When you want to do a library project, the picture size, pixel control is the first problem to be solved.
One, the single graph produces slightly shrinks the graph
Dantu is redrawn to generate a new picture. The new diagram can be reduced by a certain percentage from the old picture, or it can be defined as a fixed size.
The detailed code is as follows:
Copy Code code as follows:
<span style= "font-size:14px" >import com.sun.image.codec.jpeg.JPEGImageEncoder;
Import Com.sun.image.codec.jpeg.JPEGCodec;
Import Com.sun.image.codec.jpeg.JPEGEncodeParam;
Import Javax.imageio.ImageIO;
Import Java.awt.image.BufferedImage;
Import Java.util.HashMap;
Import java.util.List;
Import java.util.ArrayList;
Import Java.io.File;
Import java.io.IOException;
Import Java.io.FileOutputStream;
Import Java.util.Map;
public class Picchange {
/**
* @param im RAW image
* @param resizetimes need to reduce the number of multiples, twice times the original 1/2, the larger the value, the smaller the return of the picture
* @return return the processed image
*/
Public BufferedImage resizeimage (BufferedImage im, float resizetimes) {
/* The width and height of the original image * *
int width = im.getwidth ();
int height = im.getheight ();
/* The width and height of the adjusted picture * *
int towidth = (int) (Float.parsefloat (string.valueof (width))/resizetimes);
int toheight = (int) (Float.parsefloat (string.valueof (height))/resizetimes);
/* New Generated results picture * *
BufferedImage result = new BufferedImage (Towidth, Toheight, Bufferedimage.type_int_rgb);
Result.getgraphics (). DrawImage (Im.getscaledinstance (Towidth, Toheight, Java.awt.Image.SCALE_SMOOTH), 0, 0, NULL);
return result;
}
/**
* @param im RAW image
* @param resizetimes multiples, such as 0.5 is reduced by half, 0.98, etc. double type
* @return return the processed image
*/
Public BufferedImage zoomimage (BufferedImage im, float resizetimes) {
/* The width and height of the original image * *
int width = im.getwidth ();
int height = im.getheight ();
/* The width and height of the adjusted picture * *
int towidth = (int) (Float.parsefloat (string.valueof (width)) * resizetimes);
int toheight = (int) (Float.parsefloat (string.valueof (height)) * resizetimes);
/* New Generated results picture * *
BufferedImage result = new BufferedImage (Towidth, Toheight, Bufferedimage.type_int_rgb);
Result.getgraphics (). DrawImage (Im.getscaledinstance (Towidth, Toheight, Java.awt.Image.SCALE_SMOOTH), 0, 0, NULL);
return result;
}
public boolean writehighquality (BufferedImage im, String filefullpath) {
try {
/* Output to file stream * *
FileOutputStream newimage = new FileOutputStream (Filefullpath+system.currenttimemillis () + ". jpg");
JPEGImageEncoder encoder = Jpegcodec.createjpegencoder (newimage);
JPEGEncodeParam Jep = Jpegcodec.getdefaultjpegencodeparam (IM);
/* Compression Quality * *
Jep.setquality (1f, true);
Encoder.encode (IM, Jep);
/* Near JPEG coding * *
Newimage.close ();
return true;
catch (Exception e) {
return false;
}
}
public static void Main (string[] args) throws exception{
String Inputfoler = "F:\\pic";
/* Here fill in your folder to reduce the picture of the full address * *
String OutputFolder = "f:\\picnew\\";
* * Here to fill in your converted pictures stored folder/
float times = 0.25f;
/* This parameter is to be converted to a multiple, if it is 1 is converted to 1 time times * *
Picchange r = new Picchange ();
File FF = new file ("F:\\pic\\chrysanthemum1.jpg");
BufferedImage f = javax.imageio.ImageIO.read (FF);
R.writehighquality (R.zoomimage (f,times), OutputFolder);
}
}</span>
When you move the above code to MyEclipse, you may have an error introducing the toolkit.
Copy Code code as follows:
<span style= "font-size:14px" >import com.sun.image.codec.</span>
workaround: Just put the forbidden reference in the deprecated and restricted APIs inside the Windows-preferences-java-compiler-errors/warnings s (access rules) is selected as warning and can be compiled.
