用Java壓縮png

Question

我想使用im4java用graphicsmagick或ImageMagick壓縮png，有人可以幫助我嗎？ 我發現

 package example;
import com.googlecode.pngtastic.core.PngImage;
import com.googlecode.pngtastic.core.PngOptimizer;

import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.InputStream;

/**
 * Example pngtastic image optimization usage from java
 */
public class Test {

    public static void main(String[] args) throws Exception {
        // load png image from a file
        final InputStream in = new BufferedInputStream(new FileInputStream("/input.png"));
        final PngImage image = new PngImage(in);

        // optimize
        final PngOptimizer optimizer = new PngOptimizer();
        final PngImage optimizedImage = optimizer.optimize(image);

        // export the optimized image to a new file
        final ByteArrayOutputStream optimizedBytes = new ByteArrayOutputStream();
        optimizedImage.writeDataOutputStream(optimizedBytes);
        optimizedImage.export("/output.png", optimizedBytes.toByteArray());
    }
}

使用pngtastic，但在壓縮198.3kB之前和壓縮179.6kB之后圖像非常小

Answer 1

我在Linux上找到了pngnq，可以安裝並使用Runtime.getRuntime().exec("pngnq <file png>"); 在java中