protected void writeImageFileHeader(final AbstractBinaryOutputStream bos) throws IOException {
        writeImageFileHeader(bos, TiffConstants.HEADER_SIZE);
    }
Check an image to see if any of its pixels are non-opaque.

@param src a valid image
@return true if at least one non-opaque pixel is found.
src/main/java/org/apache/commons/imaging/formats/tiff/write/AbstractTiffImageWriter.java