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<p>that are used.</p>

<p><big> History </big></p>
<p>The concept of an alpha channel was introduced by <a href="page.php?w=Alvy_Ray_Smith">Alvy Ray Smith</a> and <a href="page.php?w=Ed_Catmull">Ed Catmull</a> in the late 1970s at the <a href="page.php?w=New_York_Institute_of_Technology_Computer_Graphics_Lab">New York Institute of Technology Computer Graphics Lab</a>. Bruce A. Wallace derived the same straight <b>over</b> operator based on a physical <a href="page.php?w=reflectance">reflectance</a>/<a href="page.php?w=transmittance">transmittance</a> model</p><p>
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