我有一个接收图像文件的java应用程序。我想使用exif信息旋转它们。
在StackOverflow上,我找到了两种不同的方法,在两种情况下我都以BufferedImage开头:
BufferedImage image=ImageIO.read(sourceFile.getInputStream());
第一个解决方案来自this post。
ImageTransformer.ImageInformation imageInformation=ImageTransformer.readImageInformation(sourceFile.getInputStream());
AffineTransform tranform=ImageTransformer.getExifTransformation(imageInformation);
image=ImageTransformer.transformImage(image,tranform);
在这里的一些帖子中也推荐了第二个,使用Thumbnailator:
BufferedImage image = Thumbnails.of(sourceFile.getInputStream()).scale(1).asBufferedImage();
两种方式都可以正确旋转我的图像。但是这两种解决方案都会改变颜色,这是我不想要的。我会附上两个文件," white"一个是旋转错误的原始文件。这正是我在注释掉两个旋转代码时所实现的。
如何仅通过更改旋转来获得原始颜色?
答案 0 :(得分:2)
我遇到了同样的问题,事实证明您不应该将一种格式转换为另一种格式(BufferedImage转换为ByteArrayOutputStream,反之亦然)。如果您有字节数组,请使用ByteArrayOutputStream和ByteArrayInputStream。
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ldap_set_option($ldapResource, LDAP_OPT_REFERRALS, 0);
ldap_bind($ldapResource, "CN=My company standard Account, OU=*******", "account_password");
答案 1 :(得分:1)
我一直试图将图像的中心与框架的中心对齐,但我没有找到一种好的方法,但我设法旋转图像而不会失去其属性:
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JComponent;
public class Rotate extends JComponent {
// Attributes
private String route = null;
private double degree = 0.0;
// Constructor
public Rotate(String route, double degree) {
this.setRoute(route);
this.setDegree(degree);
}
// Create a bufferedImage for the given route
private BufferedImage getBufferedImage() {
Image image = null;
try {
image = ImageIO.read(new File(getRoute()));
} catch (IOException e) {
e.printStackTrace();
}
return (BufferedImage) image;
}
// Paint the image
public void paint(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
AffineTransform at = AffineTransform.getRotateInstance(Math.toRadians(getDegree()));
g2.setTransform(at);
// Here I tried to calculate you must add the coordenates to start
// drawing the image in your frame
g2.drawImage(getBufferedImage(), 0, 0, null);
}
public double getDiagonal() {
return Math.hypot(getBufferedImage().getWidth(), getBufferedImage().getHeight());
}
public String getRoute() {
return route;
}
public void setRoute(String route) {
this.route = route;
}
public double getDegree() {
return degree;
}
public void setDegree(double degree) {
this.degree = degree;
}
}
进行测试:
import java.awt.Container;
import javax.swing.JFrame;
public class ImageRotation {
public static void main(String[] args) {
// The route of the image and the degrees of rotation
String route = "C:\\Users\\Public\\Pictures\\Sample Pictures\\download.jpg";
double degrees = 30;
// Frame to display the image
JFrame jf = new JFrame("Image Rotated");
// Introduce the route and degrees
Rotate tl = new Rotate(route, degrees);
// Set the size of the frame
int hyp = (int) tl.getDiagonal();
jf.setSize(hyp, hyp);
// Print the rotated image in the frame
Container cp = jf.getContentPane();
cp.add(tl);
// Display
jf.setVisible(true);
}
}