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   <h1>CSS Color Correction Module</h1>

   <h2 class="no-num no-toc" id=longstatus-date>Editor's Draft 24 February
    2011</h2>

   <dl>
    <dt>This version:</dt>
    <!-- <dd><a href="http://www.w3.org/TR/2011/ED-css-color-correction-20110224">http://www.w3.org/TR/2011/ED-css-color-correction-20110224</a></dd> -->

    <dd><a
     href="http://dev.w3.org/csswg/css-color-correction/">http://dev.w3.org/csswg/css-color-correction/</a>

    <dt>Latest version:

    <dd><a
     href="http://www.w3.org/TR/css-color-correction/">http://www.w3.org/TR/css-color-correction/</a>

    <dt>Previous version:

    <dd><a
     href="http://lists.w3.org/Archives/Public/www-style/2009Nov/0226.html">http://lists.w3.org/Archives/Public/www-style/2009Nov/0226.html</a></dd>
    <!--
    <dd><a href="http://www.w3.org/TR/2008/WD-css-color-correction-20080721">http://www.w3.org/TR/2008/WD-css-color-correction-20080721</a></dd>
    -->

    <dt>Editors:

    <dd class=vcard><span class="fn n"><abbr class=given-name>L.</abbr> <span
     class=additional-name>David</span> <span
     class=family-name>Baron</span></span> (<span class="org company
     vcard"><a class="fn org url" href="http://www.mozilla.com/">Mozilla
     Corporation</a></span>) &lt;<a class=email
     href="mailto:dbaron@dbaron.org">dbaron@dbaron.org</a>&gt;
   </dl>
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    rel=license>Copyright</a> &copy; 2011 <a
    href="http://www.w3.org/"><acronym title="World Wide Web
    Consortium">W3C</acronym></a><sup>&reg;</sup> (<a
    href="http://www.csail.mit.edu/"><acronym title="Massachusetts Institute
    of Technology">MIT</acronym></a>, <a href="http://www.ercim.eu/"><acronym
    title="European Research Consortium for Informatics and
    Mathematics">ERCIM</acronym></a>, <a
    href="http://www.keio.ac.jp/">Keio</a>), All Rights Reserved. W3C <a
    href="http://www.w3.org/Consortium/Legal/ipr-notice#Legal_Disclaimer">liability</a>,
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    use</a> rules apply.</p>
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  </div>

  <h2 class="no-num no-toc" id=abstract>Abstract</h2>

  <p>CSS (Cascading Style Sheets) is a language for describing the rendering
   of HTML and XML documents. While existing specifications define the color
   space of colors specified in style sheets and in other resources, the
   rules on color space have generally not been followed, leading to
   avoidable differences in color between devices or implementations. This
   document defines a new CSS property that will help migration towards the
   correct handling of colors that is already defined by allowing authors to
   specify a preference for the correct or the traditional (device-dependent)
   color handling.

  <h2 class="no-num no-toc" id=status>Status of This Document</h2>
  <!--begin-status-->

  <p>This is a public copy of the editors' draft. It is provided for
   discussion only and may change at any moment. Its publication here does
   not imply endorsement of its contents by W3C. Don't cite this document
   other than as work in progress.

  <p>The (<a
   href="http://lists.w3.org/Archives/Public/www-style/">archived</a>) public
   mailing list <a
   href="mailto:www-style@w3.org?Subject=%5Bcss-color-correction%5D%20PUT%20SUBJECT%20HERE">
   www-style@w3.org</a> (see <a
   href="http://www.w3.org/Mail/Request">instructions</a>) is preferred for
   discussion of this specification. When sending e-mail, please put the text
   &#8220;css-color-correction&#8221; in the subject, preferably like this:
   &#8220;[<!---->css-color-correction<!---->] <em>&hellip;summary of
   comment&hellip;</em>&#8221;

  <p>This document was produced by the <a href="/Style/CSS/members">CSS
   Working Group</a> (part of the <a href="/Style/">Style Activity</a>).

