Bug 179431 [Automation]Chart background color issue[0602]
Details: [Automation]Chart background color issue[0602] Step: 1. Add a chart and set output format as jpg/bmp. 2. Add a chart and set output format as png/svg. Actual result: Step 1: Background color of chart is baby blue. Step 2: Background color of chart is black.
chart/org.eclipse.birt.chart.device.extension/src/org/eclipse/birt/chart/device/image/JavaxImageIOWriter.java
if ( s != null )
			{
				Iterator it = ImageIO.getImageWritersByMIMEType( s );
				if ( it.hasNext( ) )
				{
					supported = true;
				}
			}
		}
		return supported;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.device.IDeviceRenderer#before()
	 */
	public void before( ) throws ChartException
	{
		super.before( );
		_bImageExternallySpecified = ( _img != null );
		
		
		if ( !_bImageExternallySpecified )
		{
			if ( _bo == null ) 
			
			{
				throw new ChartException( ChartDeviceExtensionPlugin.ID,
						ChartException.RENDERING,
						"JavaxImageIOWriter.exception.no.bounds",