Java Api 高效地生成等比例縮略圖 關於cmyk模式圖片問題的解決
import java.awt.image.BufferedImage;
import java.awt.image.Raster;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;
import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;
import com.kingdee.youshang.ValidateException;
//生成等比例高質量縮略圖
public class ScaleImageUtil {
private int width;
private int height;
private int scaleWidth;
private double support = (double) 0.75;
private double PI = (double) 3.14159265358978;
private double[] contrib;
private double[] normContrib;
private double[] tmpContrib;
private int nDots;
private int nHalfDots;
public static ScaleImageUtil getInstance() {
return new ScaleImageUtil();
}
/** *//**
* Start: Use Lanczos filter to replace the original algorithm for image
* scaling. Lanczos improves quality of the scaled image modify by :blade
*/
public static void main(String[] args) {
ScaleImageUtil is = new ScaleImageUtil();
try {
long time = System.currentTimeMillis();
is.saveImageAsJpg("d:/p-15a.jpg", "d:/p-15a222222222222.jpg", 1024, 768);
// is.saveImageAsJpg("d:/DSC_0693.jpg", "d:/DSC_06932222222.jpg", 1024, 768);
// is.saveImageAsJpg("d:/20160510170956.png", "d:/201605101709562222322.png", 1024, 768);
// is.saveImageAsJpg(new FileInputStream("d:/DSC_0693.jpg"), "d:/liu999-1.png", 1024, 768);
// is.saveImageAsJpg(new FileInputStream("d:/liu999-1.png"), "d:/liu999-2.png", 120, 120);
// is.saveImageAsJpg(new FileInputStream("d:/liu999-1.png"), "d:/liu999-3.png", 60, 60);
System.out.println((System.currentTimeMillis() - time));
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
// fromFileStr原圖片地址,saveToFileStr生成縮略圖地址,formatWideth生成圖片寬度,formatHeight高度
public void saveImageAsJpg(String fromFileStr, String saveToFileStr,
int formatWideth, int formatHeight) throws Exception {
BufferedImage srcImage;
File saveFile = new File(saveToFileStr);
File parent = saveFile.getParentFile();
if (!parent.exists()) {
parent.mkdirs();
}
File fromFile = new File(fromFileStr);
// srcImage = javax.imageio.ImageIO.read(fromFile); // construct image
srcImage = readImage(new FileInputStream(fromFile)); // construct image new by liul20161121
int imageWideth = srcImage.getWidth(null);
int imageHeight = srcImage.getHeight(null);
int changeToWideth = 0;
int changeToHeight = 0;
if (imageWideth > 0 && imageHeight > 0) {
// flag=true;
if (imageWideth / imageHeight >= formatWideth / formatHeight) {
if (imageWideth > formatWideth) {
changeToWideth = formatWideth;
changeToHeight = (imageHeight * formatWideth) / imageWideth;
} else {
changeToWideth = imageWideth;
changeToHeight = imageHeight;
}
} else {
if (imageHeight > formatHeight) {
changeToHeight = formatHeight;
changeToWideth = (imageWideth * formatHeight) / imageHeight;
} else {
changeToWideth = imageWideth;
changeToHeight = imageHeight;
}
}
}
srcImage = imageZoomOut(srcImage, changeToWideth, changeToHeight);
ImageIO.write(srcImage, "JPEG", saveFile);
// ImageIO.write(srcImage, "PNG", saveFile);
// FileOutputStream out = null;
// try {
// out = new FileOutputStream(saveFile);
// JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
//// JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(srcImage);
//// int quality = Math.max(0, Math.min(90, 100));
//// param.setQuality((float) quality / 100.0f, false);
//// encoder.setJPEGEncodeParam(param);
// encoder.encode(srcImage);
// } catch (Exception e) {
// e.printStackTrace();
// throw new Exception(e);
// } finally {
// if (out != null) {
// out.close();
// }
// }
}
// fromFileStr原圖片地址,saveToFileStr生成縮略圖地址,formatWideth生成圖片寬度,formatHeight高度
public void saveImageAsJpg(InputStream inputStream, String saveToFileStr,
int formatWideth, int formatHeight) throws Exception {
try {
File saveFile = new File(saveToFileStr);
File parent = saveFile.getParentFile();
