[css2] Removed gamma section. Issue 221 http://wiki.csswg.org/spec/css2.1#issue-221

bert-github · bert-github · commit 5f3b2c90c674 · 2011-03-04T01:20:17.000Z
--HG--
extra : convert_revision : svn%3A73dc7c4b-06e6-40f3-b4f7-9ed1dbc14bfc/trunk%403118
diff --git a/css2/colors.src b/css2/colors.src
@@ -1,6 +1,6 @@
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
 <html lang="en">
-<!-- $Id: colors.src,v 2.55 2010-12-16 19:16:40 bbos Exp $ -->
+<!-- $Id: colors.src,v 2.56 2011-03-04 01:20:17 bbos Exp $ -->
 <head>
 <title>Colors and backgrounds</title>
 <meta name="editor" lang="tr" content="Tantek &Ccedil;elik">
@@ -396,57 +396,6 @@ P { background: url("chess.png") gray 50% repeat fixed }
 </pre>
 </div>
 
-<h2><a name="gamma-correction">Gamma correction</a></h2>
-
-<p><em>For information about gamma issues, please consult the 
-Gamma Tutorial in the PNG specification ([[PNG]]).</em></p>
-
-
-<div class="note"><p>
-<em><strong>Note.</strong>
-In the computation of gamma correction, UAs displaying on a CRT
-may assume an ideal CRT and ignore any effects on apparent gamma
-caused by dithering. That means the minimal handling they need to do
-on current platforms is:
-</em>
-</p>
-  <dl>
-    <dt> PC using MS-Windows</dt>
-    <dd> none</dd>
-    <dt> Unix using X11</dt>
-    <dd> none</dd>
-    <dt> Mac using QuickDraw</dt>
-    <dd> apply gamma 1.45 [[ICC42]] (ColorSync-savvy applications
-      may simply pass the sRGB ICC profile to ColorSync
-      to perform correct color correction)</dd>
-    <dt> SGI using X</dt>
-    <dd> apply the gamma value from
-    <tt>/etc/config/system.glGammaVal</tt> (the default value being
-    1.70; applications running on Irix 6.2 or above may simply pass
-    the sRGB ICC profile to the color management system)</dd>
-    <dt> NeXT using NeXTStep</dt>
-    <dd> apply gamma 2.22</dd>
-  </dl>
-
-<p>"Applying gamma" means that each of the three R, G and B must be
-converted to R'=R<sup>gamma</sup>, G'=G<sup>gamma</sup>,
-B'=B<sup>gamma</sup>, before being handed to the OS.
-</p>
-<p>This may be done rapidly by building a 256-element lookup table
-once per browser invocation thus:
-</p>
-<pre>
-for i := 0 to 255 do
-  raw := i / 255.0;
-  corr := pow (raw, gamma);
-  table[i] := trunc (0.5 + corr * 255.0)
-end
-</pre>
-
-<p>which then avoids any need to do transcendental math per color
-attribute, far less per pixel.
-</p>
-</div>
 </body>
 </html>
 <!-- Keep this comment at the end of the file