  <p>This document was produced by a group operating under the <a
   href="/Consortium/Patent-Policy-20040205/">5 February 2004 W3C Patent
   Policy</a>. W3C maintains a <a href="/2004/01/pp-impl/32061/status"
   rel=disclosure>public list of any patent disclosures</a> made in
   connection with the deliverables of the group; that page also includes
   instructions for disclosing a patent. An individual who has actual
   knowledge of a patent which the individual believes contains <a
   href="/Consortium/Patent-Policy-20040205/#def-essential">Essential
   Claim(s)</a> must disclose the information in accordance with <a
   href="/Consortium/Patent-Policy-20040205/#sec-Disclosure">section 6 of the
   W3C Patent Policy</a>.</p>
  <!--end-status-->

  <h2 class="no-num no-toc" id=contents>Table of Contents</h2>
  <!--begin-toc-->

  <ul class=toc>
   <li><a href="#introduction"><span class=secno>1. </span>Introduction</a>

   <li><a href="#conformance"><span class=secno>2. </span>Conformance</a>

   <li><a href="#definitions"><span class=secno>3. </span>Definitions</a>

   <li><a href="#color"><span class=secno>4. </span>Opting in or out of color
    management</a>

   <li><a href="#acknowledgments"><span class=secno>5.
    </span>Acknowledgments</a>

   <li><a href="#references"><span class=secno>6. </span>References</a>
    <ul class=toc>
     <li><a href="#normative"><span class=secno>6.1. </span>Normative</a>

     <li><a href="#informative"><span class=secno>6.2. </span>Informative</a>
      
    </ul>

   <li class=no-num><a href="#index">Index</a>

   <li class=no-num><a href="#property">Property index</a>
  </ul>
  <!--end-toc-->

  <hr>

  <h2 id=introduction><span class=secno>1. </span>Introduction</h2>

  <p><em>This section is non-normative.</em>

  <p>CSS Level 1 (<a href="#CSS1" rel=biblioentry>[CSS1]<!--{{CSS1}}--></a>),
   CSS Level 2 (<a href="#CSS21"
   rel=biblioentry>[CSS21]<!--{{!CSS21}}--></a>), and the CSS Color Module,
   Level 3 (<a href="#CSS3COLOR"
   rel=biblioentry>[CSS3COLOR]<!--{{CSS3COLOR}}--></a>) define colors
   specified in CSS to be in the sRGB color space (<a href="#SRGB"
   rel=biblioentry>[SRGB]<!--{{!SRGB}}--></a>). However, most or all existing
   Web browser implementations do not correct colors specified in HTML, CSS,
   or untagged images even when the proper correction is known.

  <p>If browsers did so, it would make the colors displayed in Web pages more
   consistent between different displays and operating systems. However, a
   more important type of consistency is the consistency of colors in
   different parts of a page on the same display, such as between colors
   specified in style sheets and colors in images, or between those colors
   and colors drawn by plugins. Improving the consistency of colors between
   different displays, therefore, requires care not to cause the worse
   problem of inconsistency of colors on the same display.

  <p class=issue> plan ... future improvements in plugin API ...

  <h2 id=conformance><span class=secno>2. </span>Conformance</h2>

  <p>The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 (see <a
   href="#RFC2119" rel=biblioentry>[RFC2119]<!--{{!RFC2119}}--></a>). This
   specification uses these words to describe either conformance requirements
   for style sheets or those for implementations.

  <p>Definitions of CSS properties given in this specification MUST be used
   by style sheets in a manner conformant to CSS 2.1 and its template for
   property definitions and MUST be interpreted by implementations in a
   manner conformant to the same (see <a href="#CSS21"
   rel=biblioentry>[CSS21]<!--{{!CSS21}}--></a>, particularly section 1.4.2
   and chapters 4, 6, and 3).

  <p class=index-def id=conformance-implementation
   title="conformance::implementation">An implementation of this
   specification (such as a Web browser or other CSS-based renderer) conforms
   to it if it meets all conformance requirements described as requirements
   on implementations.

  <p class=index-def id=conformance-style-sheet title="conformance::style
   sheet">A style sheet conforms to this specification if it meets all the
   requirements on style sheets.

  <p class=index-def id=conformance-authoring-tool
   title="conformance::authoring tool">An authoring tool that generates style
   sheets (such as an editor or style sheet generator) conforms to this
   specification if it generates only conforming style sheets.

  <h2 id=definitions><span class=secno>3. </span>Definitions</h2>

  <dl>
   <dt><dfn id=untagged-image>untagged image</dfn>

   <dd class=issue>... include images and canvases ... exclude SVG

   <dt><dfn id=untagged-video>untagged video</dfn>

   <dd class=issue>...
  </dl>

  <h2 id=color><span class=secno>4. </span>Opting in or out of color
   management</h2>

  <table class=propdef>
   <tbody>
    <tr>
     <td>Name:

     <td><dfn id=color-correction>color-correction</dfn>

    <tr>
     <td>Value:

     <td>default | sRGB

    <tr>
     <td>Initial:

     <td>default

    <tr>
     <td>Applies to:

     <td>all elements

    <tr>
     <td>Inherited:

