本文转载自微信公众号「Java极客技术」,作者鸭血粉丝Tang。转载本文请联系Java极客技术公众号。
一、介绍
在实际的系统开发中,某些业务场景下,我们经常需要给原始图片添加水印,以防止图片信息在互联网上随意传播!
也有的基于当下的业务需求,需要给相机照片加水印、地理位置、时间等信息,以方便记录自己的生活!
例如下图!
有的人可能很容易想到,通过 PS 技术就可以很轻松的完成!
的确,对于单个图像而言很容易,但是对于成千上万的图像,采用人工处理,显然不可取!
问题来了,面对大批量的图像加水印需求,我们应当如何处理呢?
试想一下,如果我们采用人工方式来给图像添加水印,大概的步骤离不开以下几步:
- 1、先获取需要处理的图像
- 2、然后将图像摆放整齐,用尺子计算出我们需要加水印的位置
- 3、采用画笔准确无误的在对应的位置上画上水印
- 4、最后,水印添加之后!
如果采用程序来实现,思路也是一样的,废话也不多说了,代码直接撸上!
二、程序实践
下面我们以java程序为例,给以下图添加一段复印无效的文字水印,并居中!
程序实践如下:
- import org.apache.commons.lang3.StringUtils;
- import javax.imageio.ImageIO;
- import java.awt.*;
- import java.awt.image.BufferedImage;
- import java.io.File;
- /**
- * 给图像添加水印
- * @author pzblog
- * @since 2021-10-29
- */
- public class ImageWaterMarkUtil {
- /**
- * 给图像添加文字水印
- * @param srcImgPath 原始文件地址
- * @param targetImgPath 目标文件地址
- * @param text 水印内容
- * @param color 水印文字颜色
- * @param font 水印文字字体
- * @param alpha 水印透明度
- * @param positionWidth 水印横向位置
- * @param positionHeight 水印纵向位置
- * @param degree 水印图片旋转角度
- * @param location 水印的位置,左上角、右上角、左下角、右下角、居中
- */
- public static void markImage(String srcImgPath,
- String targetImgPath,
- String text,
- Color color,
- Font font,
- float alpha,
- int positionWidth,
- int positionHeight,
- Integer degree,
- String location) {
- try {
- // 1、读取源图片
- Image srcImg = ImageIO.read(new File(srcImgPath));
- int srcImgWidth = srcImg.getWidth(null);
- int srcImgHeight = srcImg.getHeight(null);
- BufferedImage buffImg = new BufferedImage(srcImgWidth, srcImgHeight, BufferedImage.TYPE_INT_RGB);
- // 2、得到画笔对象
- Graphics2D g = buffImg.createGraphics();
- // 3、设置对线段的锯齿状边缘处理
- g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
- g.drawImage(srcImg.getScaledInstance(srcImgWidth, srcImgHeight, Image.SCALE_SMOOTH), 0, 0, null);
- // 4、设置水印旋转
- if (null != degree) {
- g.rotate(Math.toRadians(degree), (double) buffImg.getWidth() / 2, (double) buffImg.getHeight() / 2);
- }
- // 5、设置水印文字颜色
- g.setColor(color);
- // 6、设置水印文字Font
- g.setFont(font);
- // 7、设置水印文字透明度
- g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));
- // 8、水印图片的位置
- int x = 0, y = 0;
- if (StringUtils.equals(location, "left-top")) {
- x = 30;
- y = font.getSize();
- } else if (StringUtils.equals(location, "right-top")) {
- x = srcImgWidth - getWatermarkLength(text, g) - 30;
- y = font.getSize();
- } else if (StringUtils.equals(location, "left-bottom")) {
- x += 30;
- y = buffImg.getHeight() - font.getSize();
- } else if (StringUtils.equals(location, "right-bottom")) {
- x = srcImgWidth - getWatermarkLength(text, g) - 30;
- y = srcImgHeight - font.getSize();
- } else if (StringUtils.equals(location, "center")) {
- x = (srcImgWidth - getWatermarkLength(text, g)) / 2;
- y = srcImgHeight / 2;
- } else {
- //自定义位置
- x = positionWidth;
- y = positionHeight;
- }
- // 9、第一参数->设置的内容,后面两个参数->文字在图片上的坐标位置(x,y)
- g.drawString(text, x, y);
- // 10、释放资源
- g.dispose();
- // 11、生成图片
- ImageIO.write(buffImg, "png", new File(targetImgPath));
- System.out.println("图片完成添加水印文字");
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
- /**
- * 计算填充的水印长度
- * @param text
- * @param g
- * @return
- */
- private static int getWatermarkLength(String text, Graphics2D g) {
- return g.getFontMetrics(g.getFont()).charsWidth(text.toCharArray(), 0, text.length());
- }
- public static void main(String[] args) {
- String srcImgPath = "/Users/pzblog/Desktop/Jietu.jpg"; //原始文件地址
- String targetImgPath = "/Users/pzblog/Desktop/Jietu-copy.jpg"; //目标文件地址
