It seems that the test code could not be attached, so I attach it with the
extension ".txt".
2022年10月27日(木) 13:18 cottonspace <[email protected]>:
> Hello.
>
> I executed test. and run "exiftool" for each image files.
>
> The following fields I was concerned about seem to be determined based on
> the resized image, as expected, rather than the Exif value of the original
> image.
>
> - Orientation: copy from *original* image.
> - Image Width: based on *resized* image.
> - Image Height: based on *resized* image.
> - Y Cb Cr Sub Sampling: based on *resized* image.
>
> I thought my concern was unnecessary. My question is solved.
>
> Regards.
>
--
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import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import javax.imageio.ImageIO;
import org.apache.commons.imaging.Imaging;
import org.apache.commons.imaging.ImagingException;
import org.apache.commons.imaging.formats.jpeg.JpegImageMetadata;
import org.apache.commons.imaging.formats.jpeg.exif.ExifRewriter;
import org.apache.commons.imaging.formats.tiff.TiffImageMetadata;
public class ExifCopyTest {
public static void main(String[] args) throws IOException,
ImagingException {
// Parameters
File fileOriginal = new File("original.jpg");
File fileResized = new File("resized.jpg");
File fileExifUpdated = new File("exif-updated.jpg");
// Read original image
byte[] bytesOriginal =
Files.readAllBytes(fileOriginal.toPath());
BufferedImage imageOriginal = null;
ByteArrayInputStream bais = new
ByteArrayInputStream(bytesOriginal);
imageOriginal = ImageIO.read(bais);
// Resize (half size)
int dw = imageOriginal.getWidth() / 2;
int dh = imageOriginal.getHeight() / 2;
BufferedImage imageResized = new BufferedImage(dw, dh,
imageOriginal.getType());
Graphics g = imageResized.createGraphics();
g.drawImage(imageOriginal.getScaledInstance(dw, dh,
Image.SCALE_AREA_AVERAGING), 0, 0, dw, dh, null);
g.dispose();
// Get resized image to bytes
byte[] bytesResized = null;
ByteArrayOutputStream baos1 = new ByteArrayOutputStream();
BufferedOutputStream bos1 = new BufferedOutputStream(baos1);
ImageIO.write(imageResized, "jpg", bos1);
bytesResized = baos1.toByteArray();
// Save (Resized only)
Files.write(fileResized.toPath(), bytesResized);
// Apply original metadata into resized image
TiffImageMetadata exif = ((JpegImageMetadata)
Imaging.getMetadata(bytesOriginal)).getExif();
ByteArrayOutputStream baos2 = new ByteArrayOutputStream();
new ExifRewriter().updateExifMetadataLossy(bytesResized, baos2,
exif.getOutputSet());
byte[] bytesExifUpdated = baos2.toByteArray();
// Save (Exif Updated)
Files.write(fileExifUpdated.toPath(), bytesExifUpdated);
}
}
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