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关于用java实现图片格式的转换
目前已实现bmp解析，以及jpeg编码成jpg文件
<code>;
package com.wannaberer.test;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.*;
import com.sun.image.codec.jpeg.*;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.awt.image.ImageObserver;
import java.awt.image.MemoryImageSource;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
public class TransImg {
MediaTracker tracker = new MediaTracker(new Component() {
});
//构造函数
public TransImg() {
}
//解析bmp文件
public Image loadbitmap(String sdir, String sfile) throws IOException {
Image image;
System.out.println("loading:" + sdir + sfile);
FileInputStream fs = new FileInputStream(sdir + sfile);
//读取14位bitmap文件头
int bflen = 14;
byte bf[] = new byte[bflen];
fs.read(bf, 0, bflen);
//读取40位bitmap信息头
int bilen = 40;
byte bi[] = new byte[bilen];
fs.read(bi, 0, bilen);
//解释数据。
int nsize = (((int) bf[5] & 0xff) << 24)
| (((int) bf[4] & 0xff) << 16)
| (((int) bf[3] & 0xff) <<  | (int) bf[2] & 0xff;
System.out.println("File type is :" + (char) bf[0] + (char) bf[1]);
System.out.println("Size of file is :" + nsize);
int nbisize = (((int) bi[3] & 0xff) << 24)
| (((int) bi[2] & 0xff) << 16)
| (((int) bi[1] & 0xff) << | (int) bi[0] & 0xff;
System.out.println("Size of bitmapinfoheader is :" + nbisize);
int nwidth = (((int) bi[7] & 0xff) << 24)
| (((int) bi[6] & 0xff) << 16)
| (((int) bi[5] & 0xff) << | (int) bi[4] & 0xff;
System.out.println("Width is :" + nwidth);
int nheight = (((int) bi[11] & 0xff) << 24)
| (((int) bi[10] & 0xff) << 16)
| (((int) bi[9] & 0xff) << | (int) bi[8] & 0xff;
System.out.println("Height is :" + nheight);
int nplanes = (((int) bi[13] & 0xff) << | (int) bi[12] & 0xff;
System.out.println(" lanes is :" + nplanes);
int nbitcount = (((int) bi[15] & 0xff) << | (int) bi[14] & 0xff;
System.out.println("BitCount is :" + nbitcount);
//查找表明压缩的非零值
int ncompression = (((int) bi[19]) << 24) | (((int) bi[18]) << 16)
| (((int) bi[17]) << | (int) bi[16];
System.out.println("Compression is :" + ncompression);
int nsizeimage = (((int) bi[23] & 0xff) << 24)
| (((int) bi[22] & 0xff) << 16)
| (((int) bi[21] & 0xff) << | (int) bi[20] & 0xff;
System.out.println("SizeImage is :" + nsizeimage);
int nxpm = (((int) bi[27] & 0xff) << 24)
| (((int) bi[26] & 0xff) << 16)
| (((int) bi[25] & 0xff) << | (int) bi[24] & 0xff;
System.out.println("X-Pixels per meter is :" + nxpm);
int nypm = (((int) bi[31] & 0xff) << 24)
| (((int) bi[30] & 0xff) << 16)
| (((int) bi[29] & 0xff) << | (int) bi[28] & 0xff;
System.out.println("Y-Pixels per meter is :" + nypm);
int nclrused = (((int) bi[35] & 0xff) << 24)
| (((int) bi[34] & 0xff) << 16)
| (((int) bi[33] & 0xff) << 8) | (int) bi[32] & 0xff;
System.out.println("Colors used are :" + nclrused);
int nclrimp = (((int) bi[39] & 0xff) << 24)
| (((int) bi[38] & 0xff) << 16)
| (((int) bi[37] & 0xff) << 8) | (int) bi[36] & 0xff;
System.out.println("Colors important are :" + nclrimp);
if (nbitcount == 24) {
//24 位格式不包含调色板数据，但扫描行被补足到4 个字节。
int npad = (nsizeimage / nheight) - nwidth * 3;
int ndata[] = new int[nheight * nwidth];
byte brgb[] = new byte[(nwidth + npad) * 3 * nheight];
fs.read(brgb, 0, (nwidth + npad) * 3 * nheight);
//从第0行开始扫描
int nindex = 0;
for (int j = 0; j < nheight; j++) {
//
for (int i = 0; i < nwidth; i++) {
ndata[nwidth * (nheight - j - 1) + i] = (255 & 0xff) << 24
| (((int) brgb[nindex + 2] & 0xff) << 16)
| (((int) brgb[nindex + 1] & 0xff) << 8)
| (int) brgb[nindex] & 0xff;
/*
