5
我有一個tiff文件，尺寸爲18000 * 18000，尺寸爲1.20 GB。 tiff有72 DPI。如何將巨大的TIFF圖像轉換爲PNG/JPEG而不會出現內存不足錯誤？
我想使用400 DPI將此TIFF轉換爲PNG/JPEG。
我使用以下代碼來做到這一點
public static void ConvertTiffToJpg(String str_TiffUrl,
String str_JpgFileDestinationUrl) throws Exception {
try {
FileSeekableStream obj_FileSeekableStream = new FileSeekableStream(
new File(str_TiffUrl));
ImageDecoder obj_ImageDecoder = ImageCodec.createImageDecoder(
"tiff", obj_FileSeekableStream, null);
RenderedImage obj_RenderedImage = obj_ImageDecoder
.decodeAsRenderedImage();
JAI.create("filestore", obj_RenderedImage,
str_JpgFileDestinationUrl, "jpeg");
obj_RenderedImage = null;
obj_ImageDecoder = null;
obj_FileSeekableStream.close();
} catch (Exception ex) {
throw ex;
}
上面的代碼完全適用於更小的圖像，然後例如TIFF圖像小於5000在尺寸* 5000可以很容易地轉換爲JPEG/PNG指定的圖像[雖然我需要改變的PNG編碼器]，
但是當我嘗試運行相同的代碼上面提到的文件時，它拋出以下異常
Error: One factory fails for the operation "encode"
Occurs in: javax.media.jai.ThreadSafeOperationRegistry
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at javax.media.jai.FactoryCache.invoke(FactoryCache.java:122)
at javax.media.jai.OperationRegistry.invokeFactory(OperationRegistry.java:1674)
at javax.media.jai.ThreadSafeOperationRegistry.invokeFactory(ThreadSafeOperationRegistry.java:473)
at javax.media.jai.registry.RIFRegistry.create(RIFRegistry.java:332)
at com.sun.media.jai.opimage.FileStoreRIF.create(FileStoreRIF.java:138)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at javax.media.jai.FactoryCache.invoke(FactoryCache.java:122)
at javax.media.jai.OperationRegistry.invokeFactory(OperationRegistry.java:1674)
at javax.media.jai.ThreadSafeOperationRegistry.invokeFactory(ThreadSafeOperationRegistry.java:473)
at javax.media.jai.registry.RIFRegistry.create(RIFRegistry.java:332)
at javax.media.jai.RenderedOp.createInstance(RenderedOp.java:819)
at javax.media.jai.RenderedOp.createRendering(RenderedOp.java:867)
at javax.media.jai.RenderedOp.getRendering(RenderedOp.java:888)
at javax.media.jai.JAI.createNS(JAI.java:1099)
at javax.media.jai.JAI.create(JAI.java:973)
at javax.media.jai.JAI.create(JAI.java:1621)
at com.vs.graphics.concepts.TiffToJpeg.ConvertTiffToJpg(TiffToJpeg.java:30)
at com.vs.graphics.svg.SvgRefresh$1.actionPerformed(SvgRefresh.java:106)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.awt.Component.processMouseEvent(Component.java:6216)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
at java.awt.Component.processEvent(Component.java:5981)
at java.awt.Container.processEvent(Container.java:2041)
at java.awt.Component.dispatchEventImpl(Component.java:4583)
at java.awt.Container.dispatchEventImpl(Container.java:2099)
at java.awt.Component.dispatchEvent(Component.java:4413)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4556)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4220)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4150)
at java.awt.Container.dispatchEventImpl(Container.java:2085)
at java.awt.Window.dispatchEventImpl(Window.java:2475)
at java.awt.Component.dispatchEvent(Component.java:4413)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
Caused by: java.lang.OutOfMemoryError: Java heap space
at java.awt.image.DataBufferByte.<init>(DataBufferByte.java:42)
at java.awt.image.Raster.createInterleavedRaster(Raster.java:253)
at java.awt.image.Raster.createInterleavedRaster(Raster.java:194)
