Java CMYK转RGB源码网上很多，但是RGB转CMYK源码网上很少，那么多是只提供公式，要么提供依赖文件不全。这两天搜索很好久，终于找到一个可行方法。
项目使用maven搭建，依赖的工具包如下。在pom.xm文件添加该包依赖
<dependency> <groupId>javax.media.jai</groupId> <artifactId>com.springsource.javax.media.jai.codec</artifactId> <version>1.1.3</version> </dependency> package cn.soqi.mp.qihome.controller; import cn.soqi.mp.api.qihome.AjaxResult; import cn.soqi.mp.app.listener.AppContext; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.multipart.MultipartFile; import sun.misc.BASE64Decoder; import sun.misc.BASE64Encoder; import javax.imageio.ImageIO; import javax.media.jai.JAI; import javax.servlet.ServletContext; import javax.servlet.http.HttpServletRequest; import java.awt.color.ColorSpace; import java.awt.color.ICC_ColorSpace; import java.awt.color.ICC_Profile; import java.awt.image.BufferedImage; import java.awt.image.ColorConvertOp; import java.io.*; @Controller @RequestMapping("/mg/image") public class TestImageBinary { static BASE64Encoder encoder = new sun.misc.BASE64Encoder(); static BASE64Decoder decoder = new sun.misc.BASE64Decoder(); @RequestMapping("/page.html") public String intoUploadPage(){ return "/mg/management/rgb2cmyk"; } @RequestMapping("/upload.do") @ResponseBody public AjaxResult uploadOneImage(HttpServletRequest request,@RequestParam(required = false) String targetName,@RequestParam("pic") MultipartFile file) throws IOException{ AjaxResult result = new AjaxResult(); InputStream input = null ; OutputStream output = null ; if(file.isEmpty()==false){ input=file.getInputStream(); } //1 先将用户上传的文件保存到本地 String temFileName=mkFile(file.getOriginalFilename(),"original"); File saveFile = new File(temFileName); output = new FileOutputStream(saveFile) ; int temp = 0 ; byte data[] = new byte[512] ; while((temp=input.read(data,0,512))!=-1){ output.write(data) ; // 分块保存 } input.close() ; output.close() ; //end String targetFileName=null; if(targetName!=null&&!targetName.equals("")) { targetFileName = mkFile(targetName, "after_transfer"); } InputStream inputStream = new FileInputStream(saveFile); rgbToCmyk(inputStream, saveFile.getAbsolutePath(), targetFileName); result.setSuccess(true); result.setContent("上传成功并转码"); return result; } static String getImageBinary(String fileName){ File f = new File(fileName); BufferedImage bi; try { bi = ImageIO.read(f); String fileType=getFileType(fileName); ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); ImageIO.write(bi, fileType, outputStream); byte[] bytes = outputStream.toByteArray(); return encoder.encodeBuffer(bytes).trim(); } catch (IOException e) { e.printStackTrace(); } return null; } /** * 获取文件类型 * @param fileName 文件全名 * @return */ static String getFileType(String fileName){ return fileName.substring(fileName.lastIndexOf(".")+1,fileName.length()); } /** * 将其他格式的图片转换成CDR或其它文件格式 * @param sourceFileName 上传文件名 * @param newFileName 新文件名 */ static void base64StringToImage(String sourceFileName,String newFileName){ try { String base64String =getImageBinary(sourceFileName); byte[] bytes1 = decoder.decodeBuffer(base64String); ByteArrayInputStream inputStream = new ByteArrayInputStream(bytes1); BufferedImage bi1 =ImageIO.read(inputStream); File w2 = new File(newFileName);//可以是jpg,png,gif格式 ImageIO.write(bi1, getFileType(sourceFileName), w2); } catch (IOException e) { e.printStackTrace(); } } /** * 创建文件名 * @param fileName 文件名 * @param parentDir 可变参数，文件目录（在当前路径下新建目录） * @return 返回文件绝对路径 */ static String mkFile(String fileName,String...parentDir) throws IOException { StringBuffer absoluteFileName = getCurrentPath(); if(parentDir.length>0){ absoluteFileName.append(File.separator); absoluteFileName.append(parentDir[0]); File newDir=new File(absoluteFileName.toString()); if(!newDir.exists()){ newDir.mkdirs(); } } absoluteFileName.append(File.separator); absoluteFileName.append(fileName); String templateName=absoluteFileName.toString(); File file=new File(templateName); if(!file.exists()){ file.createNewFile(); } return absoluteFileName.toString(); } /** * 获取当前项目运行路径 * @return */ public static StringBuffer getCurrentPath(){ StringBuffer absoluteFileName = new StringBuffer(); ServletContext scontext = AppContext.getInstance().getContext(); absoluteFileName.append(scontext.getRealPath("/")); absoluteFileName.append("WEB-INF"); return absoluteFileName; } /** * 将rgb图片转化为cmyk图片 * @param fileName 文件名 * @param format 转化之后的文件格式(默认tif格式) * @throws IOException */ public static void rgbToCmyk(String fileName,String...format) throws IOException{ BufferedImage rgbImage = ImageIO.read(new File(fileName)); BufferedImage cmykImage = null; ColorSpace cpace = new ICC_ColorSpace(ICC_Profile.getInstance(TestImageBinary.class.getClassLoader().getResourceAsStream("common/ISOcoated_v2_300_eci.icc"))); ColorConvertOp op = new ColorConvertOp(rgbImage.getColorModel().getColorSpace(), cpace, null); cmykImage = op.filter(rgbImage, null); String newFileName=null; newFileName = fileName.substring(0, fileName.lastIndexOf(".")); if(format.length>0) { JAI.create("filestore", cmykImage, newFileName + format[0], format[0]); }else { JAI.create("filestore", cmykImage, newFileName + "tif", "TIFF"); } } /** * 将图片为rgb转化为cmyk * @param inputStream 图片输入流 * @param fileName 图片名词(绝对路径) * @param newFileName 图片保存路径（绝对路径）（如果没有参数，则生成的图片在当前目录下，且格式为tif） * @throws IOException */ public static void rgbToCmyk(InputStream inputStream,String fileName,String...newFileName) throws IOException{ BufferedImage rgbImage = ImageIO.read(inputStream); BufferedImage cmykImage = null; ColorSpace cpace = new ICC_ColorSpace(ICC_Profile.getInstance(TestImageBinary.class.getClassLoader().getResourceAsStream("ISOcoated_v2_300_eci.icc"))); ColorConvertOp op = new ColorConvertOp(rgbImage.getColorModel().getColorSpace(), cpace, null); cmykImage = op.filter(rgbImage, null); if(newFileName.length>0&&newFileName[0]!=null) { String targetFileName=fileName.substring(0,fileName.lastIndexOf(".")+1)+"tif"; JAI.create("filestore", cmykImage,targetFileName,"TIFF"); cmykImage.flush(); base64StringToImage(targetFileName,newFileName[0]);//转成对应格式 File file=new File(fileName); if(file.exists()) file.delete(); }else { String targetFileName=fileName.substring(0,fileName.lastIndexOf(".")+1)+"tif"; JAI.create("filestore", cmykImage, targetFileName, "TIFF"); } } }项目需要依赖ISOcoated_v2_300_eci.icc文件，ISOcoated_v2_300_eci.icc是一个工业的色彩标准文件。
