Im open and edit EXIF (or TIFF...) data in my jpg file.
Please help me save (override) my jpg file with editing data.
Working with this simple code:
let fileURL = URL(fileURLWithPath: "/Users/test/Pictures/IMG_2808.jpg")
if let imageSource = CGImageSourceCreateWithURL(fileURL as CFURL, nil) {
var imageProperties = CGImageSourceCopyPropertiesAtIndex(imageSource, 0, nil) as Dictionary?
let exifDict = imageProperties?[kCGImagePropertyExifDictionary]
if let UserComment = exifDict?[kCGImagePropertyExifUserComment] ?? nil {
print("kCGImagePropertyExifUserComment: \(UserComment)")
}
else {
exifDict!.setValue("My comment...", forKey: kCGImagePropertyExifUserComment as String)
imageProperties![kCGImagePropertyExifDictionary] = exifDict
// What I should do in the next step for update and override my jpg file on disk?
// Maybe this is not nice way for this realisation? Please help
//
}
}
After some test Im found a solution:
let fileURL = URL(fileURLWithPath: "/Users/test/Pictures/IMG_2808.jpg")
if let imageSource = CGImageSourceCreateWithURL(fileURL as CFURL, nil) {
var imageProperties = CGImageSourceCopyPropertiesAtIndex(imageSource, 0, nil) as Dictionary?
let exifDict = imageProperties?[kCGImagePropertyExifDictionary]
if let UserComment = exifDict?[kCGImagePropertyExifUserComment] ?? nil {
print("kCGImagePropertyExifUserComment: \(UserComment)")
}
else {
exifDict!.setValue("My comment...", forKey: kCGImagePropertyExifUserComment as String)
imageProperties![kCGImagePropertyExifDictionary] = exifDict
if let imageDestination = CGImageDestinationCreateWithURL(fileURL as CFURL, kUTTypeJPEG, 1, nil) {
CGImageDestinationAddImageFromSource(imageDestination, imageSource, 0, imageProperties as CFDictionary?)
CGImageDestinationFinalize(imageDestination)
}
}
}
I don't know if this solution is true but it works!
Please comment if you know more perfected way
Related
I am trying to write gps coordinates to an image that is taken within my app. So i looked around for code to use, and i wrote a function that takes Data and also returns Data (since i need to send it like this to Firebase.
But no matter how i seem to write this code the metadata won't "stick" to the picture. The picture looks correct when it uploads, but upon download it doesn't contain any more metadata than the size of the photo.
Have I totally missed out on something here?
func setMetaData(imageData: Data) -> Data? {
var source: CGImageSource? = nil
source = CGImageSourceCreateWithData((imageData as CFData?)!, nil)
let metadata = CGImageSourceCopyPropertiesAtIndex(source!, 0, nil) as? [AnyHashable: Any]
var metadataAsMutable = metadata
var EXIFDictionary = (metadataAsMutable?[(kCGImagePropertyExifDictionary as String)]) as? [AnyHashable: Any]
var GPSDictionary = (metadataAsMutable?[(kCGImagePropertyGPSDictionary as String)]) as? [AnyHashable: Any]
if !(EXIFDictionary != nil) {
EXIFDictionary = [AnyHashable: Any]()
}
if !(GPSDictionary != nil) {
GPSDictionary = [AnyHashable: Any]()
}
GPSDictionary![(kCGImagePropertyGPSLatitude as String)] = 30.21313
GPSDictionary![(kCGImagePropertyGPSLongitude as String)] = 76.22346
let dest_data = NSMutableData()
guard let imageDest = CGImageDestinationCreateWithData(dest_data as CFMutableData, kUTTypeJPEG, 1, nil) else { return nil }
CGImageDestinationAddImageFromSource(imageDest, source!, 0, (metadataAsMutable as CFDictionary?))
if CGImageDestinationFinalize(imageDest) {
return dest_data as Data
} else {
print("FAILED")
}
return nil
}
I found a solution that's not super pretty, but it totally does the job
func addMetaData(data: Data) -> NSData? {
guard let source = CGImageSourceCreateWithData(data as CFData, nil) else {return nil}
guard let type = CGImageSourceGetType(source) else {return nil}
let mutableData = NSMutableData(data: data)
guard let destination = CGImageDestinationCreateWithData(mutableData, type, 1, nil) else {
return nil}
guard let path = Bundle.main.url(forResource: "predict_pic", withExtension: "jpg") else {
return nil }
let imageSource = CGImageSourceCreateWithURL(path as CFURL, nil)
let imageProperties = CGImageSourceCopyMetadataAtIndex(imageSource!, 0, nil)
let mutableMetadata = CGImageMetadataCreateMutableCopy(imageProperties!)
CGImageMetadataSetValueMatchingImageProperty(mutableMetadata!, kCGImagePropertyGPSDictionary, kCGImagePropertyGPSLatitudeRef, "N" as CFTypeRef)
CGImageMetadataSetValueMatchingImageProperty(mutableMetadata!, kCGImagePropertyGPSDictionary, kCGImagePropertyGPSLatitude, location.coordinate.latitude as CFTypeRef)
CGImageMetadataSetValueMatchingImageProperty(mutableMetadata!, kCGImagePropertyGPSDictionary, kCGImagePropertyGPSLongitudeRef, "E" as CFTypeRef)
CGImageMetadataSetValueMatchingImageProperty(mutableMetadata!, kCGImagePropertyGPSDictionary, kCGImagePropertyGPSLongitude, location.coordinate.longitude as CFTypeRef)
let finalMetadata:CGImageMetadata = mutableMetadata!
