I need to edit EXIF data into a RAW (CR2/NEF) file with iOS. Unfortunately, the only way to manage It with Cocoa Framework is UIImageJPEGRepresentation(image, 1);, but this method compress my RAW from approximately 40MB to 10MB.
Is there some method to open my file on iOS app and edit EXIF without losing compression?
Is there some methods to edit EXIF data on RAW directly on file, avoiding the allocation on UIImage (quality loss) and using, for example, NSData?
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Alessio Crestani
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Maybe this can be helpful http://stackoverflow.com/questions/5125323/problem-setting-exif-data-for-an-image – Andrea May 04 '16 at 07:26
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Check this post [How to write or modify EXIF data for an existing image on the filesystem, without loading the image?](http://stackoverflow.com/questions/11715631/how-to-write-or-modify-exif-data-for-an-existing-image-on-the-filesystem-withou) – Dipen Panchasara May 04 '16 at 07:31
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Neither of the link above works for RAW files. Both of them load the image as JPEG and ruin everything :( – Xiao Xiao Jul 04 '17 at 11:27
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Did you ever figure this out Alessia? – Chris May 17 '22 at 12:31