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reading android jpeg EXIF metadata from picture callback

To read metadata/EXIF from image byte[] (useful for Camera.takePicture()) using version 2.9.1 of the metadata extraction library in Java by Drew Noakes: try { // Extract metadata. Metadata metadata = ImageMetadataReader.readMetadata(new BufferedInputStream(new ByteArrayInputStream(imageData)), imageData.length); // Log each directory. for(Directory directory : metadata.getDirectories()) { Log.d(“LOG”, “Directory: ” + directory.getName()); // Log all errors. for(String error : … Read more

Image Orientation – Android

You need to account for all orientations not just 90 or 180. I am using this File curFile = new File(“path-to-file”); // … This is an image file from my device. Bitmap rotatedBitmap; try { ExifInterface exif = new ExifInterface(curFile.getPath()); int rotation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL); int rotationInDegrees = exifToDegrees(rotation); Matrix matrix = new Matrix(); if … Read more

Is there a way to tell browsers to honor the jpeg exif orientation?

CSS image-orientation: from-image from the specs https://www.w3.org/TR/css4-images/#the-image-orientation 6.2. Orienting an Image on the Page: the ‘image-orientation’ property image-orientation: from-image from-image: If the image has an orientation specified in its metadata, such as EXIF, this value computes to the angle that the metadata specifies is necessary to correctly orient the image. If necessary, this angle is … Read more

Write UIImage along with metadata (EXIF, GPS, TIFF) in iPhone’s Photo library

Apple has updated their article addressing this issue (Technical Q&A QA1622). If you’re using an older version of Xcode, you may still have the article that says, more or less, tough luck, you can’t do this without low-level parsing of the image data. https://developer.apple.com/library/ios/#qa/qa1622/_index.html I adapted the code there as follows: – (void) saveImage:(UIImage *)imageToSave … Read more

How to write exif metadata to an image (not the camera roll, just a UIImage or JPEG)

I am using UIImagePickerController to get the image from the camera and my flow is a bit different than the one described by Chiquis. Here it is: – (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { UIImage *image = info[@”UIImagePickerControllerOriginalImage”]; NSString *fullPhotoFilename = …; // generate the photo name and path here NSData *photoData = [UIImage taggedImageData:image.jpegData metadata:info[@”UIImagePickerControllerMediaMetadata”] … Read more

Convert JPG/GIF image to PNG in PHP?

You just need imagepng() then. In fact it almost becomes a one-liner: imagepng(imagecreatefromstring(file_get_contents($filename)), “output.png”); You would use $_FILES[“id”][“tmp_name”] for the filename, and a different output filename obviously. But the image format probing itself would become redundant.

iOS PNG Image rotated 90 degrees

For those that want a Swift solution, create an extension of UIImage and add the following method: func correctlyOrientedImage() -> UIImage { if self.imageOrientation == .up { return self } UIGraphicsBeginImageContextWithOptions(size, false, scale) draw(in: CGRect(x: 0, y: 0, width: size.width, height: size.height)) let normalizedImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return normalizedImage ?? self; }

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