Uploaded pictures are reencoded

[mems]

Safari Mobile: strips out (some) metadata and reencode image data (affect Error Level Analysis, image data digest / image signature). Upload a sanitized image. Same for FileReader API

See also:

• FotoForensics
• FotoForensics
• Comparing -- IM v6 Examples - Finding Duplicate Images
• php - Image upload from iphone strips exif data - Stack Overflow
• iphone - losing GPS metadata while uploading picture with mobile Safari - Stack Overflow
• Flickr: The Help Forum: No Exif data when uploading with iPad