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copied!<p>I add this answer because I think it could be useful to anybody.</p> <p>I step into the problem of setting <a href="https://en.wikipedia.org/wiki/RGBA_color_space" rel="nofollow noreferrer">RGBA</a> colors (that is, RGB color with an Alpha value for transparency) for color display labels in my painting application.</p> <p>As I came across the first answer, I was unable to set an RGBA color. I have also tried things like: </p> <p><code>myLabel.setStyleSheet("QLabel { background-color : %s"%color.name())</code> </p> <p>where <code>color</code> is an RGBA color.</p> <p>So, my dirty solution was to extend <code>QLabel</code> and override <code>paintEvent()</code> method filling its bounding rect.</p> <p>Today, I've open up the <code>qt-assistant</code> and read the <a href="https://doc.qt.io/qt-5/stylesheet-reference.html#list-of-properties" rel="nofollow noreferrer">style reference properties list</a>. Affortunately, it has an example that states the following:</p> <p><code>QLineEdit { background-color: rgb(255, 0, 0) }</code></p> <p>Thats open up my mind in doing something like the code below, as an example:</p> <pre class="lang-py prettyprint-override"><code>myLabel= QLabel() myLabel.setAutoFillBackground(True) # This is important!! color = QtGui.QColor(233, 10, 150) alpha = 140 values = "{r}, {g}, {b}, {a}".format(r = color.red(), g = color.green(), b = color.blue(), a = alpha ) myLabel.setStyleSheet("QLabel { background-color: rgba("+values+"); }") </code></pre> <p>Note that <code>setAutoFillBackground()</code> set in <code>False</code> will not make it work.</p> <p>Regards,</p>

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