Second, batch generation of slightly reduced image
Batch generation thumbnail to convert files in a known folder to. jpg or other picture suffixes and put them in a separate folder
Copy Code code as follows:
<span style= "font-size:14px" >import com.sun.image.codec.jpeg.JPEGImageEncoder;
Import Com.sun.image.codec.jpeg.JPEGCodec;
Import Com.sun.image.codec.jpeg.JPEGEncodeParam;
Import Javax.imageio.ImageIO;
Import Java.awt.image.BufferedImage;
Import Java.util.HashMap;
Import java.util.List;
Import java.util.ArrayList;
Import Java.io.File;
Import java.io.IOException;
Import Java.io.FileOutputStream;
Import Java.util.Map;
public class Resizeimage {
/**
* @param im RAW image
* @param resizetimes need to reduce the number of multiples, twice times the original 1/2, the larger the value, the smaller the return of the picture
* @return return the processed image
*/
Public BufferedImage resizeimage (BufferedImage im, float resizetimes) {
/* The width and height of the original image * *
int width = im.getwidth ();
int height = im.getheight ();
/* The width and height of the adjusted picture * *
int towidth = (int) (Float.parsefloat (string.valueof (width))/resizetimes);
int toheight = (int) (Float.parsefloat (string.valueof (height))/resizetimes);
/* New Generated results picture * *
BufferedImage result = new BufferedImage (Towidth, Toheight, Bufferedimage.type_int_rgb);
Result.getgraphics (). DrawImage (Im.getscaledinstance (Towidth, Toheight, Java.awt.Image.SCALE_SMOOTH), 0, 0, NULL);
return result;
}
/**
* @param im RAW image
* @param resizetimes multiples, such as 0.5 is reduced by half, 0.98, etc. double type
* @return return the processed image
*/
Public BufferedImage zoomimage (BufferedImage im, float resizetimes) {
/* The width and height of the original image * *
int width = im.getwidth ();
int height = im.getheight ();
/* The width and height of the adjusted picture * *
int towidth = (int) (Float.parsefloat (string.valueof (width)) * resizetimes);
int toheight = (int) (Float.parsefloat (string.valueof (height)) * resizetimes);
/* New Generated results picture * *
BufferedImage result = new BufferedImage (Towidth, Toheight, Bufferedimage.type_int_rgb);
Result.getgraphics (). DrawImage (Im.getscaledinstance (Towidth, Toheight, Java.awt.Image.SCALE_SMOOTH), 0, 0, NULL);
return result;
}
/**
* @param the folder where you want to convert the image, the folder path where the image is stored
* @param an array of the suffix names of the type pictures
* @return
*/
Public list<bufferedimage> getimagelist (String path, string[] type) throws ioexception{
map<string,boolean> map = new hashmap<string, boolean> ();
for (String S:type) {
Map.put (s,true);
}
list<bufferedimage> result = new arraylist<bufferedimage> ();
file[] filelist = new File (path). Listfiles ();
for (File f:filelist) {
if (f.length () = = 0)
Continue
if (Map.get (GetExtension (f.getname)) = = null)
Continue
Result.add (Javax.imageio.ImageIO.read (f));
}
return result;
}
/**
* Write the picture to the disk
* @param im
* @param the folder address written by the path eg:c://home//picture
* @param fileName Dcm1987.jpg Write the name of the picture
* @return
*/
public boolean Writetodisk (BufferedImage im, string path, string fileName) {
File F = new file (path + fileName);
String FileType = getextension (fileName);
if (FileType = null)
return false;
try {
Imageio.write (IM, fileType, f);
Im.flush ();
return true;
catch (IOException e) {
return false;
}
}
public boolean writehighquality (BufferedImage im, String filefullpath) {
try {
/* Output to file stream * *
FileOutputStream newimage = new FileOutputStream (Filefullpath+system.currenttimemillis () + ". jpg");
JPEGImageEncoder encoder = Jpegcodec.createjpegencoder (newimage);
JPEGEncodeParam Jep = Jpegcodec.getdefaultjpegencodeparam (IM);
/* Compression Quality * *
Jep.setquality (1f, true);
Encoder.encode (IM, Jep);
/* Near JPEG coding * *
Newimage.close ();
return true;
catch (Exception e) {
return false;
}
}
/**
* Returns the file suffix name of the file
* @param fileName
* @return
*/
public string GetExtension (string fileName) {
try {
return Filename.split ("\.") [Filename.split ("\."). LENGTH-1];
catch (Exception e) {
return null;
}
}
public static void Main (string[] args) throws exception{
String Inputfoler = "F:\\pic";
/* Here fill in your folder to reduce the picture of the full address * *
String OutputFolder = "f:\\picnew\\";
* * Here to fill in your converted pictures stored folder/
float times = 0.25f;
/* This parameter is to be converted to a multiple, if it is 1 is converted to 1 time times * *
Resizeimage r = new Resizeimage ();
list<bufferedimage> imageList = r.getimagelist (inputfoler,new string[] {"JPG"});
for (BufferedImage i:imagelist) {
R.writehighquality (R.zoomimage (i,times), OutputFolder);
}
}
}</span>
