Gor*_*son 20
好像我们可以使用FreeImage(免费)来做到这一点
FIBITMAP dib = FreeImage.LoadEx("test.jp2");
//save the image out to disk
FreeImage.Save(FREE_IMAGE_FORMAT.FIF_JPEG, dib, "test.jpg", FREE_IMAGE_SAVE_FLAGS.JPEG_QUALITYNORMAL);
//or even turn it into a normal Bitmap for later use
Bitmap bitmap = FreeImage.GetBitmap(dib);
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