at com.sun.media.jai.codecimpl.JPEGImageEncoder.encode(JPEGImageEncoder.java:182)
at com.sun.media.jai.opimage.EncodeRIF.create(EncodeRIF.java:70)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at javax.media.jai.FactoryCache.invoke(FactoryCache.java:122)
at javax.media.jai.OperationRegistry.invokeFactory(OperationRegistry.java:1674)
at javax.media.jai.ThreadSafeOperationRegistry.invokeFactory(ThreadSafeOperationRegistry.java:473)
at javax.media.jai.registry.RIFRegistry.create(RIFRegistry.java:332)
at com.sun.media.jai.opimage.FileStoreRIF.create(FileStoreRIF.java:138)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at javax.media.jai.FactoryCache.invoke(FactoryCache.java:122)
at javax.media.jai.OperationRegistry.invokeFactory(OperationRegistry.java:1674)
at javax.media.jai.ThreadSafeOperationRegistry.invokeFactory(ThreadSafeOperationRegistry.java:473)
at javax.media.jai.registry.RIFRegistry.create(RIFRegistry.java:332)
at javax.media.jai.RenderedOp.createInstance(RenderedOp.java:819)
at javax.media.jai.RenderedOp.createRendering(RenderedOp.java:867)
at javax.media.jai.RenderedOp.getRendering(RenderedOp.java:888)
at javax.media.jai.JAI.createNS(JAI.java:1099)
at javax.media.jai.JAI.create(JAI.java:973)
at javax.media.jai.JAI.create(JAI.java:1621)
at com.vs.graphics.concepts.TiffToJpeg.ConvertTiffToJpg(TiffToJpeg.java:30)
at com.vs.graphics.svg.SvgRefresh$1.actionPerformed(SvgRefresh.java:106)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
Error: One factory fails for the operation "filestore"
Occurs in: javax.media.jai.ThreadSafeOperationRegistry
這是因爲內存不足錯誤。
有任何平鋪圖像Writer或Fragement的形象，作家使用它，我們只是在一個時間轉換的圖像的一部分，因此，我們可以用正常的存儲工作提供 我想可能使用的圖像分割被稱爲轉換可用。
編輯
使用pngJ直接寫入PNG文件。
我的目的是，如果我使用PNGTranscoder的，它會因提到的圖像大小的內存溢出異常轉碼SVG畫布PNG與400 DPI
。
所以我用TiledImageTranscoder它使用下面的代碼將SVG轉碼爲圖像。
protected void transcode(Document document, String uri,
TranscoderOutput output) throws TranscoderException {
// Sets up root, curTxf & curAoi
super.transcode(document, uri, output);
Filter f = this.root.getGraphicsNodeRable(true);
RenderContext rc = new RenderContext(curTxf, null, null);
RenderedImage img = f.createRendering(rc);
// prepare the image to be painted
int w = img.getWidth();
int h = img.getHeight();
try {
int bands = img.getSampleModel().getNumBands();
int[] off = new int[bands];
for (int i = 0; i < bands; i++)
off[i] = i;
SampleModel sm = new PixelInterleavedSampleModel(
DataBuffer.TYPE_BYTE, w, (100000 + w - 1)/w, bands, w
* bands, off);
RenderedImage rimg = new FormatRed(GraphicsUtil.wrap(img), sm);
TIFFImageEncoder enc = new TIFFImageEncoder(output
.getOutputStream(), null);
enc.encode(rimg);
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
所以你可以在這裏看到上面的代碼使用最後TIFFImageEncoder逐步寫入到磁盤，並在我的情況產生1.30 GB的TIFF文件的。
所以這就是爲什麼我需要將此生成的文件轉換爲PNG文件。
我這裏的問題是專門爲@leonbloy
我們可以在這裏使用PNGWriter從pngJ庫直接寫入使用400 DPI沒有內存不足錯誤的PNG文件，通過這種方式，我們可以節省時間，以及和避免不必要的轉換
或
我們可以覆蓋PngImageWriter的writeImage法pngJ庫，以便我們能夠實現我們的目標？
謝謝 米希爾Parekh的
您是否嘗試過'-Xmx' VM參數？像'-Xmx3G'這樣的最大內存使用量是3千兆字節。 – jlordo 2013-03-15 17:34:05
@jlordo請不要建議我這個參數我想運行這個代碼只使用64 - 512 MB的堆內存。建議我圖像分割 – Mihir 2013-03-15 17:39:10
我們有類似的問題。但是，我們使用本機操作系統工具來處理。調用tiff2png命令並讓操作系統處理內存問題。請參閱http://www.libpng.org/pub/png/apps/tiff2png.html。 Linux機器上默認提供的工具。 – nobody 2013-03-17 21:19:06