Hi Cotton, I think your concerns are valid. I had a quick look and couldn't see in updateExifMetadataLossy() chain of methods called anywhere where it would update the ImageWidth and ImageLength.
But probably the best way is to test yourself to verify it. You can try the following: 1. Grab an image with some EXIF data 2. Run exiftool and save the output somewhere 3. Run your code 4. Run exiftool again on the reduced image, save the output somewhere 5. Diff the output I **think** you would have to adjust the image/length. But it would be nice to confirm that. We should improve the javadoc of these classes as well to document whether developers should worry about that or not. I'm moving between countries this week/weekend, so I won't have time to create issues and work on that for a while. But you can reply here if you are able to confirm, or ping this thread again in a few months and I'd be happy to try that. If you find anything broken or have suggestions for improvements in Commons Imaging, feel free to create a JIRA Issue for those tasks. As for language, do not worry because your English is fine. If you need help translating, try deepl.com, Google Translate, and other free translation services that may assist you too (that's what I'm doing right now, as I'm going to a country where I don't speak the native language :) Cheers Bruno On Wed, 26 Oct 2022 at 22:27, cottonspace <cottonsp...@gmail.com> wrote: > Hello. I don't use English on a usually. Sorry for the hard-to-read my > message. > > Thank you for publishing such a wonderful library. > > I want to resize an image, and apply Exif meta information (orientation > direction, author, and so on) in original to the image after resized image. > My code is like this. > > --- begin --- > // Original Image > byte[] original = load(file); // some loader > > // Edit (resize, rotate, ..) > byte[] resized = resize(original, width, height); // some edit methods > > // Apply original metadata into resized image > TiffImageMetadata exif = ((JpegImageMetadata) > Imaging.getMetadata(original)).getExif(); > ByteArrayOutputStream baos = new ByteArrayOutputStream(); > new ExifRewriter().updateExifMetadataLossy(resized, baos, > exif.getOutputSet()); > byte[] result = baos.toByteArray(); > --- end --- > > Can I apply the OutputSet got from the original image to the image after > resizing with ExifRewriter ? > > My question is that if the Dimension information such as Orientation > information contained in Exif is reflected by ExifRewriter, it will affect > the actual image size. Doesn't the direction and the Exif information > conflict with each other? > > My concerns are unnecessary? Please teach me. > > -- > cotton >
