我唯一担心使用BufferedImage对象的原因是,对于非常大的图像60000x32000,它将导致JVM在有限的JVM堆空间上使用OOM关闭。然而,ImageIO.read方法的JavaDocs说了一些关于“控制缓存”的内容。ImageIO中控制缓存意味着什么
什么是控制缓存在这种情况下?
这是否意味着ImageIO.read使用磁盘上的图像缓存大图像?
参考的JavaDoc和下面ImageIO.read方法:
/**
* Returns a <code>BufferedImage</code> as the result of decoding
* a supplied <code>File</code> with an <code>ImageReader</code>
* chosen automatically from among those currently registered.
* The <code>File</code> is wrapped in an
* <code>ImageInputStream</code>. If no registered
* <code>ImageReader</code> claims to be able to read the
* resulting stream, <code>null</code> is returned.
*
* <p> The current cache settings from <code>getUseCache</code>and
* <code>getCacheDirectory</code> will be used to control caching in the
* <code>ImageInputStream</code> that is created.
*
* <p> Note that there is no <code>read</code> method that takes a
* filename as a <code>String</code>; use this method instead after
* creating a <code>File</code> from the filename.
*
* <p> This method does not attempt to locate
* <code>ImageReader</code>s that can read directly from a
* <code>File</code>; that may be accomplished using
* <code>IIORegistry</code> and <code>ImageReaderSpi</code>.
*
* @param input a <code>File</code> to read from.
*
* @return a <code>BufferedImage</code> containing the decoded
* contents of the input, or <code>null</code>.
*
* @exception IllegalArgumentException if <code>input</code> is
* <code>null</code>.
* @exception IOException if an error occurs during reading.
*/
public static BufferedImage read(File input) throws IOException {
if (input == null) {
throw new IllegalArgumentException("input == null!");
}
if (!input.canRead()) {
throw new IIOException("Can't read input file!");
}
ImageInputStream stream = createImageInputStream(input);
if (stream == null) {
throw new IIOException("Can't create an ImageInputStream!");
}
BufferedImage bi = read(stream);
if (bi == null) {
stream.close();
}
return bi;
}
我认为@ john16384可以非常准确地回答你的问题。但是,如果您喜欢使用磁盘缓存映像来避免OOME,则可以尝试我的['MappedImageFactory'](https://github.com/haraldk/TwelveMonkeys/blob/master/sandbox/sandbox-common/src/main/的java/COM/twelvemonkeys /图像/ MappedImageFactory.java)。通过使用'ImageReadParam.setDestination(mappedImage)',你可以将'ImageIO'直接读入这些图像。 – haraldK
这也适用于CMYK色彩空间系列吗? – t6nand
我相信是的。但我没有尝试过,并且像往常一样代码没有保修。什么让你相信它不会工作? – haraldK