if (!parent.exists()) {
parent.mkdirs();
}
// BufferedImage srcImage = javax.imageio.ImageIO.read(inputStream); // construct image
BufferedImage srcImage = readImage(inputStream); // construct image new update by liul20161121
if (srcImage == null) {
throw new ValidateException("此文件可能已損壞、損毀！");
}
int imageWideth = srcImage.getWidth(null);
int imageHeight = srcImage.getHeight(null);
int changeToWideth = 0;
int changeToHeight = 0;
if (imageWideth > 0 && imageHeight > 0) {
// flag=true;
if (imageWideth / imageHeight >= formatWideth / formatHeight) {
if (imageWideth > formatWideth) {
changeToWideth = formatWideth;
changeToHeight = (imageHeight * formatWideth) / imageWideth;
} else {
changeToWideth = imageWideth;
changeToHeight = imageHeight;
}
} else {
if (imageHeight > formatHeight) {
changeToHeight = formatHeight;
changeToWideth = (imageWideth * formatHeight) / imageHeight;
} else {
changeToWideth = imageWideth;
changeToHeight = imageHeight;
}
}
}
srcImage = imageZoomOut(srcImage, changeToWideth, changeToHeight);
ImageIO.write(srcImage, "JPEG", saveFile);
} catch (Exception e) {
throw e;
} finally {
if (inputStream != null) {
try {
inputStream.close();
} catch (Exception e) {
throw e;
}
}
}
// ImageIO.write(srcImage, "PNG", saveFile);
// FileOutputStream out = null;
// try {
// out = new FileOutputStream(saveFile);
// JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
//// JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(srcImage);
//// int quality = Math.max(0, Math.min(90, 100));
//// param.setQuality((float) quality / 100.0f, false);
//// encoder.setJPEGEncodeParam(param);
// encoder.encode(srcImage);
// } catch (Exception e) {
// e.printStackTrace();
// throw new Exception(e);
// } finally {
// if (out != null) {
// out.close();
// }
// }
}
// fromFileStr原圖片地址,saveToFileStr生成縮略圖地址,formatWideth生成圖片寬度,formatHeight高度
public ByteArrayOutputStream saveImageAsJpg(InputStream inputStream,
int formatWideth, int formatHeight) throws Exception {
try {
ByteArrayOutputStream out = new ByteArrayOutputStream();
// BufferedImage srcImage = javax.imageio.ImageIO.read(inputStream); // construct image
BufferedImage srcImage = readImage(inputStream); // construct image new update by liul20161121
if (srcImage == null) {
throw new ValidateException("此文件可能已損壞、損毀！");
}
int imageWideth = srcImage.getWidth(null);
int imageHeight = srcImage.getHeight(null);
int changeToWideth = 0;
int changeToHeight = 0;
if (imageWideth > 0 && imageHeight > 0) {
// flag=true;
if (imageWideth / imageHeight >= formatWideth / formatHeight) {
if (imageWideth > formatWideth) {
changeToWideth = formatWideth;
changeToHeight = (imageHeight * formatWideth) / imageWideth;
} else {
changeToWideth = imageWideth;
changeToHeight = imageHeight;
}
} else {
if (imageHeight > formatHeight) {
changeToHeight = formatHeight;
changeToWideth = (imageWideth * formatHeight) / imageHeight;
} else {
changeToWideth = imageWideth;
changeToHeight = imageHeight;
}
}
}
srcImage = imageZoomOut(srcImage, changeToWideth, changeToHeight);
ImageIO.write(srcImage, "JPEG", out);
return out;
} catch (Exception e) {
throw e;
} finally {
if (inputStream != null) {
try {
inputStream.close();
} catch (Exception e) {
throw e;
}
}
}
// ImageIO.write(srcImage, "PNG", saveFile);
// FileOutputStream out = null;
// try {
// out = new FileOutputStream(saveFile);
// JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
//// JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(srcImage);
//// int quality = Math.max(0, Math.min(90, 100));
//// param.setQuality((float) quality / 100.0f, false);
//// encoder.setJPEGEncodeParam(param);
// encoder.encode(srcImage);
// } catch (Exception e) {
// e.printStackTrace();
// throw new Exception(e);
// } finally {
// if (out != null) {
// out.close();
