Re: On ProPhotoRGB
Re: On ProPhotoRGB
- Subject: Re: On ProPhotoRGB
- From: Marco Ugolini <email@hidden>
- Date: Sun, 26 Feb 2006 12:28:03 -0800
In a message dated 2/26/06 5:19 AM, Andrew Rodney wrote:
> In the Adobe forum, Bruce Fraser posted about the clearest explanation you
> could ask for about the reasons why such large spaces are needed:
>
> http://www.adobeforums.com/cgi-bin/webx?email@hidden@.3bbabc37
Hi Andrew.
Thank you for the link. I will read Bruce's contributions to the Adobe
forum.
As for needing large-gamut spaces, I understand the logic, and see no
objections in principle. My questions are about details, not the more
general picture: I am just perplexed by the things I listed (primaries
straying into the la-la-land outside the spectrum locus, for reasons that
may be good but with consequences that may not be so good; seemingly poor
linearity; "pinched" steps; crossovers and twisted hue shifts. I listed them
more in detail in yesterday's message).
Again, I think I do understand your point about large-gamut spaces being
necessary in professional imaging, together with 16-bit editing if storage
and processing power are no issue. But I think it is also necessary to
explain why a space like ProPhotoRGB, with all these apparent downsides, is
still recommended over, say, DonRGB, which appears to have none as seemingly
egregious, as can be seen from the images I posted at
<http://home.mindspring.com/~marcoug>.
If the preference for ProPhotoRGB over DonRGB is simply due to the former
being larger, is that enough in itself, whatever the possible repercussions,
if any, due to the things I listed?
The analogy of the circle and the triangle is indeed an apt analogy, but
still it does not address the desirability of the practical consequences (by
that I mean all of them, positive *and negative*) of working with one hand
in la-la-land and the other within the safe margins of the spectrum locus.
Thank you, and best regards.
--------------
Marco Ugolini
Mill Valley, CA
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