- String text = "复 印 无 效"; //水印文字内容
- Color color = Color.red; //水印文字颜色
- Font font = new Font("宋体", Font.BOLD, 60); //水印文字字体
- float alpha = 0.4f; //水印透明度
- int positionWidth = 320; //水印横向位置坐标
- int positionHeight = 450; //水印纵向位置坐标
- Integer degree = -30; //水印旋转角度
- String location = "center"; //水印的位置
- //给图片添加文字水印
- markImage(srcImgPath, targetImgPath, text, color, font, alpha, positionWidth, positionHeight, degree, location);
- }
- }
运行结果如下:
水印添加成功!
2.1、给图像添加多处文字
有的需求会要求给图像添加多处文字水印,例如下图!
处理过程也很简单!
- import javax.imageio.ImageIO;
- import java.awt.*;
- import java.awt.image.BufferedImage;
- import java.io.File;
- /**
- * 给图像添加水印
- * @author pzblog
- * @since 2021-10-29
- */
- public class ImageFullWaterMarkUtil {
- /**
- * 给图像添加多处文字水印
- * @param srcImgPath 原始文件地址
- * @param targetImgPath 目标文件地址
- * @param text 水印内容
- * @param color 水印文字颜色
- * @param font 水印文字字体
- * @param alpha 水印透明度
- * @param startWidth 水印横向起始位置
- * @param degree 水印图片旋转角度
- * @param interval 高度间隔
- */
- public static void fullMarkImage(String srcImgPath,
- String targetImgPath,
- String text,
- Color color,
- Font font,
- float alpha,
- int startWidth,
- Integer degree,
- Integer interval) {
- try {
- // 1、读取源图片
- Image srcImg = ImageIO.read(new File(srcImgPath));
- int srcImgWidth = srcImg.getWidth(null);
- int srcImgHeight = srcImg.getHeight(null);
- BufferedImage buffImg = new BufferedImage(srcImgWidth, srcImgHeight, BufferedImage.TYPE_INT_RGB);
- // 2、得到画笔对象
- Graphics2D g = buffImg.createGraphics();
- // 3、设置对线段的锯齿状边缘处理
- g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
- g.drawImage(srcImg.getScaledInstance(srcImgWidth, srcImgHeight, Image.SCALE_SMOOTH), 0, 0, null);
- // 4、设置水印旋转
- if (null != degree) {
- g.rotate(Math.toRadians(degree), (double) buffImg.getWidth() / 2, (double) buffImg.getHeight() / 2);
- }
- // 5、设置水印文字颜色
- g.setColor(color);
- // 6、设置水印文字Font
- g.setFont(font);
- // 7、设置水印文字透明度
- g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));
- // 8、水印图片的位置
- int x = startWidth;
- int y = font.getSize();
- int space = srcImgHeight / interval;
- for (int i = 0; i < space; i++) {
- //如果最后一个坐标的y轴比height高,直接退出
- if (((y + font.getSize()) > srcImgHeight) || ((x + getWatermarkLength(text,g)) > srcImgWidth)) {
- break;
- }
- //9、进行绘制
- g.drawString(text, x, y);
- x += getWatermarkLength(text,g);
- y += font.getSize() + interval;
- }
- // 10、释放资源
- g.dispose();
- // 11、生成图片
- ImageIO.write(buffImg, "png", new File(targetImgPath));
- System.out.println("图片完成添加水印文字");
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
- /**
- * 计算填充的水印长度
- * @param text
- * @param g
- * @return
- */
- private static int getWatermarkLength(String text, Graphics2D g) {
- return g.getFontMetrics(g.getFont()).charsWidth(text.toCharArray(), 0, text.length());
- }
- public static void main(String[] args) {
- String srcImgPath = "/Users/pzblog/Desktop/Jietu.jpg"; //原始文件地址
- String targetImgPath = "/Users/pzblog/Desktop/Jietu-copy-full.jpg"; //目标文件地址
- String text = "复 印 无 效"; //水印文字内容
- Color color = Color.red; //水印文字颜色
- Font font = new Font("宋体", Font.BOLD, 30); //水印文字字体
- float alpha = 0.4f; //水印透明度
- int startWidth = 30; //水印横向位置坐标
- Integer degree = -0; //水印旋转角度
- Integer interval = 100; //水印的位置
- //给图片添加文字水印
- fullMarkImage(srcImgPath, targetImgPath, text, color, font, alpha, startWidth, degree, interval);
- }
- }
2.2、给图像添加图片水印
某些情况下,我们还需要给图像添加图片水印,例如下图效果!
