Package javax.imageio

Java Image I / O API的主要包。

See: 描述

接口摘要

接口	描述
IIOParamController	要由可以通过放置GUI从用户获取值或通过其他方式 IIOParam对象的设置的对象来实现的接口。
ImageTranscoder	提供元数据转码功能的界面。

类摘要

类	描述
IIOImage	用于聚合图像的简单容器类，一组缩略图（预览）图像，以及表示与该图像相关联的元数据的对象。
IIOParam	描述流如何解码或编码的所有类的超类。
ImageIO	一个包含静态方便方法的类，用于定位 ImageReader和 ImageWriter s，并执行简单的编码和解码。
ImageReader	用于解析和解码图像的抽象超类。
ImageReadParam	描述流如何解码的类。
ImageTypeSpecifier	允许以方便的方式指定图像的格式（特别是其 SampleModel和 ColorModel ）的类。
ImageWriteParam	描述流如何编码的类。
ImageWriter	用于编码和写入图像的抽象超类。

异常摘要

异常	描述
IIOException	用于发信号读取和写入操作失败的异常类。

Package javax.imageio Description

The main package of the Java Image I/O API.

Many common image I/O operations may be performed using the static methods of the ImageIO class.

This package contains the basic classes and interfaces for describing the contents of image files, including metadata and thumbnails (IIOImage); for controlling the image reading process (ImageReader, ImageReadParam, and ImageTypeSpecifier) and image writing process (ImageWriter and ImageWriteParam); for performing transcoding between formats (ImageTranscoder), and for reporting errors (IIOException).

All implementations of javax.imageio provide the following standard image format plug-ins:

	Reading	Writing	Notes	Metadata
JPEG	yes	yes	none	JPEG metadata format
PNG	yes	yes	none	PNG metadata format
BMP	yes	yes	none	BMP metadata format
WBMP	yes	yes	none	WBMP metadata format
GIF	yes	yes	GIF plug-in notes	GIF metadata format

Standard Plug-in Notes

Standard plug-in for GIF image format

ImageIO provides ImageReader and ImageWriter plug-ins for the Graphics Interchange Format (GIF) image format. These are the "standard" GIF plug-ins, meaning those that are included in the JRE, as distinct from those included in standard extensions, or 3rd party plug-ins. The following notes and metadata specification apply to the standard plug-ins.

Writing GIF images

The GIF image writer plug-in guarantees lossless writing for images which meet the following requirements:

• the number of bands is 1;
• the number of bits per sample is not greater than 8;
• the size of a color component is not greater than 8;

By default the GIF writer plug-in creates version "89a" images. This can be changed to "87a" by explicitly setting the version in the stream metadata (see GIF Stream Metadata Format Specification).

The GIF writer plug-in supports the creation of animated GIF images through the standard sequence writing methods defined in the ImageWriter class.

A global color table is written to the output stream if one of the following conditions is met:

• stream metadata containing a GlobalColorTable element is supplied;
• a sequence is being written and image metadata containing a LocalColorTable element is supplied for the first image in the sequence;
• image metadata is not supplied or does not contain a LocalColorTable element.

In the first case the global color table in the stream metadata is used, in the second the local color table in the image metadata is used, and in the third a global color table is created from the ColorModel or SampleModel of the (first) image.

A local color table is written to the output stream only if image metadata containing a LocalColorTable element is supplied to the writer, or no image metadata is supplied to the writer and the local color table which would be generated from the image itself is not equal to the global color table.

A Graphic Control Extension block is written to the output stream only if image metadata containing a GraphicControlExtension element is supplied to the writer, or no image metadata is supplied and the local color table generated from the image requires a transparent index. Application, Plain Text, and Comment Extension blocks are written only if they are supplied to the writer via image metadata.

The writing of interlaced images can be controlled by the progressive mode of the provided ImageWriteParam instance. If progressive mode is MODE_DISABLED then a non-interlaced image will be written. If progressive mode is MODE_DEFAULT then an interlaced image will be written. If progressive mode is MODE_COPY_FROM_METADATA, then the metadata setting is used (if it is provided, otherwise an interlaced image will be written).

The GIF image writer plug-in supports setting output stream metadata from metadata supplied to the writer in either the native GIF stream metadata format javax_imageio_gif_stream_1.0 or the standard metadata format javax_imageio_1.0, and setting output image metadata from metadata supplied to the writer in either the native GIF image metadata format javax_imageio_gif_image_1.0 or the standard metadata format javax_imageio_1.0. The mapping of standard metadata format to the GIF native stream and image metadata formats is given in the tables here.

从以下版本开始：

1.4