     <td>yes

    <tr>
     <td>Percentages:

     <td>N/A

    <tr>
     <td>Media:

     <td>visual

    <tr>
     <td>Computed&nbsp;value:

     <td>as specified
  </table>

  <p>The color-correction property specifies the color space that colors
   specified in CSS and colors in images whose color space is undefined
   according to the rules for the relevant image format (<dfn
   id=untagged-images title="untagged image">untagged images</dfn>) are in.
   It does not apply to videos, since untagged video should be presumed to be
   in CCIR 601. <span class=issue>Really? Shouldn't video be consistent with
   images? Or do implementations really do this differently?</span>

  <dl>
   <dt><dfn class=prop-value id=color-correction-value-sRGB>sRGB</dfn>

   <dd>Colors specified in CSS and colors in untagged images are in the sRGB
    color space, and implementations MUST display them accordingly.

   <dt><dfn class=prop-value id=color-correction-value-default>default</dfn>

   <dd>The color space for colors specified in CSS and colors in untagged
    images is not defined. However, implementations MUST use a single color
    space for such colors so that they match each other. When doing so would
    not cause color mismatches with content such as plugins, implementations
    SHOULD treat &lsquo;<code class=property>auto</code>&rsquo; the same as
    'sRGB'.
  </dl>

  <p class=note>The initial value of this property may change in a future
   level of this specification.

  <h2 id=acknowledgments><span class=secno>5. </span>Acknowledgments</h2>

  <p> Bert Bos, Tantek &Ccedil;elik, Beth Dakin, Simon Fraser, Chris Lilley,
   David Singer, and Henri Sivonen have given input useful to the making of
   this specification.

  <h2 id=references><span class=secno>6. </span>References</h2>

  <h3 id=normative><span class=secno>6.1. </span>Normative</h3>
  <!--begin-normative-->
  <!-- Sorted by label -->

  <dl class=bibliography>
   <dt style="display: none"><!-- keeps the doc valid if the DL is empty -->
    <!---->

   <dt id=CSS21>[CSS21]

   <dd>Bert Bos; et al. <a
    href="http://www.w3.org/TR/2010/WD-CSS2-20101207"><cite>Cascading Style
    Sheets Level 2 Revision 1 (CSS 2.1) Specification.</cite></a> 7 December
    2010. W3C Working Draft. (Work in progress.) URL: <a
    href="http://www.w3.org/TR/2010/WD-CSS2-20101207">http://www.w3.org/TR/2010/WD-CSS2-20101207</a>
    </dd>
   <!---->

   <dt id=RFC2119>[RFC2119]

   <dd>S. Bradner. <a href="http://www.ietf.org/rfc/rfc2119.txt"><cite>Key
    words for use in RFCs to Indicate Requirement Levels.</cite></a> Internet
    RFC 2119. URL: <a
    href="http://www.ietf.org/rfc/rfc2119.txt">http://www.ietf.org/rfc/rfc2119.txt</a>
    </dd>
   <!---->

   <dt id=SRGB>[SRGB]

   <dd><a href="http://www.iec.ch/nr1899.htm"><cite>Multimedia systems and
    equipment - Colour measurement and management - Part 2-1: Colour
    management - Default RGB colour space - sRGB.</cite></a> IEC 61966-2-1
    (1999-10) ISBN: 2-8318-4989-6 - ICS codes: 33.160.60, 37.080 - TC 100 -
    51 pp. as amended by Amendment A1:2003. URL: <a
    href="http://www.iec.ch/nr1899.htm">http://www.iec.ch/nr1899.htm</a></dd>
   <!---->
  </dl>
  <!--end-normative-->

  <h3 id=informative><span class=secno>6.2. </span>Informative</h3>
  <!--begin-informative-->
  <!-- Sorted by label -->

  <dl class=bibliography>
   <dt style="display: none"><!-- keeps the doc valid if the DL is empty -->
    <!---->

   <dt id=CSS1>[CSS1]

   <dd>H&#229;kon Wium Lie; Bert Bos. <a
    href="http://www.w3.org/TR/2008/REC-CSS1-20080411"><cite>Cascading Style
    Sheets (CSS1) Level 1 Specification.</cite></a> 11 April 2008. W3C
    Recommendation. URL: <a
    href="http://www.w3.org/TR/2008/REC-CSS1-20080411">http://www.w3.org/TR/2008/REC-CSS1-20080411</a>
    </dd>
   <!---->

   <dt id=CSS3COLOR>[CSS3COLOR]