* System.out.println("Encoded Color at (" +i + "," + j + " is:" + nrgb + " (R,G,B)= (" + ( (int) (brgb[2]) & 0xff) + "," + ( (int) brgb[1] & 0xff) + "," + ( (int) brgb[0] & 0xff) + ""; }
*/
nindex += 3;
}
nindex += npad;
}
image = Toolkit.getDefaultToolkit()
.createImage(
new MemoryImageSource(nwidth, nheight, ndata,
0, nwidth));
} else if (nbitcount == 8) {
// 必须确定颜色数。如果 clrsused 参数大于 0，
// 则颜色数由它决定。如果它等于 0，则根据
// bitsperpixel 计算颜色数。
int nNumColors = 0;
if (nclrused >; 0) {
nNumColors = nclrused;
} else {
nNumColors = (1 & 0xff) << nbitcount;
}
System.out.println("The number of Colors is" + nNumColors);
// 某些位图不计算 sizeimage 域，请找出这些情况并对它们进行修正。
if (nsizeimage == 0) {
nsizeimage = ((((nwidth * nbitcount) + 31) & ~31) >;>; 3);
nsizeimage *= nheight;
System.out.println("nsizeimage (backup) is" + nsizeimage);
}
// 读取调色板颜色。
int npalette[] = new int[nNumColors];
byte bpalette[] = new byte[nNumColors * 4];
fs.read(bpalette, 0, nNumColors * 4);
int nindex8 = 0;
for (int n = 0; n < nNumColors; n++) {
npalette[n] = (255 & 0xff) << 24
| (((int) bpalette[nindex8 + 2] & 0xff) << 16)
| (((int) bpalette[nindex8 + 1] & 0xff) << 8)
| (int) bpalette[nindex8] & 0xff;
/**System.out.println ("alette Color "+n +" is:" + npalette[n] + " (res,R,G,B)= (" + ( (int) (bpalette[nindex8 + 3]) & 0xff) + "," + ( (int) (bpalette[nindex8 + 2]) & 0xff) + "," + ( (int) bpalette[nindex8 + 1] & 0xff) + "," + ( (int) bpalette[nindex8] & 0xff) + ""; */
nindex8 += 4;
}
// 读取图像数据（实际上是调色板的索引）扫描行仍被补足到 4 个字节。
int npad8 = (nsizeimage / nheight) - nwidth;
System.out.println("nPad is:" + npad8);
int ndata8[] = new int[nwidth * nheight];
byte bdata[] = new byte[(nwidth + npad8) * nheight];
fs.read(bdata, 0, (nwidth + npad8) * nheight);
nindex8 = 0;
for (int j8 = 0; j8 < nheight; j8++) {
for (int i8 = 0; i8 < nwidth; i8++) {
ndata8[nwidth * (nheight - j8 - 1) + i8] = npalette[((int) bdata[nindex8] & 0xff)];
nindex8++;
}
nindex8 += npad8;
}
image = Toolkit.getDefaultToolkit().createImage(
new MemoryImageSource(nwidth, nheight, ndata8, 0,
nwidth));
} else {
System.out
.println("Not a 24-bit or 8-bit Windows Bitmap, aborting...";
image = (Image) null;
}
fs.close();
return image;
}
public void waitForImage(Image image) {
// tracker = new MediaTracker(this);
try {
tracker.addImage(image, 0); //public void addImage(Image image,int id)
// tracker.waitForAll();
tracker.waitForID(0);
tracker.checkAll(true);
/** while(!tracker.checkID(0)) { tracker.waitForID(0); }*/
if (tracker.isErrorAny()) {
System.out.println("加载图像出现错误！";
System.exit(0);
}
// loadStatus = tracker.statusID( 0, false );
// tracker.removeImage(image, 0);
} catch (InterruptedException e) {
e.printStackTrace();
}
}// waitForImage
//边界检测
public void checkImage(Image image) {
waitForImage(image);
int imageWidth = image.getWidth(null);
if (imageWidth < 1) {
throw new IllegalArgumentException("image width " + imageWidth
+ " is out of range";
}
int imageHeight = image.getHeight(null);
if (imageHeight < 1) {
throw new IllegalArgumentException("image height " + imageHeight
+ " is out of range";
}
// System.out.println( "Image size=" + imageWidth + "x" + imageHeight );
}// checkImage
//jpeg编码实现
public void encodeJPEG(OutputStream outputStream, Image outputImage,
float outputQuality) throws java.io.IOException {
int outputWidth = outputImage.getWidth(null);
if (outputWidth < 1) {
throw new IllegalArgumentException("output image width "
+ outputWidth + " is out of range";
}
int outputHeight = outputImage.getHeight(null);
if (outputHeight < 1) {
throw new IllegalArgumentException("output image height "
+ outputHeight + " is out of range");
}
// Get a buffered image from the image.
