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ImageWriter
ClassImageReaders for a particular format using a method
from the ImageIO class, we can obtain a list of
ImageWriters:
Iterator writers = ImageIO.getImageWritersByFormatName("png");
ImageWriter writer = (ImageWriter)writers.next();
Once an ImageWriter has
been obtained, its destination must be set to an
ImageOutputStream:
File f = new File("c:\images\myimage.png");
ImageOutputStream ios = ImageIO.createImageOutputStream(f);
writer.setOutput(ios);
Finally, the image may be written to
the output stream:
BufferedImage bi; writer.write(bi);
IIOImage class is
use to store references to an image, one or more thumbnail images,
and metadata (non-image data) associated with the image. Metadata
will be discussed below; for now, we will simply pass
null as the value for the metadata-related parameters.
The ImageWriter class
contains a write method that creates a new file from
an IIOImage, and a writeInsert method
that adds an IIOImage to an existing file . By calling
the two in sequence a multi-image file may be written:
BufferedImage first_bi, second_bi;
IIOImage first_IIOImage = new IIOImage(first_bi, null, null);
IIOImage second_IIOImage = new IIOImage(second_bi, null, null);
writer.write(null, first_IIOImage, null);
if (writer.canInsertImage(1)) {
writer.writeInsert(1, second_IIOImage, null);
} else {
System.err.println("Writer can't append a second image!");
}
