Incense

by Bart Arondson

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a gray cards is used to determine the correct exposure or white balance before or during shooting

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How do I measure the correlated color temperature of a light source with a DSLR without a gray card?

By curiosity, I tried to measure the correlated color temperature of different light sources in my house by taking a photo of a white object (a piece of paper) lit by a single source at a time. The ...