public void setSignificantBits(int[] significantBits) {
        this.significantBits = (int[])(significantBits.clone());
        significantBitsSet = true;
    }
Sets the number of significant bits for each band of the image.

<p> The number of entries in the <code>significantBits</code>
array must be equal to the number of output bands in the image:
1 for a gray image, 2 for gray+alpha, 3 for index or truecolor,
and 4 for truecolor+alpha.

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