JIMI的学习

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java/j2se

Java SUN

网上有对他的简介很多，这不废话了，看看是怎么用，根据起自带的一些demo，简单说明下java对图片的处理

下载相应包（JimiProClasses.zip）并加到classpath，是个zip文件；
1.简单处理

java 代码

import com.sun.jimi.core.*;
import java.awt.Image;
public class JimiIsReallyEasy
{
public static void main(String[] args) throws JimiException
{
if (args.length < 2) {
System.err.println("Usage: JimiIsReallyEasy <source></source> <dest></dest>");
}
else {
Image image = Jimi.getImage(args[0]);
Jimi.putImage(image, args[1]);
System.exit(0);
}
}
}

这样处理的结果图片变小了，效果却还可以，肉眼感觉不出

============================================================================================================================================

2. ColorReduce对图片颜色的降低处理

1）先准备一张图片,方便测试，放在与java文件同目录下
2）写代码ColorReduceTest.java
这里主要用到com.sun.jimi.core.util.ColorReducer这个类，在起demo中有错误，多了个util，去了就可以了；

java 代码

import com.sun.jimi.core.*;//有相关的异常类，Jimi类，以及相应的JimiReader,JimiWriter
import com.sun.jimi.core.util.ColorReducer;
import java.awt.*;
public class ColorReduceTest
{
static Image image = null;
public static void main(String[] args) throws JimiException
{
if (args.length < 3) {
System.err.println("Usage: ColorReduceWithJimi <source></source> <dest></dest> <# colors>");
System.exit(1);
}
image = Jimi.getImage(args[0]);//装载图片
image = reduceColors(image, Integer.parseInt(args[2]), true);//核心处理
Jimi.putImage(image, args[1]);//保存图片
System.exit(0);
}
public static Image reduceColors(Image image, int colors, boolean dither)
{
ColorReducer reducer = new ColorReducer(colors, dither);//dither是慌乱，颤抖的意思
Image img = null;
try {
img = reducer.getColorReducedImage(image);
}
catch (JimiException e) {
System.out.println("Error color reducing/dithering");
}
return img;
}
}

////////////////////////////
ColorReducer 方法的介绍
2个构造方法
ColorReducer
public ColorReducer(int maxColors)Creates a ColorReducer to perform color reduction on an Image without any dithering.
Parameters:
maxColors - the maximum number of colors in the reduced image
--------------------------------------------------------------------------------
ColorReducer
public ColorReducer(int maxColors,
boolean dither)Creates a ColorReducer to perform color reduction on an Image.
Parameters:
maxColors - the maximum number of colors in the reduced image
dither - true if the image should be dithered to create smoother results

其他方法
getColorReducedImageProducer
public java.awt.image.ImageProducer getColorReducedImageProducer(java.awt.image.ImageProducer producer)
                                                          throws JimiException
Perform color reduction.
Parameters:
producer - the ImageProducer to draw image data from
--------------------------------------------------------------------------------
getColorReducedImageProducer
public java.awt.image.ImageProducer getColorReducedImageProducer(java.awt.Image image)
                                                          throws JimiException
Perform color reduction.
Parameters:
image - the Image to draw image data from
-------------------------------------------------------------------------------
getColorReducedImage
public java.awt.Image getColorReducedImage(java.awt.image.ImageProducer producer)
                                    throws JimiException
Perform color reduction.
Parameters:
producer - the ImageProducer to draw image data from
--------------------------------------------------------------------------------
getColorReducedImage
public java.awt.Image getColorReducedImage(java.awt.Image image)
                                    throws JimiException
Perform color reduction.
Parameters:
image - the Image to draw image data from
--------------------------------------------------------------------------------
doColorReduction
protected JimiRasterImage doColorReduction(java.awt.image.ImageProducer producer)
                                    throws JimiException

#完#
---------------------------------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------------------------------

二、
把gif图片处理成png

1.准备图片
2.编写代码

java 代码

import com.sun.jimi.core.Jimi;
import com.sun.jimi.core.JimiException;
import com.sun.jimi.core.JimiWriter;
import com.sun.jimi.core.options.PNGOptions;//注意这里，转成其他格式也可以
import java.awt.image.ImageProducer;
/**
* Simple class for saving PNG files with or without compression
* as a demonstration of format-specific option usage.
*/
public class CustomOption
{
public static void main(String[] args)
{
if (args.length < 3) {
System.err.println("Convert a file to PNG with compression on or off.");
System.err.println("Usage: CustomOption <source></source> <dest></dest> ");
System.exit(1);
}
String source = args[0];
String dest = args[1];
String compression = args[2];//压缩情况
// only handle PNG files
// 如果存为非png的格式，则自动加png格式结尾
if (!dest.endsWith("png")) {
dest += ".png";
System.out.println("Overriding to PNG, output file: " + dest);
}
try {
PNGOptions options = new PNGOptions();
if (compression.equals("max")) { //对压缩情况处理
options.setCompressionType(PNGOptions.COMPRESSION_MAX);
}
else if (compression.equals("none")) {
options.setCompressionType(PNGOptions.COMPRESSION_NONE);
}
else {
options.setCompressionType(PNGOptions.COMPRESSION_DEFAULT);
}
ImageProducer image = Jimi.getImageProducer(args[0]); //Get an ImageProducer for an image.
JimiWriter writer = Jimi.createJimiWriter(dest); // Create a JimiWriter to control encoding of an image writer.setSource(image); //Set the source image to be written.
writer.setOptions(options); //Set the options to use for encoding.
writer.putImage(dest); //Write the source to a file.
}
catch (JimiException je) {
System.err.println("Error: " + je);
}
}
}

经过max压缩，文件缩小了些，清晰度却肉眼没有感觉到变化
更多说明请看api
=============================================================================================================================================

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