Question

关于通过java实现图片格式的转换

关于通过java实现图片格式的转换

Answer 1

import java.io.*; import java.awt.*; import java.awt.image.*;

import java.awt.Graphics; import java.awt.color.ColorSpace;

import javax.imageio.ImageIO;

public class ImageCut {

/**

* 缩放图像

* @param srcImageFile源图像文件地址

* @param result缩放后的图像地址

* @param scale缩放比例

* @param flag缩放选择:true 放大; false 缩小;

*/

public static void scale(String srcImageFile, String result, int scale,

boolean flag) {

try {

BufferedImage src = ImageIO.read(new File(srcImageFile)); // 读入文件

int width = src.getWidth(); // 得到源图宽

int height = src.getHeight(); // 得到源图长

if (flag) {// 放大

width = width * scale;

height = height * scale;

} else {// 缩小

width = width / scale;

height = height / scale;

}

Image image = src.getScaledInstance(width, height,

Image.SCALE_DEFAULT);

BufferedImage tag = new BufferedImage(width, height,

BufferedImage.TYPE_INT_RGB);

Graphics g = tag.getGraphics();

g.drawImage(image, 0, 0, null); // 绘制缩小后的图

g.dispose();

ImageIO.write(tag, "JPEG", new File(result));// 输出到文件流

} catch (IOException e) {

e.printStackTrace();

}

}

/**

* 图像切割

* @param srcImageFile源图像地址

* @param descDir切片目标文件夹

* @param destWidth目标切片宽度

* @param destHeight目标切片高度

*/

public static void cut(String srcImageFile, String descDir, int destWidth,

int destHeight) {

try {

Image img;

ImageFilter cropFilter; // 读取源图像

BufferedImage bi = ImageIO.read(new File(srcImageFile));

int srcWidth = bi.getHeight(); // 源图宽度

int srcHeight = bi.getWidth(); // 源图高度

if (srcWidth > destWidth && srcHeight > destHeight) {

Image image = bi.getScaledInstance(srcWidth, srcHeight,

Image.SCALE_DEFAULT);

destWidth = 200; // 切片宽度

destHeight = 150; // 切片高度

int cols = 0; // 切片横向数量

int rows = 0; // 切片纵向数量

// 计算切片的横向和纵向数量

if (srcWidth % destWidth == 0) {

cols = srcWidth / destWidth;

} else {

cols = (int) Math.floor(srcWidth / destWidth) + 1;

}

if (srcHeight % destHeight == 0) {

rows = srcHeight / destHeight;

} else {

rows = (int) Math.floor(srcHeight / destHeight) + 1;

}

// 循环建立切片

// 改进的想法:是否可用多线程加快切割速度

for (int i = 0; i < rows; i++) {

for (int j = 0; j < cols; j++) {

// 四个参数分别为图像起点坐标和宽高

// 即: CropImageFilter(int x,int y,int width,int height)

cropFilter = new CropImageFilter(j * 200, i * 150,

destWidth, destHeight);

img = Toolkit.getDefaultToolkit().createImage(

new FilteredImageSource(image.getSource(),

cropFilter));

BufferedImage tag = new BufferedImage(destWidth,

destHeight, BufferedImage.TYPE_INT_RGB);

Graphics g = tag.getGraphics();

g.drawImage(img, 0, 0, null); // 绘制缩小后的图

g.dispose();

// 输出为文件

ImageIO.write(tag, "JPEG", new File(descDir

+ "pre_map_" + i + "_" + j + ".jpg"));

}

}

}

} catch (Exception e) {

e.printStackTrace();

}

}

// 图像类型转换GIF->JPG GIF->PNG PNG->JPG PNG->GIF(X)

public static void convert(String source, String result) {

try {

File f = new File(source);

f.canRead();

f.canWrite();

BufferedImage src = ImageIO.read(f);

ImageIO.write(src, "JPG", new File(result));

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

// 彩色转为黑白

public static void gray(String source, String result) {

try {

BufferedImage src = ImageIO.read(new File(source));

ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY);

ColorConvertOp op = new ColorConvertOp(cs, null);

src = op.filter(src, null);

ImageIO.write(src, "JPEG", new File(result));

} catch (IOException e) {

e.printStackTrace();

}

}

public static void main(String［］ args) {

//cut("e:/1.jpg", "e:/t/", 200, 150);