// }
// }
}
public BufferedImage imageZoomOut(BufferedImage srcBufferImage, int w, int h) {
width = srcBufferImage.getWidth();
height = srcBufferImage.getHeight();
scaleWidth = w;
if (DetermineResultSize(w, h) == 1) {
return srcBufferImage;
}
CalContrib();
BufferedImage pbOut = HorizontalFiltering(srcBufferImage, w);
BufferedImage pbFinalOut = VerticalFiltering(pbOut, h);
return pbFinalOut;
}
/** *//**
* 決定圖像尺寸
*/
private int DetermineResultSize(int w, int h) {
double scaleH, scaleV;
scaleH = (double) w / (double) width;
scaleV = (double) h / (double) height;
// 須要判斷一下scaleH，scaleV，不作放大操做
if (scaleH > 1.0 && scaleV > 1.0) {
return 1;
}
return 0;
} // end of DetermineResultSize()
private double Lanczos(int i, int inWidth, int outWidth, double Support) {
double x;
x = (double) i * (double) outWidth / (double) inWidth;
return Math.sin(x * PI) / (x * PI) * Math.sin(x * PI / Support)
/ (x * PI / Support);
}
private void CalContrib() {
nHalfDots = (int) ((double) width * support / (double) scaleWidth);
nDots = nHalfDots * 2 + 1;
try {
contrib = new double[nDots];
normContrib = new double[nDots];
tmpContrib = new double[nDots];
} catch (Exception e) {
System.out.println("init contrib,normContrib,tmpContrib" + e);
}
int center = nHalfDots;
contrib[center] = 1.0;
double weight = 0.0;
int i = 0;
for (i = 1; i <= center; i++) {
contrib[center + i] = Lanczos(i, width, scaleWidth, support);
weight += contrib[center + i];
}
for (i = center - 1; i >= 0; i--) {
contrib[i] = contrib[center * 2 - i];
}
weight = weight * 2 + 1.0;
for (i = 0; i <= center; i++) {
normContrib[i] = contrib[i] / weight;
}
for (i = center + 1; i < nDots; i++) {
normContrib[i] = normContrib[center * 2 - i];
}
} // end of CalContrib()
// 處理邊緣
private void CalTempContrib(int start, int stop) {
double weight = 0;
int i = 0;
for (i = start; i <= stop; i++) {
weight += contrib[i];
}
for (i = start; i <= stop; i++) {
tmpContrib[i] = contrib[i] / weight;
}
} // end of CalTempContrib()
private int GetRedValue(int rgbValue) {
int temp = rgbValue & 0x00ff0000;
return temp >> 16;
}
private int GetGreenValue(int rgbValue) {
int temp = rgbValue & 0x0000ff00;
return temp >> 8;
}
private int GetBlueValue(int rgbValue) {
return rgbValue & 0x000000ff;
}
private int ComRGB(int redValue, int greenValue, int blueValue) {
return (redValue << 16) + (greenValue << 8) + blueValue;
}
// 行水平濾波
private int HorizontalFilter(BufferedImage bufImg, int startX, int stopX,
int start, int stop, int y, double[] pContrib) {
double valueRed = 0.0;
double valueGreen = 0.0;
double valueBlue = 0.0;
int valueRGB = 0;
int i, j;
for (i = startX, j = start; i <= stopX; i++, j++) {
valueRGB = bufImg.getRGB(i, y);
valueRed += GetRedValue(valueRGB) * pContrib[j];
valueGreen += GetGreenValue(valueRGB) * pContrib[j];
valueBlue += GetBlueValue(valueRGB) * pContrib[j];
}
valueRGB = ComRGB(Clip((int) valueRed), Clip((int) valueGreen),
Clip((int) valueBlue));
return valueRGB;
} // end of HorizontalFilter()
// 圖片水平濾波
private BufferedImage HorizontalFiltering(BufferedImage bufImage, int iOutW) {
int dwInW = bufImage.getWidth();
int dwInH = bufImage.getHeight();
int value = 0;
BufferedImage pbOut = new BufferedImage(iOutW, dwInH,
BufferedImage.TYPE_INT_RGB);
for (int x = 0; x < iOutW; x++) {
int startX;
int start;
int X = (int) (((double) x) * ((double) dwInW) / ((double) iOutW) + 0.5);
int y = 0;
startX = X - nHalfDots;
if (startX < 0) {
startX = 0;
start = nHalfDots - X;
} else {
start = 0;
}
int stop;
int stopX = X + nHalfDots;
if (stopX > (dwInW - 1)) {
stopX = dwInW - 1;
stop = nHalfDots + (dwInW - 1 - X);
} else {
stop = nHalfDots * 2;
}
if (start > 0 || stop < nDots - 1) {
CalTempContrib(start, stop);
for (y = 0; y < dwInH; y++) {
value = HorizontalFilter(bufImage, startX, stopX, start,
