Re: On ProPhotoRGB
Re: On ProPhotoRGB
- Subject: Re: On ProPhotoRGB
- From: Marco Ugolini <email@hidden>
- Date: Tue, 28 Feb 2006 22:26:03 -0800
In a message dated 2/27/06 8:34 AM, bruce fraser wrote:
> The weirdnesses Marco has posted are as much
> about the limitations of Lab and Luv as they are
> about any actual issues with ProPhoto. In my
> experience (I've been using ProPhoto since it was
> ROMM RGB, so about 7 years now), they don't
> represent a problem in the normal practice of
> reproducing images.
Hi Bruce.
Good to see you back in this forum. I hope all is well with you.
My graphs (the ones I posted) look not only weird, but slightly alarming as
well, at least to me, with my relatively limited knowledge of the nuts and
bolts of tried-and-true color science. I certainly am no Mark Fairchild...
Since I see great value in practical experience (and not having had any of
my own yet with it), I trust your experience and judgment when you say that
you have found ProPhotoRGB not to cause damage to images in the course of
the 7 years that you have used it through its changing incarnations.
(All the same, I still have those nagging questions in the back of my mind:
how about the specific things I pointed out regarding ProPhotoRGB? How does
one explain them, if at all possible without getting hopelessly technical?)
On another note, I do remember you years ago warning us listeners at your
workshops regarding the risks of posterization present when using
WideGamutRGB (another large-gamut space, one that seems to have gone out of
style over time). I assume that the same warning would apply to working with
ProPhotoRGB, another large-gamut RGB space.
What I am driving at is that what you probably meant then was that there are
definite posterization risks in using a large-gamut RGB space in 8 bits,
which we can avoid today by working with ProPhotoRGB in 16 bits using
Photoshop's newfound ability to use that bit depth with all the trimmings
(layers, etc.). Would you see that as a valid statement?
All the best.
--------------
Marco Ugolini
Mill Valley, CA
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