ImageWriter writer = getPreferredImageWriter(format);
if (writer != null) {
ImageWriteParam param = writer.getDefaultWriteParam();
// compression
if (param.canWriteCompressed()) {
param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
properties.setProperty(formatKey + COMPRESS, true);
String[] compressionTypes = param.getCompressionTypes();
String compressionType = param.getCompressionType();
properties.setProperty(formatKey + COMPRESS_MODE, compressionType != null ? compressionType : compressionTypes[0]);