Compress image in java

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Java

SQL

Oracle

servlet

I want to know is there a way that i can compress an image which is stored in oracle db as blob
as i am converting blob to base64 image and then returning it in servlet.

JSONObject obj = new JSONObject();

if(!rs.next())
{
	return;
}			

obj.put("NAME", rs.getString("NAME"));
obj.put("address", rs.getString("ADDRESS"));
Blob frontPicBlob =  rs.getBlob("frontPic");
Blob backPicBlob =  rs.getBlob("backPic");

obj.put("frontPic", DatatypeConverter.printBase64Binary(frontPicBlob.getBytes(1,(int)frontPicBlob.length())));
obj.put("backPic",DatatypeConverter.printBase64Binary(backPicBlob.getBytes(1,(int)backPicBlob.length())) );

as images are big is size i want to know if there a way to compress the image . or is there any way to do it efficently