Traditional Culture Encyclopedia - Photography and portraiture - What color is the 25-degree gray photo?
What color is the 25-degree gray photo?
photography photometry takes 18% reflectivity as the exposure reference value. (Because the photometry system commonly used by cameras takes the gray of the 18-degree gray board as the reference value, when the measured value of the pure black subject or pure white subject is compared with the 18-degree gray board, there will be great errors, resulting in overexposure or underexposure of the actual photometry value! )
the gray scale of a black-and-white image * * * is 256, which is -255 in numerical terms. By how many degrees of gray scale, we actually express the gray scale of 256 as a percentage. People's skin color is close to 18 degrees of gray, which actually means that black components account for 18% in pure white, so we can also know that white accounts for 82%, from which we can calculate that in RGB.
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