BufferedImage bi = new BufferedImage(outputWidth, outputHeight,
BufferedImage.TYPE_INT_RGB);
Graphics2D biContext = bi.createGraphics();
biContext.drawImage(outputImage, 0, 0, null);
// Note that additional drawing such as watermarks or logos can be placed here.
// com.sun.image.codec.jpeg package is included in sun and ibm sdk 1.3
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(outputStream);
// The default quality is 0.75.
JPEGEncodeParam jep = JPEGCodec.getDefaultJPEGEncodeParam(bi);
jep.setQuality(outputQuality, true);
encoder.encode(bi, jep);
// encoder.encode( bi );
outputStream.flush();
}// encodeImage
/** Adjusts the size of the image to the given coordinates.
* If width or height is -1, the image aspect ration is maintained.
* <p>;
* Hints are one of SCALE_DEFAULT, SCALE_FAST, SCALE_SMOOTH,
* SCALE_REPLICATE, SCALE_AREA_AVERAGING as defined in java.awt.Image.
*/
public Image setSize(Image image, int width, int height, int hints) {
return image.getScaledInstance(width, height, hints);
}
public Image setSize(Image image, int width, int height) {
return setSize(image, width, height, java.awt.Image.SCALE_DEFAULT); //setSize调用的是上一个方法.
}
// Component initialization
//a test!!
/*public static void main(String[] args) {
System.out.println("operating..........");
ScreenPicSaver sps = new ScreenPicSaver();
BufferedImage bufferedImage = null;
Image img = null;
String sdir = "d:\\";
String sfile = "Tom.BMP";
// bufferedImage =
// String sdir = new String("d:\\");
// String sfile = new String("desktop.bmp");
String outputFileName = new String("d:\\aaa.tif");
// Image inputImage = Toolkit.getDefaultToolkit().getImage(inputFileName);
// Image inputImage = sps.loadbitmap(sdir, sfile);
//===============================================================
// BufferedImage bufferedImage = null;
Robot robot;
// Image inputImage = null;
try {
robot = new Robot();
//得到桌面图像的bufferedImage对象
bufferedImage = robot.createScreenCapture(new Rectangle(Toolkit
.getDefaultToolkit().getScreenSize()));
} catch (Exception ex) {
ex.printStackTrace();
}
int width = bufferedImage.getWidth();
int height =bufferedImage.getHeight();
// 将bufferedImage对象转化位Image对象
img = bufferedImage.getScaledInstance(width, height,BufferedImage.TYPE_INT_RGB);
MediaTracker tracker = new MediaTracker(new Component() {
});
int outputWidth = bufferedImage.getWidth(); //使得新图像和原图像的宽度一样
float outputQuality = 0.80f;
Image outputImage = sps.setSize(img, outputWidth, -1); //-1表示在宽度确定的情况下，高度在原图像的基础上成比例缩放
try {
tracker.addImage(img, 0);
// sps.tracker.waitForAll();
tracker.waitForID(0);
tracker.checkAll(true);
} catch (InterruptedException e) {
e.printStackTrace();
}
int imageWidth = img.getWidth(null);
if (imageWidth < 1) {
throw new IllegalArgumentException("image width " + imageWidth
+ " is out of range");
}
int imageHeight = img.getHeight(null);
if (imageHeight < 1) {
throw new IllegalArgumentException("image height " + imageHeight
+ " is out of range");
}
try {
FileOutputStream fos = new FileOutputStream(outputFileName);
sps.encodeJPEG(fos, outputImage, outputQuality);
fos.flush();
fos.close();
} catch (Exception e) {
e.printStackTrace();
}
System.out.println("OK!!!");
System.exit(0);
}*/
public static void main(String[] args) throws IOException{
TransImg ti = new TransImg();
String sdir = "d:\\";
String sfile = "tom.bmp";
Image img = ti.loadbitmap(sdir,sfile);
ti.checkImage(img);
String outputFileName = new String("d:\\ccc.psd");
FileOutputStream fos = new FileOutputStream(outputFileName);
ti.encodeJPEG(fos,img,0.8f);
ti.setSize(img,img.getWidth(null),img.getHeight(null));
}
}
</code>;
如果谁知道又没有现成的package直接支持PSD,JPG,GIF，TIF格式的解析及编码，请告诉我，谢谢！ |
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发表于 2005-09-26 14:31
