如何转换PNG < - > JPEG < - > TIFF图像

Question

is there any way I can convert PNG<->JPEG<->TIFF images in Java? I have String i/p passing parameter (PNG or JPEG converted to []byte which get converted to String) to ConvertImage(String xyz) method.

String ConvertImage(String xyz)

So I am looking for following conversion from single method and return byte array or string and then finally I want to store in DB.

1.if i/p is PNG converted o/p is JPEG

2.if i/p is JPEG converted o/p is PNG

3.If i/p is PNG or JPEG converted o/p is TIFF

I am using JAI right now for this conversion(In my prev post I did not mention all these details sorry about that) but don't want to use JAI now.

Please let me know if you have any quick solution for all these 3 types?

Thank you very much in advance!!!

Answer 1

Most image types can be read into memory using a simple call to ImageIO.read :

import javax.imageio.ImageIO;
import java.io.File;

public class ImageTest {
    public static void main(String[] args) {
        BufferedImage image = ImageIO.read(new File("image.png"));//Or image.jpg or image.tiff, etc.
    }
}

Writing images can then be done by passing a RenderedImage (which BufferedImage is an implementation of) to ImageIO.write :

import javax.imageio.ImageIO;
import java.io.File;

public class ImageTest {
    public static void main(String[] args) {
        BufferedImage image = ImageIO.read(new File("image.png"));//Or image.jpg or image.tiff, etc.
        String[] formatNames = ImageIO.getWriterFormatNames();
        //A robust use would validate whatever format you're intending to use against 
        //the canonical list of format names retrieved by that call
        ImageIO.write(image, "tiff", new File("image.tiff"));
    }
}