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The word photography means "drawing with light". Controlling or selecting the light a camera records is essential to all aspects of photographic composition.

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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 ...