18% Gray code value in 16 bit Linear RAW?

Started 3 months ago | Questions thread
spider-mario Contributing Member • Posts: 946
Re: 18% Gray code value in 16 bit Linear RAW?

If you have measured that the raw file clips at 2000% diffuse reflectance then 18% reflectance would presumably be 18/2000 of the way between the black point and the clipping point, so at “black point + (18/2000) × (maximum value − black point)”. Assuming that the full 16-bit range is used, the maximum value would be 65 535, and so the code value for 18% would be “black point + (18/2000) × (65 535 − black point)”.

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