全栈工程师开发手册 (作者:栾鹏)

​​ java教程全解​​

java图片颜色取反色,照片底片模式

测试代码

public static void main(String[] args) {
//文件与BufferedImage间的转换
BufferedImage bi=file2img("test.jpg"); //读取图片
BufferedImage bii=img_inverse(bi);
img2file(bii,"jpg","test1.jpg"); //生成图片
}

图片取反色函数代码

//图片反色
public static BufferedImage img_inverse(BufferedImage imgsrc) {
try {
//创建一个不带透明度的图片
BufferedImage back=new BufferedImage(imgsrc.getWidth(), imgsrc.getHeight(),BufferedImage.TYPE_INT_RGB);
int width = imgsrc.getWidth();
int height = imgsrc.getHeight();
for (int i = 0; i < height; i++) {
for (int j = 0; j < width; j++) {
int pixel = imgsrc.getRGB(j, i);
back.setRGB(j,i,0xFFFFFF-pixel);
}
}
return back;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}

图片的读取和存储

//读取图片
public static BufferedImage file2img(String imgpath) {
try {
BufferedImage bufferedImage=ImageIO.read(new File(imgpath));
return bufferedImage;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
//保存图片,extent为格式,"jpg"、"png"等
public static void img2file(BufferedImage img,String extent,String newfile) {
try {
ImageIO.write(img, extent, new File(newfile));
} catch (Exception e) {
e.printStackTrace();
}
}