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Gamma correction and halftone
The RGB values are most likely gamma compressed.
Consider gamma calibration images like the one below. … However, the gamma compression applied was more likely the sRGB gamma compression than an overall gamma of $2.2$.
$$
\frac{w_\text{white}}{w_\text{white}+w_\text{black}} =
\begin{cases}
12.92V &\text …