t:<br>
<img width="95" height="72" src="./images/png/resultgb.gif" alt="[Test image]">
</p>

<p><b>(G5)</b> 8 bpp grayscale (8 gray), includes background color:<br>
<img width="85" height="62" src="./images/png/gray8b_bk.png" alt="[Test image]">
</p>

<p><b>(G6)</b> 8 bpp grayscale (8 gray), no background color:<br>
<img width="85" height="62" src="./images/png/gray8b.png" alt="[Test image]">
</p>

<p><b>(G7)</b> 16 bpp grayscale (16 gray), includes background color:<br>
<img width="85" height="62" src="./i