Hello,

I've been reading about raw capture on cambridge in colour as well as in this adobe white paper. I get stuck on understanding the linear gamma gradient at the bottom of page 2 in the white paper. I understand why the gamma corrected looks that way but I don't understand why the linear distribution/raw capture starts out that way.

Here is my thought process....

I'm imagining the CCD as an array of light 'buckets'. So, if you turn the image of the Linear Distribution gradient on it's side with the white on the top, it's one light bucket (each light bucket would be like a graduated cylinder used for liquids). Some buckets are completely filled with photons (we call this level 4,096). Some are half-filled (we call this level 2,048). And so, on... Why then is a half-filled bucket so pale?

What is this Linear Distribution gradient derived from? Where would middle gray appear in the Linear Distribution gradient as a percentile (12-18%?)?

I have a feeling that this has something to do about reflected light and logarithms but I am confused. I thought that the logarithms stemmed from perceptual issues and not actual light quantities (linear raw capture). I would have thought that the linear capture would have looked like the Gamma Corrected Distribution; then we would need to correct that raw data/standard incremental progression to better reflect what we perceive/see.

Can anyone help me understand this topic?

Thanks!