public void setSuggestedPalette(PNGSuggestedPaletteEntry[] palette) {
        suggestedPalette = (PNGSuggestedPaletteEntry[])(palette.clone());
        suggestedPaletteSet = true;
    }
Sets the suggested palette information to be stored with this
image.  The information is passed to this method as an array of
<code>PNGSuggestedPaletteEntry</code> objects.

<p> The 'sPLT' chunk will encode this information.
plugins/svg-plugin/batik-codec-fix/src/main/java/org/apache/batik/ext/awt/image/codec/png/PNGEncodeParam.java