POV-Ray : Newsgroups : povray.binaries.programming : An updated povr tarball for Unix/Linux. b0bcf6c0 : Re: An updated povr tarball for Unix/Linux. b0bcf6c0 Server Time
19 Jun 2024 16:11:37 EDT (-0400)
  Re: An updated povr tarball for Unix/Linux. b0bcf6c0  
From: clipka
Date: 29 May 2021 21:08:19
Message: <60b2e583$1@news.povray.org>
Am 26.04.2021 um 13:25 schrieb William F Pokorny:

> The srgb keywords now permit inputs ONLY in the 0 to 1 range for which 
> the srgb color space is defined. Previously values outside the range 
> generated linear values but ones not making any particular sense.

Technically, contrary to Ive's claim (who is usually right in such 
things), the sRGB color space _is_ well-defined(*) for values outside 
the 0..1 range, both positive and negative.

The official sRGB specification (v1.10) refers to limiting the color 
values to the 0..1 regime as "typical", and _in such cases_ mandates 
that simple clipping is to be used for this purpose, but there is no 
provision mandating gamut limiting _per se_, and there is no fundamental 
mathematical problem with the functions outside the range.

(* Note that I'm not saying well-suited. That would be an entirely 
different discussion.)

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