spider webs and condensation can soften an otherwise good image. Use a clean microfibre cloth and a suitable lens-safe cleaner; do not use abrasive material or force the camera housing open. For dome cameras, examine the cover for fine scratches, yellowing or internal moisture. A scratched or cloudy dome can reduce detail, especially at night when infrared light reflects inside the enclosure.
If the lens is clean but the image is still soft, focus may be the issue. Varifocal cameras can move slightly after vibration, heat, a bump or service work. Fixed-lens cameras cannot be manually refocused, so a persistent soft image may come from the mounting position, camera condition or recording settings. Do not try to adjust a sealed IP camera in rain or while standing at height; a technician can focus and test it safely with a live monitor.
Night-time blur is often an infrared problem rather than a focus problem. IR LEDs help a camera see in low light, but the light can reflect off a nearby wall, overhang, security gate, window, spider web or dirty dome. The reflected light blinds the camera and makes the image look milky, washed out or out of focus.
Check whether anything sits close to the camera’s view. Trim plants, remove webs carefully and make sure a camera is not aimed through glass at night. If a camera looks through a window, its own infrared light can bounce straight back from the pane; turn off the camera’s IR only if the software provides that option and there is adequate external lighting. A professional assessment can reposition the camera, add suitable illumination or select a model better suited to the scene.
Lines or flicker can point to a power or signal issue. A weak power adaptor, ageing 12V supply, damaged connector or cable run that is too long can make an analogue camera unstable. In a multi-camera system, several cameras showing the same symptom can indicate a shared power-supply fault. For IP cameras, network cabling, PoE capacity and switch performance also matter.
Do not attempt live electrical repairs or splice CCTV cable without the correct tools and testing equipment. A technician can measure voltage under load, inspect connectors and terminations, test the cable, identify interference and confirm whether the recorder is receiving a clean signal. This protects the cameras and avoids replacing equipment that is still serviceable.
Most CCTV cameras change to black-and-white at night to use infrared light. If that happens in bright daylight, first look for a setting such as night mode, sensitivity or scheduled day/night switching. A shaded installation, heavy storm cloud or a camera mounted under a deep awning may also cause a light sensor to react earlier than expected.
If the setting is correct and the scene is bright, the camera’s IR-cut filter may be stuck. That small mechanism moves into place during the day to preserve colour. A stuck filter can also cause strange tints or a soft image. Resetting the camera may help temporarily, but a recurring fault needs proper diagnosis before it affects important coverage.
A pink or purple image commonly occurs when the camera is confused about whether it is in day or night mode. It can also be linked to white balance, firmware, a failing sensor or the IR-cut filter. Check whether the colour changes after sunset, after a reboot or when a bright light shines directly at the camera. This information helps the technician identify whether the issue is environmental, configuration-related or a camera fault.
On a system with several cameras, compare the affected camera with another camera in a similar position. If only one camera has the problem, the fault is usually local to that camera, its cable or its power. If multiple cameras show unusual colour or flicker, the recorder, shared power or network equipment should be assessed.
Even a correctly installed camera can produce poor footage if the settings are not matched to the scene. Excessive digital zoom, aggressive compression, low bitrate, a low frame rate or a very wide field of view can make faces and vehicle details less useful. Conversely, simply raising brightness can create noise and glare at night.
A professional setup balances camera position, focal length, resolution, recording bitrate, motion settings and lighting. If you are planning an upgrade, ask for the system to be designed around the areas that matter most: vehicle entrances, pedestrian gates, doors, delivery points and perimeter routes. CCTV works best when it is combined with dependable physical security and, where appropriate, access control for controlled entry.
Coastal air, wind-blown dust, winter rain and regular power interruptions can shorten the life of poorly protected cameras and cables. Outdoor cameras need sound seals, correctly terminated cable entries and an enclosure suited to the location. In exposed areas, routine cleaning and inspection help keep lenses clear and prevent moisture or corrosion from becoming an intermittent fault.
Power stability is equally important. A surge or outage can affect a recorder, power supply, PoE switch or individual camera. Ask a technician to inspect backup power, surge protection and the state of any UPS where the system is important for security or business continuity.
Arrange professional help if the camera is mounted at height, there is visible water in a housing, the image has failed after a surge, several cameras are affected, cabling is damaged, or the system records nothing despite the camera appearing live. Cape Smart Automation can inspect the camera, cable, power supply, network and recorder as one system, then recommend a focused repair or upgrade rather than a guess.
The lens may be out of focus, the dome may be scratched or cloudy, the camera may be struggling with low light, or image settings may need adjustment. A technician can identify the cause with a live test.
Yes. Voltage drop, a tired power supply, poor connectors and interference can cause flicker, rolling lines or intermittent loss of image. It should be tested rather than guessed.
Check the day/night settings and the lighting around the camera. If the problem persists in bright conditions, the light sensor or IR-cut filter may need attention.
A pink image often relates to a stuck or faulty IR-cut filter, a day/night switching issue, white-balance settings or a hardware fault. Note when it happens and arrange a diagnostic visit if it does not clear.
Yes. Cape Smart Automation can assess cameras, recorders, power supplies, network equipment and cable runs, whether or not the original installer fitted the system. Call 083 518 5545 to book assistance in Cape Town.
Do not rely on unclear footage when your home or business security depends on it. For CCTV fault-finding, camera focus correction, image-quality optimisation, replacement cameras or a complete CCTV installation, contact Cape Smart Automation on 083 518 5545 or request a service visit.
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