   <dd>Tantek &#199;elik; Chris Lilley; L. David Baron. <a
    href="http://www.w3.org/TR/2010/PR-css3-color-20101028"><cite>CSS Color
    Module Level 3.</cite></a> 28 October 2010. W3C Proposed Recommendation.
    (Work in progress.) URL: <a
    href="http://www.w3.org/TR/2010/PR-css3-color-20101028">http://www.w3.org/TR/2010/PR-css3-color-20101028</a>
    </dd>
   <!---->
  </dl>
  <!--end-informative-->

  <h2 class=no-num id=index>Index</h2>
  <!--begin-index-->

  <ul class=indexlist>
   <li>color-correction, <a href="#color-correction"
    title=color-correction><strong>4.</strong></a>

   <li>conformance
    <ul>
     <li>authoring tool, <a href="#conformance-authoring-tool"
      title="conformance, authoring tool"><strong>2.</strong></a>

     <li>implementation, <a href="#conformance-implementation"
      title="conformance, implementation"><strong>2.</strong></a>

     <li>style sheet, <a href="#conformance-style-sheet" title="conformance,
      style sheet"><strong>2.</strong></a>
    </ul>

   <li>default, <a href="#color-correction-value-default"
    title=default><strong>4.</strong></a>

   <li>sRGB, <a href="#color-correction-value-sRGB"
    title=sRGB><strong>4.</strong></a>

   <li>untagged image, <a href="#untagged-image" title="untagged
    image"><strong>3.</strong></a>, <a href="#untagged-images"
    title="untagged image"><strong>4.</strong></a>

   <li>untagged video, <a href="#untagged-video" title="untagged
    video"><strong>3.</strong></a>
  </ul>
  <!--end-index-->

  <h2 class=no-num id=property>Property index</h2>
  <!--begin-properties-->

  <table class=proptable>
   <thead>
    <tr>
     <th>Property

     <th>Values

     <th>Initial

     <th>Applies&nbsp;to

     <th>Inh.

     <th>Percentages

     <th>Media

   <tbody>
    <tr valign=baseline>
     <td><a class=property href="#color-correction">color-correction</a>

     <td>default | sRGB

     <td>default

     <td>all elements

     <td>yes

     <td>N/A

     <td>visual
  </table>
  <!--end-properties-->
</html>
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 <meta http-equiv="Content-Language" content="en">
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<div class="head">
<!--logo-->

<h1>CSS Color Correction Module</h1>

<h2 class="no-num no-toc">[LONGSTATUS] [DATE]</h2>
<dl>
  <dt>This version:</dt>
    <!-- <dd><a href="[VERSION]">[VERSION]</a></dd> -->
  <dd><a href="http://dev.w3.org/csswg/css-color-correction/">http://dev.w3.org/csswg/css-color-correction/</a></dd>
  <dt>Latest version:</dt>
    <dd><a href="http://www.w3.org/TR/[SHORTNAME]/">http://www.w3.org/TR/[SHORTNAME]/</a></dd>
  <dt>Previous version:</dt>
    <dd><a href="http://lists.w3.org/Archives/Public/www-style/2009Nov/0226.html">http://lists.w3.org/Archives/Public/www-style/2009Nov/0226.html</a></dd>
    <!--
    <dd><a href="http://www.w3.org/TR/2008/WD-css-color-correction-20080721">http://www.w3.org/TR/2008/WD-css-color-correction-20080721</a></dd>
    -->
  <dt>Editors:</dt>
    <dd class="vcard"><span class="fn n"><abbr class="given-name">L.</abbr>
<span class="additional-name">David</span> <span
class="family-name">Baron</span></span> (<span class="org company vcard"><a
class="fn org url"
     href="http://www.mozilla.com/">Mozilla Corporation</a></span>) &lt;<a
class="email"
     href="mailto:dbaron@dbaron.org">dbaron@dbaron.org</a>&gt;
    </dd>
</dl>

<!--copyright-->

<hr title="Separator for header">

</div>

<h2 class="no-num no-toc" id="abstract">Abstract</h2>

<p>CSS (Cascading Style Sheets) is a language for describing the
rendering of HTML and XML documents.  While existing specifications
define the color space of colors specified in style sheets and in other
resources, the rules on color space have generally not been followed,
leading to avoidable differences in color between devices or
implementations.  This document defines a new CSS property that will
help migration towards the correct handling of colors that is already
defined by allowing authors to specify a preference for the correct or
the traditional (device-dependent) color handling.</p>

