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Editorial Team
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Asked: 2026-05-15T15:42:48+00:00

Should I write BufferedOutputStream os = new BufferedOutputStream(new FileOutputStream(file)); ImageIO.write(im, JPEG, os); instead of

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Should I write

BufferedOutputStream os = new BufferedOutputStream(new FileOutputStream(file));
ImageIO.write(im, "JPEG", os);

instead of 

ImageIO.write(im, "JPEG", file);

I.e. are ImageIO file operations buffered by default or not?

Thanks!

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1 Answer

  1. Editorial Team

    If you pass in a File, the underlying implementation will write directly to a RandomAccessFile (created in "rw" mode), so no buffering. Specifically, a FileImageOutputStream will be used as the ImageOutputStream.

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