我唯一擔心使用BufferedImage對象的原因是,對於非常大的圖像60000x32000,它將導致JVM在有限的JVM堆空間上使用OOM關閉。然而,ImageIO.read方法的JavaDocs說了一些關於「控制緩存」的內容。ImageIO中控制緩存意味着什麼
什麼是控制緩存在這種情況下?
這是否意味着ImageIO.read使用磁盤上的圖像緩存大圖像?
參考的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;
}
我認爲@ john16384可以非常準確地回答你的問題。但是,如果您喜歡使用磁盤緩存映像來避免OOME,則可以嘗試我的['MappedImageFactory'](https://github.com/haraldk/TwelveMonkeys/blob/master/sandbox/sandbox-common/src/main/的java/COM/twelvemonkeys /圖像/ MappedImageFactory.java)。通過使用'ImageReadParam.setDestination(mappedImage)',你可以將'ImageIO'直接讀入這些圖像。 – haraldK
這也適用於CMYK色彩空間系列嗎? – t6nand
我相信是的。但我沒有嘗試過,並且像往常一樣代碼沒有保修。什麼讓你相信它不會工作? – haraldK