Reference:Color Expressions - Revision history

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technical correction

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2016-12-16T15:12:26Z

Indexentries fix

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2016-07-10T15:39:50Z

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2016-07-10T11:50:16Z

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2016-07-10T02:27:28Z

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2016-07-10T00:49:38Z

correction

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2016-07-10T00:11:48Z

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Clipka: indexentry fix

2016-05-03T23:05:04Z

indexentry fix

Jholsenback: 1 revision: link repair

2012-07-23T19:27:44Z

1 revision: link repair

Jholsenback: link repair

2012-07-21T11:40:26Z

link repair

@@ Line 258: / Line 258: @@
 </pre>
-<p>Where <em>IDENTIFIER</em> is the name of the identifier up to 40
+<p>Where <em>IDENTIFIER</em> is a valid identifier name and <em>COLOR</em> is any valid <code>color</code> specification.</p>
-characters long and <em>COLOR</em> is any valid specification.</p>
+<p class="Note"><strong>Note:</strong> There should be a semi-colon at the end of the declaration. If omitted, it generates a warning and some
-<p class="Note"><strong>Note:</strong> There should be a semi-colon at the
+macros may not work properly.</p>
-end of the declaration. If omitted, it generates a warning and some
+<p>See also: <!--<linkto "Identifiers">Identifiers</linkto>--->[[Reference:Identifiers|Identifiers]] and <!--<linkto "#declare vs. #local">#declare vs. #local</linkto>--->[[Reference:Declare and Local Directives#declare vs. local|#declare vs. #local]] for additional information on identifier naming and scope.</p>
 <p>Here are some examples....</p>
 <pre>

@@ Line 139: / Line 139: @@
 following sub-sections.</p>
 {{#indexentry:Vector, color}}
 {{#indexentry:Color, vectors}}
 {{#indexentry:rgb}}
 <p>The syntax for a color vector is...</p>
 <pre>
@@ Line 182: / Line 182: @@
 ==sRGB Colors==
 <p>
 While POV-Ray will normally expect colors to be expressed in whatever <em>[[Documentation:Tutorial Section 3.3#Gamma in Literal Colors|working gamma space]]</em> you have set via <code>assumed_gamma</code>, as of version 3.7 the <code>srgb</code>,  <code>srgbf</code>, <code>srgbt</code> and <code>srgbft</code> keywords have been added to specify colors encoded according to the sRGB standard (roughly corresponding to a display gamma pre-correction of 2.2). Using these keywords instead of <code>rgb</code>, <code>rgbf</code>, <code>rgbt</code> or <code>rgbft</code>, respectively, instructs POV-Ray to automatically convert the color components to the working gamma space, being approximately equivalent to:</p>
@@ Line 208: / Line 212: @@
 <p class="Note"><strong>Note:</strong> The <code>srgb</code>,  <code>srgbf</code>, <code>srgbt</code> and <code>srgbft</code> keywords do not affect the way filter or transmit components are interpreted; these are always expected to be linear.</p>
 {{#indexentry:Keywords, color}}
 {{#indexentry:Color, keywords}}
@@ Line 213: / Line 218: @@
 {{#indexentry:green}}
 {{#indexentry:blue}}
 <p>The older keyword method of specifying a color is still useful and many
 users prefer it.</p>
@@ Line 243: / Line 246: @@
 be first in the group. See <!--<linkto "Common Color Pitfalls">Common Color Pitfalls</linkto>--->[[Reference:Color Expressions#Common Color Pitfalls|Common Color Pitfalls]] for details.</p>
 {{#indexentry:Color, identifiers}}
 {{#indexentry:Identifiers, color}}
 <p>Color identifiers may be declared to make scene files more readable and to
 parameterize scenes so that changing a single declaration changes many
@@ Line 280: / Line 282: @@
 need to do so is rare.</p>
 {{#indexentry:Color, operators}}
 {{#indexentry:Operators, color}}
 {{#indexentry:gray}}
 <p>Color vectors may be combined in expressions the same as float or vector
 values. Operations are performed on a component by component basis. For
@@ Line 299: / Line 301: @@
 color vector.</p>
 {{#indexentry:Color, Dot Item Access for Colors}}
 <p>POV-Ray provides an easy method to access the individual components of different types of <em>color</em> expressions, as illustrated in the following code examples:</p>
 <pre>
@@ Line 320: / Line 322: @@
 <p>See also: <!--<linkto "Dot Item Access for Vectors">Dot Item Access for Vectors</linkto>--->[[Reference:Vector Expressions#Dot Item Access for Vectors|Dot Item Access for Vectors]].</p>
 {{#indexentry:Color, common pitfalls}}
 {{#indexentry:Pitfalls, color}}
 <p>The variety and complexity of color specification methods can lead to some
 common mistakes. Here are some things to consider when specifying a