处理过程也很简单!
- import org.apache.commons.lang3.StringUtils;
- import javax.imageio.ImageIO;
- import javax.swing.*;
- import java.awt.*;
- import java.awt.image.BufferedImage;
- import java.io.File;
- /**
- * 给图像添加水印
- * @author pzblog
- * @since 2021-10-29
- */
- public class ImageIconWaterMarkUtil {
- /**
- * 给图像添加多处文字水印
- * @param srcImgPath 原始文件地址
- * @param targetImgPath 目标文件地址
- * @param iconImgPath 水印icon
- * @param alpha 水印透明度
- * @param positionWidth 水印横向位置
- * @param positionHeight 水印纵向位置
- * @param degree 水印图片旋转角度
- * @param location 水印的位置,左上角、右上角、左下角、右下角、居中
- */
- public static void fullMarkImage(String srcImgPath,
- String targetImgPath,
- String iconImgPath,
- float alpha,
- int positionWidth,
- int positionHeight,
- Integer degree,
- String location) {
- try {
- // 1、读取源图片
- Image srcImg = ImageIO.read(new File(srcImgPath));
- int srcImgWidth = srcImg.getWidth(null);
- int srcImgHeight = srcImg.getHeight(null);
- BufferedImage buffImg = new BufferedImage(srcImgWidth, srcImgHeight, BufferedImage.TYPE_INT_RGB);
- // 2、得到画笔对象
- Graphics2D g = buffImg.createGraphics();
- // 3、设置对线段的锯齿状边缘处理
- g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
- g.drawImage(srcImg.getScaledInstance(srcImgWidth, srcImgHeight, Image.SCALE_SMOOTH), 0, 0, null);
- // 4、设置水印旋转
- if (null != degree) {
- g.rotate(Math.toRadians(degree), (double) buffImg.getWidth() / 2, (double) buffImg.getHeight() / 2);
- }
- // 5、设置水印文字透明度
- g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));
- // 6、水印图片的路径 水印图片一般为gif或者png的,这样可设置透明度
- ImageIcon imgIcon = new ImageIcon(iconImgPath);
- // 7、得到Image对象。
- Image iconImg = imgIcon.getImage();
- int iconImgWidth = iconImg.getWidth(null);
- int iconImgHeight = iconImg.getHeight(null);
- int x = 0, y = 0;
- if (StringUtils.equals(location, "left-top")) {
- x = iconImgWidth;
- y = iconImgHeight;
- } else if (StringUtils.equals(location, "right-top")) {
- x = srcImgWidth - iconImgWidth - 30;
- y = iconImgHeight;
- } else if (StringUtils.equals(location, "left-bottom")) {
- x += iconImgWidth;
- y = buffImg.getHeight() - iconImgHeight;
- } else if (StringUtils.equals(location, "right-bottom")) {
- x = srcImgWidth - iconImgWidth - 30;
- y = srcImgHeight - iconImgHeight;
- } else if (StringUtils.equals(location, "center")) {
- x = (srcImgWidth - iconImgWidth) / 2;
- y = (srcImgHeight - iconImgHeight) / 2;
- } else {
- //自定义位置
- x = positionWidth;
- y = positionHeight;
- }
- g.drawImage(iconImg, x, y, null);
- g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));
- // 10、释放资源
- g.dispose();
- // 11、生成图片
- ImageIO.write(buffImg, "jpg", new File(targetImgPath));
- System.out.println("图片完成添加图片水印文字");
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
- /**
- * 计算填充的水印长度
- * @param text
- * @param g
- * @return
- */
- private static int getWatermarkLength(String text, Graphics2D g) {
- return g.getFontMetrics(g.getFont()).charsWidth(text.toCharArray(), 0, text.length());
- }
- public static void main(String[] args) {
- String srcImgPath = "/Users/pzblog/Desktop/Jietu.jpg"; //原始文件地址
- String targetImgPath = "/Users/pzblog/Desktop/Jietu-copy-img.jpg"; //目标文件地址
