[css-color-5] Added sample javascript code for naively converting from device-cmyk

Author: svgeesus

css-color-5/Overview.bs

@@ -3508,6 +3508,30 @@ unless trailing zeroes have been omitted.
 		}
 		</pre>
 
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+
+<h2 id="color-conversion-code">
+Sample code for Color Conversions</h2>
+
+<em>This section is not normative.</em>
+
+The naive conversion from device-cmyk is trivial:
+
+<pre class="include-code lang-javascript">
+	path: naive.js
+	highlight: js
+</pre>
+
+
+
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css-color-5/naive.js

@@ -0,0 +1,9 @@
+function naive(cmyk) {
+  // naively convert an array of CMYK values
+  // to sRGB
+  let [cyan, magenta, yellow, black] = cmyk;
+    let red = 1 - Math.min(1, cyan * (1 - black) + black);
+    let green = 1 - Math.min(1, magenta * (1 - black) + black);
+    let blue = 1 - Math.min(1, yellow * (1 - black) + black);
+    return [red, green, blue];
+}