Image compress and save helpers

gistfile1.java

private void buildImage(BufferedImage sourceImage, int width, int height, String imageType, Object target, float quality) throws IOException {
    ImageWriter imageWriter = writerFor(imageType, target);
    ImageWriteParam imageWriteParam = compressionParametersFor(imageWriter, quality);
    imageWriter.write(null, new IIOImage(sourceImage, null, null), imageWriteParam);
    imageWriter.dispose();
}

private ImageWriter writerFor(String imageType, Object target) throws IOException {
    ImageWriter imageWriter = ImageIO.getImageWritersByFormatName(imageType).next();
    imageWriter.setOutput(target);
    return imageWriter;
}

private ImageWriteParam compressionParametersFor(ImageWriter imageWriter, float quality) {
    ImageWriteParam imageWriteParam = imageWriter.getDefaultWriteParam();
    imageWriteParam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
    imageWriteParam.setCompressionQuality(quality);
    return imageWriteParam;
}