@@ Line 314: / Line 314: @@
 #declare Fourth_Component = Color.filter;
 #declare Fifth_Component = Color.transmit;
 </pre>
 <p>See also: <!--<linkto "Dot Item Access for Vectors">Dot Item Access for Vectors</linkto>--->[[Reference:Vector Expressions#Dot Item Access for Vectors|Dot Item Access for Vectors]].</p>

@@ Line 312: / Line 312: @@
 #declare Second_Component = Color.green;
 #declare Third_Component = Color.blue;
-#declare Forth_Component = Color.filter;
+#declare Fourth_Component = Color.filter;
 #declare Fifth_Component = Color.transmit;
 </pre>

@@ Line 315: / Line 315: @@
 #declare Fifth_Component = Color.transmit;
 </pre>
 {{#indexentry:Color, common pitfalls}}

@@ Line 303: / Line 303: @@
 <p>POV-Ray provides an easy method to access the individual components of different types of <em>color</em> expressions, as illustrated in the following code examples:</p>
 <pre>
-#declare Vector = <1, 2, 3>;
+#declare Color = <1, 2, 3>;
-#declare First_Component = Vector.red;
+#declare First_Component = Color.red;
-#declare Second_Component = Vector.green;
+#declare Second_Component = Color.green;
-#declare Third_Component = Vector.blue;
+#declare Third_Component = Color.blue;
-#declare Vector = <1, 2, 3, 4, 5>;
+#declare Color = <1, 2, 3, 4, 5>;
-#declare First_Component = Vector.red;
+#declare First_Component = Color.red;
-#declare Second_Component = Vector.green;
+#declare Second_Component = Color.green;
-#declare Third_Component = Vector.blue;
+#declare Third_Component = Color.blue;
-#declare Forth_Component = Vector.filter;
+#declare Forth_Component = Color.filter;
-#declare Fifth_Component = Vector.transmit;
+#declare Fifth_Component = Color.transmit;
 </pre>
 {{#indexentry:Color, common pitfalls}}
 {{#indexentry:Pitfalls, color}}
 ==Common Color Pitfalls==
 <p>The variety and complexity of color specification methods can lead to some

@@ Line 34: / Line 34: @@
 [[Reference:Vector Expressions#Operator Promotion|Operator Promotion]] and the sections below.</p>
-{{#indexentry:color|colour}}
+{{#indexentry:color}}
 {{#indexentry:filter}}
 {{#indexentry:transmit}}
@@ Line 138: / Line 139: @@
 following sub-sections.</p>
-{{#indexentry:Vector, color|Color, vectors}}
+{{#indexentry:Vector, color}}
 {{#indexentry:rgb}}
 ==Color Vectors==
@@ Line 163: / Line 165: @@
 <p>
-{{#indexentry:rgbf|rgbt|rgbft}}
+{{#indexentry:rgbf}}
 The <code>rgbf</code> keyword requires a four component vector. The 4th
 component is the filter component and the transmit component defaults to
@@ Line 204: / Line 208: @@
 <p class="Note"><strong>Note:</strong> The <code>srgb</code>,  <code>srgbf</code>, <code>srgbt</code> and <code>srgbft</code> keywords do not affect the way filter or transmit components are interpreted; these are always expected to be linear.</p>
-{{#indexentry:Keywords, color|Color, keywords}}
+{{#indexentry:Keywords, color}}
-{{#indexentry:red|green|blue}}
+{{#indexentry:Color, keywords}}
 ==Color Keywords==
@@ Line 236: / Line 243: @@
 be first in the group. See <!--<linkto "Common Color Pitfalls">Common Color Pitfalls</linkto>--->[[Reference:Color Expressions#Common Color Pitfalls|Common Color Pitfalls]] for details.</p>
-{{#indexentry:Color, identifiers|Identifiers, color}}
+{{#indexentry:Color, identifiers}}
 ==Color Identifiers==
@@ Line 272: / Line 280: @@
 need to do so is rare.</p>
-{{#indexentry:Color, operators|Operators, color}}
+{{#indexentry:Color, operators}}
 {{#indexentry:gray}}
 ==Color Operators==
@@ Line 290: / Line 299: @@
 color vector.</p>
-{{#indexentry:Color, common pitfalls|Pitfalls, color}}
+{{#indexentry:Color, common pitfalls}}
 ==Common Color Pitfalls==
 <p>The variety and complexity of color specification methods can lead to some

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