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Article #349

Re: Difference between brightness and exposure?

#349
From: Bruce_Fraser
Date: Wed, 25 Aug 2004 19:21
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Rags,

I respectfully disagree completely. Gamma correction isn't something imposed by the behavior of monitors, it's something imposed by the difference between the way digital sensors and human eyeballs respond to light. Digital sensors simply count photons linearly. Eyeballs apply a compressive nonlinearity roughly equivalent to a power curve of around 2.4οΏ½the fact that 18% reflectance corresponds to a visual 50% gray should give you a clue. But you're totally incorrect in saying that level 2048 in a raw linear capture corresponds to midtone gray. It corresponds to 50% reflectance, not 18%.

Mike,

If you wish to swallow Timo's snake-oil, good luck to you, but don't come crying to me for help when your shadows fall apart and your blue skies turn to rainbow ones....

This topic has already been hashed and rehashed to death. I make a practice of avoiding arguments with True Believers.
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Subject: Re: Difference between brightness and exposure?
Message-ID: <3bb4e545.32@webx.la2eafNXanI>
Date: Wed, 25 Aug 2004 12:21:36 -0700
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