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GifEncoder
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com.gif4j.light</FONT>
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Class GifEncoder</H2>
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java.lang.Object
<IMG SRC="../../../resources/inherit.gif" ALT="extended by"><B>com.gif4j.light.GifEncoder</B>
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<DT>public class <B>GifEncoder</B><DT>extends java.lang.Object</DL>
<P>
<p><code>GifEncoder</code> is a java class which takes as image(-s), encodes and saves it(them) out to a file or output stream using the GIF file format (GIF89a version). It can be used to save <code>Image</code> instances as non-animated GIF image files or prepared from the images sequence <code>GifImage</code> instances as animated GIF image files. If an encoding <code>Image</code> instance has more than 256 colors then before writing it as a GIF to the specified output stream it's automatically quantized to 256 unique colors. <code>GifEncoder</code> java class is thread safe and can be used without addittional synchronization.<br> </p> <p>The following 2 java examples demostrate common ways to use this java gif image encoder. Please peruse the API, tutorial and external examples for additional features.</p> <p> <h3>Save an image as a commented GIF file using Java</h3> <pre> import com.gif4j.light.GifEncoder; import com.gif4j.light.GifFrame; import com.gif4j.light.GifImage; import java.awt.*; import java.io.File; import java.io.IOException; // ... public void saveImageAsGif(Image image, String comment, File fileToSave) throws IOException, InterruptedException { // create new GifImage GifImage gifImage = new GifImage(); // create new GifFrame GifFrame gifFrame = new GifFrame(image); // add GifFrame to GifImage gifImage.addGifFrame(gifFrame); // add our comment gifImage.addComment(comment); // save gifImage GifEncoder.encode(gifImage, fileToSave); } </pre> </p> <p> <h3>Save array of images as an animated GIF file using Java</h3> <pre> import com.gif4j.light.GifEncoder; import com.gif4j.light.GifFrame; import com.gif4j.light.GifImage; import java.awt.*; import java.io.File; import java.io.IOException; // ... public void saveImageArrayAsAnimatedGif(Image[] images, File fileToSave) throws IOException, InterruptedException { // create new GifImage instance GifImage gifImage = new GifImage(); // set default delay between gif frames gifImage.setDefaultDelay(200); // set infinite looping (by default only 1 looping iteration is set) gifImage.setLoopNumber(0); // add comment to gif image gifImage.addComment("Animated GIF image example"); // add images wrapped by GifFrame for (int i = 0; i < images.length; i++){ GifFrame nextFrame = new GifFrame(images[i]); // clear logic screen after every frame nextFrame.setDisposalMethod(GifFrame.DISPOSAL_METHOD_RESTORE_TO_BACKGROUND_COLOR); gifImage.addGifFrame(nextFrame); } // save animated gif image GifEncoder.encode(gifImage, fileToSave); } </pre> </p> <p><b>Note:</b> After encoding a <code>GifImage</code> instance and its' internal <code>GifFrame</code>(-s) are disposed to free memory and can't be reused!</p> The following specification "GRAPHICS INTERCHANGE FORMAT(sm) Version 89a" was referenced for the development of this encoder.<br> Some of the naming conventions and clarification of some aspects of GIF file format and LZW compression were obtained from the following:<br> LZW.C <br> Copyright (c) 1989 Mark R. Nelson<br> LZW data compression/expansion demonstration program.<br> May 12, 1997<br>
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<DL>
<DT><B>Version:</B></DT> <DD>1.0</DD><DT><B>Author:</B></DT> <DD><a href="http://www.gif4j.com">Gif4J Software - Java GIF image processing solutions</a></DD><DT><B>See Also:</B><DD><A HREF="../../../com/gif4j/light/GifImage.html" title="class in com.gif4j.light"><CODE>GifImage</CODE></A>, <CODE>Image</CODE></DL>
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<CODE>static void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/gif4j/light/GifEncoder.html#encode(com.gif4j.light.GifImage, java.io.File)">encode</A></B>(<A HREF="../../../com/gif4j/light/GifImage.html" title="class in com.gif4j.light">GifImage</A> gifImage, java.io.File output)</CODE>
<BR>
Encode and write out the data contained in the <A HREF="../../../com/gif4j/light/GifImage.html" title="class in com.gif4j.light"><CODE>GifImage</CODE></A> to a <code>File</code> in the GIF output format ('89a' version). </TD>
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<CODE>static void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/gif4j/light/GifEncoder.html#encode(com.gif4j.light.GifImage, java.io.File, boolean)">encode</A></B>(<A HREF="../../../com/gif4j/light/GifImage.html" title="class in com.gif4j.light">GifImage</A> gifImage, java.io.File output, boolean forceGlobalColorTableUsage)</CODE>
<BR>
Encode and write out the data contained in the <A HREF="../../../com/gif4j/light/GifImage.html" title="class in com.gif4j.light"><CODE>GifImage</CODE></A> to a <code>File</code> in the GIF output format ('89a' version). </TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/gif4j/light/GifEncoder.html#encode(com.gif4j.light.GifImage, java.io.OutputStream)">encode</A></B>(<A HREF="../../../com/gif4j/light/GifImage.html" title="class in com.gif4j.light">GifImage</A> gifImage, java.io.OutputStream outputStream)</CODE>
<BR>
Encode and write out the data contained in the <A HREF="../../../com/gif4j/light/GifImage.html" title="class in com.gif4j.light"><CODE>GifImage</CODE></A> to the specified output stream in the GIF image file format ('89a' version).</TD>
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<CODE>static void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/gif4j/light/GifEncoder.html#encode(com.gif4j.light.GifImage, java.io.OutputStream, boolean)">encode</A></B>(<A HREF="../../../com/gif4j/light/GifImage.html" title="class in com.gif4j.light">GifImage</A> gifImage, java.io.OutputStream outputStream, boolean forceGlobalColorTableUsage)</CODE>
<BR>
Encode and write out the data contained in the <A HREF="../../../com/gif4j/light/GifImage.html" title="class in com.gif4j.light"><CODE>GifImage</CODE></A> to the specified output stream in the GIF file format ('89a' version).</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/gif4j/light/GifEncoder.html#encode(java.awt.Image, java.io.DataOutput)">encode</A></B>(java.awt.Image image, java.io.DataOutput dataOutput)</CODE>
<BR>
Encode and write out the data contained in the <code>Image</code> to the specified output in the GIF89a file format.</TD>
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<CODE>static void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/gif4j/light/GifEncoder.html#encode(java.awt.Image, java.io.File)">encode</A></B>(java.awt.Image image,⌨️ 快捷键说明
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