Java判断图片是grb还是cmyk

public static boolean isRgbOrCmyk(String filename) throws IOException {
File file = new File(filename);
boolean isRgb=true;//true是Rgb否则是Cmyk
//创建输入流
ImageInputStream input = ImageIO.createImageInputStream(file);
Iterator readers = ImageIO.getImageReaders(input);
if (readers == null || !readers.hasNext()) {
throw new RuntimeException("No ImageReaders found");
}
ImageReader reader = (ImageReader) readers.next();
reader.setInput(input);
//获取文件格式
BufferedImage image;
try {
// 尝试读取图片 (包括颜色的转换).
reader.read(0); // RGB
isRgb=true;
} catch (IIOException e) {
// 读取Raster (没有颜色的转换).
reader.readRaster(0, null);// CMYK
isRgb=false;
}
return  isRgb;
}