读取非常大的图像时，ImageIO.read（FileInputStream）返回null

Question

I need to read an image, resize it and then save it. However, when reading a very large image, ImageIO#read() returns null.

FileInputStream f = new FileInputStream(imagePath);     
image = ImageIO.read(f);

How is this caused and how can I solve it?

Answer 1

Image I/O has built-in support for GIF, PNG, JPEG, BMP, and WBMP only. Are you trying to load any other type of image than these. See Reading/Loading an Image for details.

You may check the list of registered readers using ImageIO.getReaderFormatNames() . For me it lists [BMP, bmp, jpg, JPG, wbmp, jpeg, png, JPEG, PNG, WBMP, GIF, gif]