- String iconImgPath = "/Users/pzblog/Desktop/1.png"; //图片水印地址
- float alpha = 0.6f; //水印透明度
- int positionWidth = 320; //水印横向位置坐标
- int positionHeight = 450; //水印纵向位置坐标
- Integer degree = 0; //水印旋转角度
- String location = "center"; //水印的位置
- //给图片添加文字水印
- fullMarkImage(srcImgPath, targetImgPath, iconImgPath, alpha, positionWidth, positionHeight, degree, location);
- }
- }
三、踩坑点
以上实现都很简单,但是在实际的实现过程中,却发现了一个巨大的坑,如果你用的iphone手机拍摄的,按照以上代码进行添加水印,会发现图像突然变横了!
例如下图是原图:
按照上面添加水印的处理,得到的图像结果如下:
很明显,图像旋转了90度!
通过不同拍摄角度的反复测试,发现拍摄角度正常,但是经过程序处理之后,有些是需要旋转 90/180/270 度才能回正。
如果想要在正确的位置加上水印,就必须先对图像进行旋转回到原有的角度,然后再添加水印!
那问题来了,我们如何获取其旋转的角度呢?
经过查阅资料,对于图像的拍摄角度信息,有一个专业的名词:EXIF,EXIF是 Exchangeable Image File的缩写,这是一种专门为数码相机照片设定的格式。
这种格式可以用来记录数字照片的属性信息,例如相机的品牌及型号、相片的拍摄时间、拍摄时所设置的光圈大小、快门速度、ISO等等信息。除此之外它还能够记录拍摄数据,以及照片格式化方式。
通过它,我们可以得知图像的旋转角度信息!
下面,我们就一起来了解下采用 Java 语言如何读取图像的 EXIF 信息,包括如何根据 EXIF 信息对图像进行调整以适合用户浏览。
首先添加 EXIF 依赖包
- <dependency>
- <groupId>com.drewnoakes</groupId>
- <artifactId>metadata-extractor</artifactId>
- <version>2.16.0</version>
- </dependency>
然后读取图像的 EXIF 信息
- import com.drew.imaging.ImageMetadataReader;
- import com.drew.imaging.ImageProcessingException;
- import com.drew.metadata.Directory;
- import com.drew.metadata.Metadata;
- import com.drew.metadata.Tag;
- import java.io.File;
- import java.io.IOException;
- /**
- * @author pzblog
- * @since 2021-10-29
- */
- public class EXIFTest {
- public static void main(String[] args) throws ImageProcessingException, IOException {
- Metadata metadata = ImageMetadataReader.readMetadata(new File("/Users/pzblog/Desktop/11.jpeg"));
- for (Directory directory : metadata.getDirectories()) {
- for (Tag tag : directory.getTags()) {
- System.out.println(String.format("[%s] - %s = %s",
- directory.getName(), tag.getTagName(), tag.getDescription()));
- }
- if (directory.hasErrors()) {
- for (String error : directory.getErrors()) {
- System.err.format("ERROR: %s", error);
- }
- }
- }
- }
- }
输入结果:
- [JPEG] - Compression Type = Baseline
- [JPEG] - Data Precision = 8 bits
- [JPEG] - Image Height = 1080 pixels
- [JPEG] - Image Width = 1440 pixels
- [JPEG] - Number of Components = 3
- [JPEG] - Component 1 = Y component: Quantization table 0, Sampling factors 2 horiz/2 vert
- [JPEG] - Component 2 = Cb component: Quantization table 1, Sampling factors 1 horiz/1 vert
- [JPEG] - Component 3 = Cr component: Quantization table 1, Sampling factors 1 horiz/1 vert
- [JFIF] - Version = 1.1
- [JFIF] - Resolution Units = none
- [JFIF] - X Resolution = 72 dots
- [JFIF] - Y Resolution = 72 dots
- [JFIF] - Thumbnail Width Pixels = 0
- [JFIF] - Thumbnail Height Pixels = 0
- [Exif IFD0] - Orientation = Right side, top (Rotate 90 CW)
- [Exif SubIFD] - Exif Image Width = 1440 pixels
- [Exif SubIFD] - Exif Image Height = 1080 pixels
- [ICC Profile] - Profile Size = 548
- [ICC Profile] - CMM Type = appl
- [ICC Profile] - Version = 4.0.0
- [ICC Profile] - Class = Display Device
- [ICC Profile] - Color space = RGB
- [ICC Profile] - Profile Connection Space = XYZ
- [ICC Profile] - Profile Date/Time = 2017:07:07 13:22:32
- [ICC Profile] - Signature = acsp
- [ICC Profile] - Primary Platform = Apple Computer, Inc.