<h2 class="no-num no-toc" id="status">Status of This Document</h2>

<!--status-->

<h2 class="no-num no-toc" id="contents">Table of Contents</h2>
<!--toc-->

<hr>

<h2 id="introduction">Introduction</h2>

<p><em>This section is non-normative.</em></p>

<p>CSS Level 1 ([[CSS1]]), CSS Level 2 ([[!CSS21]]), and the CSS Color
Module, Level 3 ([[CSS3COLOR]]) define colors specified in CSS to be in
the sRGB color space ([[!SRGB]]).  However, most or all existing Web
browser implementations do not correct colors specified in HTML, CSS,
or untagged images even when the proper correction is known.</p>

<p>If browsers did so, it would make the colors displayed in Web pages
more consistent between different displays and operating systems.
However, a more important type of consistency is the consistency of
colors in different parts of a page on the same display, such as between
colors specified in style sheets and colors in images, or between those
colors and colors drawn by plugins.  Improving the consistency of colors
between different displays, therefore, requires care not to cause the
worse problem of inconsistency of colors on the same display.</p>

<p class="issue"> plan ... future improvements in plugin API ...</p>

<h2 id="conformance">Conformance</h2>

<p>The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 (see
[[!RFC2119]]).  This specification uses these words to describe either
conformance requirements for style sheets or those for implementations.</p>

<p>Definitions of CSS properties given in this specification MUST be
used by style sheets in a manner conformant to CSS 2.1 and its template
for property definitions and MUST be interpreted by implementations in a
manner conformant to the same (see [[!CSS21]], particularly section
1.4.2 and chapters 4, 6, and 3).</p>

<p class="index-def" title="conformance::implementation"
id="conformance-implementation">An implementation of this specification
(such as a Web browser or other CSS-based renderer) conforms to it if it
meets all conformance requirements described as requirements on
implementations.</p>

<p class="index-def" title="conformance::style sheet"
id="conformance-style-sheet">A style sheet conforms to this
specification if it meets all the requirements on style sheets.</p>

<p class="index-def" title="conformance::authoring tool"
id="conformance-authoring-tool">An authoring tool that generates style
sheets (such as an editor or style sheet generator) conforms to this
specification if it generates only conforming style sheets.</p>

<h2 id="definitions">Definitions</h2>

<dl>

<dt><dfn>untagged image</dfn></dt>
<dd class="issue">... include images and canvases ... exclude SVG</dd>

<dt><dfn>untagged video</dfn></dt>
<dd class="issue">...</dd>

</dl>

<h2 id="color">Opting in or out of color management</h2>

<table class=propdef>
    <tr>
      <td>Name:
      <td><dfn>color-correction</dfn>
    <tr>
      <td>Value:
      <td>default | sRGB
    <tr>
      <td>Initial:
      <td>default
    <tr>
      <td>Applies to:
      <td>all elements
    <tr>
      <td>Inherited:
      <td>yes
    <tr>
      <td>Percentages:
      <td>N/A
    <tr>
      <td>Media:
      <td>visual
    <tr>
      <td>Computed&nbsp;value:
      <td>as specified
</table>

<p>The color-correction property specifies the color space that colors
specified in CSS and colors in images whose color space is undefined according
to the rules for the relevant image format (<dfn title="untagged
image">untagged images</dfn>) are in.  It does not apply to videos, since
untagged video should be presumed to be in CCIR 601.  <span
class="issue">Really?  Shouldn't video be consistent with images?  Or do
implementations really do this differently?</span></p>

<dl>

<dt><dfn class="prop-value" id="color-correction-value-sRGB">sRGB</dfn></dt>
  <dd>Colors specified in CSS and colors in untagged images are in the
  sRGB color space, and implementations MUST display them accordingly.</dd>

<dt><dfn class="prop-value" id="color-correction-value-default">default</dfn></dt>
  <dd>The color space for colors specified in CSS and colors in untagged
  images is not defined.  However, implementations MUST use a single
  color space for such colors so that they match each other.  When
  doing so would not cause color mismatches with content such as
  plugins, implementations SHOULD treat 'auto' the same as 'sRGB'.</dd>

</dl>

<p class="note">The initial value of this property may change in a future
level of this specification.</p>

<h2 id="acknowledgments">Acknowledgments</h2>

<p>
Bert Bos,
Tantek &Ccedil;elik,
Beth Dakin,
Simon Fraser,
Chris Lilley,
David Singer,
and Henri Sivonen
have given input useful to the making of this specification.
</p>

<h2 id="references">References</h2>

<h3 id="normative">Normative</h3>

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<h3 id="informative">Informative</h3>

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<h2 id="index" class="no-num">Index</h2>

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<h2 id="property" class="no-num">Property index</h2>

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Received on Thursday, 24 February 2011 02:34:11 UTC