> (4-bit) palette, binary transparency only, no background color:<br>
Expected result:<br>
<img width="95" height="72" src="./images/png/resultb_ok.gif" alt="[Test image]"><br>
<img width="85" height="62" src="./images/png/palb.png" alt="[Test image]"><br>
(This tests a few things that may have slipped through the cracks.)
</p>

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