Read a image and write on disk,image size changed?

[jsxzliyou]

Path imageFile = Paths.get("D:/1.jpg"); Image img = ImageFactory.getInstance().fromFile(imageFile); Path imagePath = Paths.get("D:/2.jpg"); img.save(Files.newOutputStream(imagePath), "jpg");
2.jpg size less then 1.jpg

[frankfliu]

@jsxzliyou
This is expected, a couple reason can cause this happend:

1. The original file contains metadata (e.g. IDV3Tags)
2. The original file has a different color scheme than saved file (BufferredImageFactory save jpg file as TYPE_INT_ARGB format)
3. jpeg uses a lossy compression algorithm, every saving may cause the image content change.