stop, y, tmpContrib);
pbOut.setRGB(x, y, value);
}
} else {
for (y = 0; y < dwInH; y++) {
value = HorizontalFilter(bufImage, startX, stopX, start,
stop, y, normContrib);
pbOut.setRGB(x, y, value);
}
}
}
return pbOut;
} // end of HorizontalFiltering()
private int VerticalFilter(BufferedImage pbInImage, int startY, int stopY,
int start, int stop, int x, double[] pContrib) {
double valueRed = 0.0;
double valueGreen = 0.0;
double valueBlue = 0.0;
int valueRGB = 0;
int i, j;
for (i = startY, j = start; i <= stopY; i++, j++) {
valueRGB = pbInImage.getRGB(x, i);
valueRed += GetRedValue(valueRGB) * pContrib[j];
valueGreen += GetGreenValue(valueRGB) * pContrib[j];
valueBlue += GetBlueValue(valueRGB) * pContrib[j];
// System.out.println(valueRed+"->"+Clip((int)valueRed)+"<-");
//
// System.out.println(valueGreen+"->"+Clip((int)valueGreen)+"<-");
// System.out.println(valueBlue+"->"+Clip((int)valueBlue)+"<-"+"-->");
}
valueRGB = ComRGB(Clip((int) valueRed), Clip((int) valueGreen),
Clip((int) valueBlue));
// System.out.println(valueRGB);
return valueRGB;
} // end of VerticalFilter()
private BufferedImage VerticalFiltering(BufferedImage pbImage, int iOutH) {
int iW = pbImage.getWidth();
int iH = pbImage.getHeight();
int value = 0;
BufferedImage pbOut = new BufferedImage(iW, iOutH,
BufferedImage.TYPE_INT_RGB);
for (int y = 0; y < iOutH; y++) {
int startY;
int start;
int Y = (int) (((double) y) * ((double) iH) / ((double) iOutH) + 0.5);
startY = Y - nHalfDots;
if (startY < 0) {
startY = 0;
start = nHalfDots - Y;
} else {
start = 0;
}
int stop;
int stopY = Y + nHalfDots;
if (stopY > (int) (iH - 1)) {
stopY = iH - 1;
stop = nHalfDots + (iH - 1 - Y);
} else {
stop = nHalfDots * 2;
}
if (start > 0 || stop < nDots - 1) {
CalTempContrib(start, stop);
for (int x = 0; x < iW; x++) {
value = VerticalFilter(pbImage, startY, stopY, start, stop,
x, tmpContrib);
pbOut.setRGB(x, y, value);
}
} else {
for (int x = 0; x < iW; x++) {
value = VerticalFilter(pbImage, startY, stopY, start, stop,
x, normContrib);
pbOut.setRGB(x, y, value);
}
}
}
return pbOut;
} // end of VerticalFiltering()
int Clip(int x) {
if (x < 0)
return 0;
if (x > 255)
return 255;
return x;
}
private BufferedImage readImage(InputStream stream) throws IOException {
ImageInputStream iis = ImageIO.createImageInputStream(stream);
Iterator<ImageReader> imageReaders = ImageIO.getImageReaders(iis);
ImageReader imageReader = imageReaders.next();
imageReader.setInput(iis, true, true);
String format = imageReader.getFormatName();
BufferedImage result = null;
if ("JPEG".equalsIgnoreCase(format) || "JPG".equalsIgnoreCase(format)) {
Raster raster = imageReader.readRaster(0, null);
int w = raster.getWidth();
int h = raster.getHeight();
result = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
int rgb[] = new int[3];
int pixel[] = new int[3];
for (int x = 0; x < w; x++) {
for (int y = 0; y < h; y++) {
raster.getPixel(x, y, pixel);
int Y = pixel[0];
int CR = pixel[1];
int CB = pixel[2];
toRGB(Y, CB, CR, rgb);
int r = rgb[0];
int g = rgb[1];
int b = rgb[2];
int bgr = ((b & 0xFF) << 16) | ((g & 0xFF) << 8)
| (r & 0xFF);
result.setRGB(x, y, bgr);
}
}
}else{
result = imageReader.read(0);
}
return result;
}
// Based on http://www.equasys.de/colorconversion.html
private void toRGB(int y, int cb, int cr, int rgb[]) {
float Y = y / 255.0f;
float Cb = (cb - 128) / 255.0f;
float Cr = (cr - 128) / 255.0f;
float R = Y + 1.4f * Cr;
float G = Y - 0.343f * Cb - 0.711f * Cr;
float B = Y + 1.765f * Cb;
R = Math.min(1.0f, Math.max(0.0f, R));
G = Math.min(1.0f, Math.max(0.0f, G));
B = Math.min(1.0f, Math.max(0.0f, B));
int r = (int) (R * 255);
int g = (int) (G * 255);
int b = (int) (B * 255);
rgb[0] = r;
rgb[1] = g;
rgb[2] = b;
}
}
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