- [ICC Profile] - Device manufacturer = APPL
- [ICC Profile] - XYZ values = 0.964 1 0.825
- [ICC Profile] - Tag Count = 10
- [ICC Profile] - Profile Description = Display P3
- [ICC Profile] - Profile Copyright = Copyright Apple Inc., 2017
- [ICC Profile] - Media White Point = (0.9505, 1, 1.0891)
- [ICC Profile] - Red Colorant = (0.5151, 0.2412, 65536)
- [ICC Profile] - Green Colorant = (0.292, 0.6922, 0.0419)
- [ICC Profile] - Blue Colorant = (0.1571, 0.0666, 0.7841)
- [ICC Profile] - Red TRC = para (0x70617261): 32 bytes
- [ICC Profile] - Chromatic Adaptation = sf32 (0x73663332): 44 bytes
- [ICC Profile] - Blue TRC = para (0x70617261): 32 bytes
- [ICC Profile] - Green TRC = para (0x70617261): 32 bytes
- [Photoshop] - Caption Digest = 212 29 140 217 143 0 178 4 233 128 9 152 236 248 66 126
- [Huffman] - Number of Tables = 4 Huffman tables
- [File Type] - Detected File Type Name = JPEG
- [File Type] - Detected File Type Long Name = Joint Photographic Experts Group
- [File Type] - Detected MIME Type = image/jpeg
- [File Type] - Expected File Name Extension = jpg
- [File] - File Name = 11.jpeg
- [File] - File Size = 234344 bytes
- [File] - File Modified Date = 星期日 十一月 07 20:05:52 +08:00 2021
其中Orientation标签描述的就是图像旋转的角度。
- [Exif IFD0] - Orientation = Right side, top (Rotate 90 CW)
最后,我们可以通过Orientation信息计算出图像对应的旋转角度。
- import com.alibaba.fastjson.JSON;
- import com.drew.imaging.jpeg.JpegMetadataReader;
- import com.drew.metadata.Directory;
- import com.drew.metadata.Metadata;
- import com.drew.metadata.Tag;
- import java.io.FileInputStream;
- import java.io.IOException;
- import java.io.InputStream;
- /**
- * @author pzblog
- * @since 2021-10-29
- */
- public class TransferImage {
- public static void main(String[] args) throws IOException {
- String path = "/Users/pzblog/Desktop/11.jpeg";
- int result = getImgRotateAngle(new FileInputStream(path));
- System.out.println(result);
- }
- public static int getImgRotateAngle(InputStream inputStream) {
- int rotateAngle = 0;
- try {
- Metadata metadata = JpegMetadataReader.readMetadata(inputStream);
- Iterable<Directory> directories = metadata.getDirectories();
- for (Directory directory : directories) {
- for (Tag tag : directory.getTags()) {
- System.out.println(JSON.toJSONString(tag));
- int tagType = tag.getTagType();
- //照片拍摄角度信息
- if (274 == tagType) {
- String description = tag.getDescription();
- //Left side, bottom (Rotate 270 CW)
- switch (description) {
- //顺时针旋转90度
- case "Right side, top (Rotate 90 CW)":
- rotateAngle = 90;
- break;
- case "Left side, bottom (Rotate 270 CW)":
- rotateAngle = 270;
- break;
- case "Bottom, right side (Rotate 180)":
- rotateAngle = 180;
- break;
- default:
- rotateAngle = 0;
- break;
- }
- }
- }
- }
- return rotateAngle;
- } catch (Exception e) {
- return 0;
- }
- }
- }
输出的旋转角度结果:
- 90
接着通过旋转角度参数,对图像进行回正
- import javax.imageio.ImageIO;
- import java.awt.*;