}

}

import java.io.*; import java.awt.*; import java.awt.image.*;

import java.awt.Graphics; import java.awt.color.ColorSpace;

import javax.imageio.ImageIO;

public class ImageCut {

/**

* 缩放图像

* @param srcImageFile源图像文件地址

* @param result缩放后的图像地址

* @param scale缩放比例

* @param flag缩放选择:true 放大; false 缩小;

*/

public static void scale(String srcImageFile, String result, int scale,

boolean flag) {

try {

BufferedImage src = ImageIO.read(new File(srcImageFile)); // 读入文件

int width = src.getWidth(); // 得到源图宽

int height = src.getHeight(); // 得到源图长

if (flag) {// 放大

width = width * scale;

height = height * scale;

} else {// 缩小

width = width / scale;

height = height / scale;

}

Image image = src.getScaledInstance(width, height,

Image.SCALE_DEFAULT);

BufferedImage tag = new BufferedImage(width, height,

BufferedImage.TYPE_INT_RGB);

Graphics g = tag.getGraphics();

g.drawImage(image, 0, 0, null); // 绘制缩小后的图

g.dispose();

ImageIO.write(tag, "JPEG", new File(result));// 输出到文件流

} catch (IOException e) {

e.printStackTrace();

}

}

/**

* 图像切割

* @param srcImageFile源图像地址

* @param descDir切片目标文件夹

* @param destWidth目标切片宽度

* @param destHeight目标切片高度

*/

public static void cut(String srcImageFile, String descDir, int destWidth,

int destHeight) {

try {

Image img;

ImageFilter cropFilter; // 读取源图像

BufferedImage bi = ImageIO.read(new File(srcImageFile));

int srcWidth = bi.getHeight(); // 源图宽度

int srcHeight = bi.getWidth(); // 源图高度

if (srcWidth > destWidth && srcHeight > destHeight) {

Image image = bi.getScaledInstance(srcWidth, srcHeight,

Image.SCALE_DEFAULT);

destWidth = 200; // 切片宽度

destHeight = 150; // 切片高度

int cols = 0; // 切片横向数量

int rows = 0; // 切片纵向数量

// 计算切片的横向和纵向数量

if (srcWidth % destWidth == 0) {

cols = srcWidth / destWidth;

} else {

cols = (int) Math.floor(srcWidth / destWidth) + 1;

}

if (srcHeight % destHeight == 0) {

rows = srcHeight / destHeight;

} else {

rows = (int) Math.floor(srcHeight / destHeight) + 1;

}

// 循环建立切片

// 改进的想法:是否可用多线程加快切割速度

for (int i = 0; i < rows; i++) {

for (int j = 0; j < cols; j++) {

// 四个参数分别为图像起点坐标和宽高

// 即: CropImageFilter(int x,int y,int width,int height)

cropFilter = new CropImageFilter(j * 200, i * 150,

destWidth, destHeight);

img = Toolkit.getDefaultToolkit().createImage(

new FilteredImageSource(image.getSource(),

cropFilter));

BufferedImage tag = new BufferedImage(destWidth,

destHeight, BufferedImage.TYPE_INT_RGB);

Graphics g = tag.getGraphics();

g.drawImage(img, 0, 0, null); // 绘制缩小后的图

g.dispose();

// 输出为文件

ImageIO.write(tag, "JPEG", new File(descDir

+ "pre_map_" + i + "_" + j + ".jpg"));

}

}

}

} catch (Exception e) {

e.printStackTrace();

}

}

// 图像类型转换GIF->JPG GIF->PNG PNG->JPG PNG->GIF(X)

public static void convert(String source, String result) {

try {

File f = new File(source);

f.canRead();

f.canWrite();

BufferedImage src = ImageIO.read(f);

ImageIO.write(src, "JPG", new File(result));

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

// 彩色转为黑白

public static void gray(String source, String result) {

try {

BufferedImage src = ImageIO.read(new File(source));

ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY);

ColorConvertOp op = new ColorConvertOp(cs, null);

src = op.filter(src, null);

ImageIO.write(src, "JPEG", new File(result));

} catch (IOException e) {

e.printStackTrace();

}

}

public static void main(String［］ args) {

//cut("e:/1.jpg", "e:/t/", 200, 150);

}

}

参考文献：http://www.cqtarena.com