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Why is the white background not white?
This is a common problem. The metering and light balance are the reasons that you are having problems achieving good results with your photos.
All cameras on the auto cycle are calibrated for 18% gray. Another words a photo of all white results in 18% gray. A photo of black results in 18% gray. The camera adjusts the shutter speed and aperture to achieve an average light level of 18%. That is why photos of snow always appear gray. To compensate for this characteristic of the cameras an 18 % gray panel is held in front of the camera and than the settings are set.manually. The metering in the camera is now locked and using the same light levels objects will be in their natural level.
A second problem is the white balance. Using flash avoids some of these problems. Adjusting the camera for source lighting type will help the most. The light balance is the cause of discoloration of the objects in the photo. Usually the camera white balance can be set for auto, incandescent, fluorescent, outdoor or flash,
Use a manual setting if it is available on you camera, You need to adjust the settings until you get acceptable results. If the photo is dark add light by reducing the aperture number to a lower number allowing more light. After the aperture is open wide(lowest number) increase the exposure to longer time. With very low light levels a tripod may be necessary.. After doing this once record the numbers for next time.
on Nov 16, 2015
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