- import java.awt.image.BufferedImage;
- import java.io.File;
- import java.io.IOException;
- /**
- * @author panzhi
- * @since 2021-10-29
- */
- public class RotateImage {
- public static BufferedImage rotate(Image src, int angel) {
- int src_width = src.getWidth(null);
- int src_height = src.getHeight(null);
- // calculate the new image size
- Rectangle rect_des = calcRotatedSize(new Rectangle(new Dimension(
- src_width, src_height)), angel);
- BufferedImage res = null;
- res = new BufferedImage(rect_des.width, rect_des.height,
- BufferedImage.TYPE_INT_RGB);
- Graphics2D g2 = res.createGraphics();
- // transform
- g2.translate((rect_des.width - src_width) / 2,
- (rect_des.height - src_height) / 2);
- g2.rotate(Math.toRadians(angel), src_width / 2, src_height / 2);
- g2.drawImage(src, null, null);
- return res;
- }
- public static Rectangle calcRotatedSize(Rectangle src, int angel) {
- // if angel is greater than 90 degree, we need to do some conversion
- if (angel >= 90) {
- if(angel / 90 % 2 == 1){
- int temp = src.height;
- src.height = src.width;
- src.width = temp;
- }
- angel = angel % 90;
- }
- double r = Math.sqrt(src.height * src.height + src.width * src.width) / 2;
- double len = 2 * Math.sin(Math.toRadians(angel) / 2) * r;
- double angel_alpha = (Math.PI - Math.toRadians(angel)) / 2;
- double angel_dalta_width = Math.atan((double) src.height / src.width);
- double angel_dalta_height = Math.atan((double) src.width / src.height);
- int len_dalta_width = (int) (len * Math.cos(Math.PI - angel_alpha
- - angel_dalta_width));
- int len_dalta_height = (int) (len * Math.cos(Math.PI - angel_alpha
- - angel_dalta_height));
- int des_width = src.width + len_dalta_width * 2;
- int des_height = src.height + len_dalta_height * 2;
- return new java.awt.Rectangle(new Dimension(des_width, des_height));
- }
- public static void main(String[] args) throws IOException {
- BufferedImage src = ImageIO.read(new File("/Users/pzblog/Desktop/11.jpeg"));
- BufferedImage des = RotateImage.rotate(src, 90);
- ImageIO.write(des, "jpg", new File("/Users/pzblog/Desktop/11-rotate.jpeg"));
- }
- }
最后给回正后的图像添加水印
- public static void main(String[] args) {
- String srcImgPath = "/Users/pzblog/Desktop/11-rotate.jpeg"; //原始文件地址
- String targetImgPath = "/Users/pzblog/Desktop/1-rotate-copy.jpg"; //目标文件地址
- String text = "复 印 无 效"; //水印文字内容
- Color color = Color.red; //水印文字颜色
- Font font = new Font("宋体", Font.BOLD, 60); //水印文字字体
- float alpha = 0.4f; //水印透明度
- int positionWidth = 320; //水印横向位置坐标
- int positionHeight = 450; //水印纵向位置坐标
- Integer degree = -30; //水印旋转角度
- String location = "center"; //水印的位置
- //给图片添加文字水印
- markImage(srcImgPath, targetImgPath, text, color, font, alpha, positionWidth, positionHeight, degree, location);
- }
输入结果:
添加水印的结果与预期一致!
四、小结
给图像添加水印最坑的地方就上面介绍的那个位置,如果是网络截图的照片,基本添加的结果与预期一致,但是采用手机拍摄的,很有可能会发生旋转,因此需要采用一些手法,先获取对应的图像旋转角度,然后进行回正,最后添加水印,保证与预期结果一致!