ound color:<br>
<img width="85" height="62" src="./images/png/rgba8.png" alt="[Test image]">
</p>

<p><b>(T5)</b> 64-bit RGBA, includes background color:<br>
<img width="85" height="62" src="./images/png/rgba16_bk.png" alt="[Test image]">
</p>

<p><b>(T6)</b> 64-bit RGBA, no background color:<br>
<img width="85" height="62" src="./images/png/rgba16.png" alt="[Test image]">
</p>

<h3>RGB binary transparency</h3>

<p>Expected result:<br>
<img width="95" height="72" src="./images/png/resultb_ok.gif" alt="[Test