Re: L* hype -- was: Re: profiling monitor range
Re: L* hype -- was: Re: profiling monitor range
- Subject: Re: L* hype -- was: Re: profiling monitor range
- From: Marco Ugolini <email@hidden>
- Date: Wed, 21 Jun 2006 09:27:51 -0700
In a message dated 6/21/06 7:19 AM, Peter Karp wrote:
> Input and output both have 8 bit depth. Then calculate a transform of
> L* to a gamma value of 2.2 (or vice versa that doesn't matter). You'll
> see that you have 234 levels left from the original 256. 22 levels are
> _gone_ That's the result of the quantization errors due the limited
> precision in a computer. I don't even have to look at a monitor, but
> can predict that you will have less smooth gradients! But you can test
> this for yourself (see below).
>
> [snip]
>
> The L* calibration thing is in my eyes mostly marketing hype.
Hi Peter.
This is all fine and dandy, from a strictly mathematical standpoint. But
then we have to use our eyes and see for ourselves.
Fact is that I see with my own eyes that creating an L*-based LUT profile
does eliminate many of the banding instances on my LCD display that,
instead, I can clearly notice by using, say, gamma 2.2 or even native gamma,
though not all of them. And that is a simple fact, no matter whether the
mathematics tell me that it should be otherwise or not.
Perfection never being of this world, as some say, that is good reason
enough for me to stick with L*, as I've done now for a few years, and
happily so.
> The L* calibration thing is in my eyes mostly marketing hype.
Paraphrasing the line by the late and great Richard Pryor (uttered by the
husband to his wife after being caught in bed with another woman in
flagrante delicto), each of us should determine for him/herself whether we'd
rather believe the mathematics or our own "lying eyes"... :-)
Regards.
--------------
Marco Ugolini
Mill Valley, CA
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