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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><title>Java Image I/O API Guide: 3 - Writing Image I/O Applications</title></head><body bgcolor="#ffffff"> <table summary="layout" width="100%"><tr><td><!-- Bug in Communicator w/font: NavBar text disappears for Times 14pt pref. --><!-- font size="-1" --> <a href="imageio_guideTOC.fm.html" tppabs="http://java.sun.com/j2se/1.4.2/docs/guide/imageio/spec/imageio_guideTOC.fm.html">CONTENTS</a> | <a href="apps.fm5.html" tppabs="http://java.sun.com/j2se/1.4.2/docs/guide/imageio/spec/apps.fm5.html">PREV</a> | <a href="apps.fm7.html" tppabs="http://java.sun.com/j2se/1.4.2/docs/guide/imageio/spec/apps.fm7.html">NEXT</a> <!-- | <a href="copyright.fm.html">INDEX</a> --><!-- /font --></td><td align=right><i>Java<sup><font size="-1">TM</font></sup></font> Image I/O API Guide</i></td></tr></table><br> <p><hr size="8" width="35%" align="left" noshade><h2><a name="997067"><i>3.6 </i> Transcoding</a></h2><blockquote><a name="998285"><!-- --></a>Transcoding refers to reading an image file with a reader plug-in, and writing out the image using a writer plug-in, especially, if the writer plug-in cannot directly understand the native metadata format of the reader. In such a case, there will always be some loss of information, even if both plug-ins deal with the same file format. A transcoder plug-in is responsible for converting the stream and image metadata that have been created by a reader plug-in into a better form for use by a writer plug-in. The API does not mandate the presence of any transcoder plug-ins, but they may be installed and registered just like readers and writers.<p><a name="998289"><!-- --></a>A set of reader and writer plug-ins may be designed to interpret each other's metadata without the need for a separate transcoder. The relationships between plug-ins can be determined using the<code> ImageReaderSpi.getImageWriterSpiNames</code> and <code>ImageWriterSpi.getImageReaderSpiNames</code> methods, which indicate which plug-ins are known to work well with a given plug-in of the opposite type. If multiple plug-ins are being written by a single vendor, this mechanism will provide the best quality.<p><a name="998283"><!-- --></a>However, when working with plug-ins that have not been designed to interoperate, a transcoder plug-in may be provided by a developer who understands the metadata formats of a given pair of reader and writer plug-ins, even though each was written without knowledge of the other.<p><a name="998304"><!-- --></a>Given a particular pair of reader and writer plug-ins, the set of appropriate transcoder plug-ins may be located as follows:<p></blockquote><blockquote><pre>ImageReader reader;ImageWriter writer;Iterator transcoders = ImageIO.getImageTranscoders(reader, writer);</pre></blockquote><br><hr><!-- Bug in Communicator w/font: NavBar text disappears for Times 14pt pref. --><!-- font size="-1" --> <a href="imageio_guideTOC.fm.html" tppabs="http://java.sun.com/j2se/1.4.2/docs/guide/imageio/spec/imageio_guideTOC.fm.html">CONTENTS</a> | <a href="apps.fm5.html" tppabs="http://java.sun.com/j2se/1.4.2/docs/guide/imageio/spec/apps.fm5.html">PREV</a> | <a href="apps.fm7.html" tppabs="http://java.sun.com/j2se/1.4.2/docs/guide/imageio/spec/apps.fm7.html">NEXT</a> <!-- | <a href="copyright.fm.html">INDEX</a> --><!-- /font --><hr><font size="-1"><i><A HREF="copyright.fm.html" tppabs="http://java.sun.com/j2se/1.4.2/docs/guide/imageio/spec/copyright.fm.html">Copyright</a> © 2001 Sun Microsystems, Inc. All Rights Reserved.</i></font><!-- This HTML file was created with Quadralay WebWorks Publisher 3.5.0 --><!-- by Suzette Pelouch --><!-- Last updated: Fri Apr 27 11:22:59 2001 --> </body><script language="JavaScript" src="s_code_remote.js" tppabs="http://java.sun.com/js/omi/jsc/s_code_remote.js"></script></html>⌨️ 快捷键说明
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