CGImageDestinationAddImageAndMetadata(destination, UIImage(data: data)!.cgImage! , finalMetadata, nil)
guard CGImageDestinationFinalize(destination) else { return nil }
return mutableData;
}
In my project trying to import GIF from UIImage picker. GIF image picked from gallery will certain actions like play and stop. Right now I can able to select GIF mage from gallery but result shows as image not gif image.
Can anyone help me out of this.
Try this it will help you.
Step1: Create a global variable
var IMG:String?
Step2: put this function in your code.
func getFileName(info: [String : Any]) -> String {
if let assetPath = info[UIImagePickerControllerReferenceURL] as? URL {
let result = PHAsset.fetchAssets(withALAssetURLs: [assetPath], options: nil)
let asset = result.firstObject
let fileName = asset?.value(forKey: "filename")
let fileUrl = URL(string: fileName as! String)
if let name = fileUrl?.deletingPathExtension().lastPathComponent {
print(name)
//let assetPath = info[UIImagePickerControllerReferenceURL] as! NSURL
if (assetPath.absoluteString.hasSuffix("JPG")) {
sonu = "JPG"
print("JPG")
}
else if (assetPath.absoluteString.hasSuffix("PNG")) {
sonu = "PNG"
print("PNG")
}
else if (assetPath.absoluteString.hasSuffix("GIF")) {
sonu = "GIF"
print("GIF")
}
else {
sonu = "Unknown"
print("Unknown")
}
return name
}
}
return ""
}
Step3: Set this code in your ImagePickerController
if let image = info[UIImagePickerControllerEditedImage] as? UIImage
{
imageview.image = image
let IMG = getFileName(info: info)
print(IMG)
if IMG == "JPG"
{
imageDataForApi = UIImagePNGRepresentation(image)
}
else if IMG == "GIF"
{
imageDataForApi = UIImageJPEGRepresentation(image, 0)
}
}
self.dismiss(animated: true) { () -> Void in
}
I'm trying to modify the metadata of images but it seems that the file size of original image decreases considerably that annoying me too much. If the size of image is 6MB than it goes down to 3.2MB after modification. I know its strange but not impossible. Is there anyone to help me out in order to solve this issue. Your help will be appreciated.
Here is my code written in swift 2.0 and tool is Xcode 7.3.1 .
func writeProperties(url:NSURL, override: Bool) -> NSURL?{
guard let directory = url.URLByDeletingLastPathComponent else { return nil }
guard let base = url.URLByDeletingPathExtension?.lastPathComponent else { return nil }
guard let ext = url.pathExtension else { return nil }
let newName = override ? url.lastPathComponent! : "\(base)_modified.\(ext)"
let newPath = directory.URLByAppendingPathComponent(newName, isDirectory: false)
print("writeProperties to \(newPath)")
guard let imageSource = CGImageSourceCreateWithURL(url, nil) else { return nil }
let imageType = CGImageSourceGetType(imageSource)!
let data = NSMutableData()
guard let imageDestination = CGImageDestinationCreateWithData(data, imageType, 1, nil) else { return nil }
CGImageDestinationAddImageFromSource(imageDestination, imageSource, 0, saveProperties)
CGImageDestinationFinalize(imageDestination)
if let _ = try? data.writeToURL(newPath, options: NSDataWritingOptions.AtomicWrite) {
let alert = NSAlert()
alert.messageText = "Image Saved"
alert.informativeText = "Image saved to \(newPath.path!)"
alert.runModal()
return newPath
}
return nil
}
I searched for getting the EXIF data from picture files and write them back for Swift. But I only could find predefied libs for different languages.
I also found references to "CFDictionaryGetValue", but which keys do I need to get the data? And how can I write it back?
I'm using this to get EXIF infos from an image file:
import ImageIO
let fileURL = theURLToTheImageFile
if let imageSource = CGImageSourceCreateWithURL(fileURL as CFURL, nil) {
let imageProperties = CGImageSourceCopyPropertiesAtIndex(imageSource, 0, nil)
if let dict = imageProperties as? [String: Any] {
print(dict)
}
}
It gives you a dictionary containing various informations like the color profile - the EXIF info specifically is in dict["{Exif}"].
Swift 4
extension UIImage {
func getExifData() -> CFDictionary? {
var exifData: CFDictionary? = nil
if let data = self.jpegData(compressionQuality: 1.0) {
data.withUnsafeBytes {(bytes: UnsafePointer<UInt8>)->Void in
if let cfData = CFDataCreate(kCFAllocatorDefault, bytes, data.count) {
let source = CGImageSourceCreateWithData(cfData, nil)
exifData = CGImageSourceCopyPropertiesAtIndex(source!, 0, nil)
}
}
}
return exifData
}
}
Swift 5
extension UIImage {
func getExifData() -> CFDictionary? {
var exifData: CFDictionary? = nil
if let data = self.jpegData(compressionQuality: 1.0) {
data.withUnsafeBytes {
let bytes = $0.baseAddress?.assumingMemoryBound(to: UInt8.self)
if let cfData = CFDataCreate(kCFAllocatorDefault, bytes, data.count),
let source = CGImageSourceCreateWithData(cfData, nil) {
exifData = CGImageSourceCopyPropertiesAtIndex(source, 0, nil)
}
}
}
return exifData
}
}
You can use AVAssetExportSession to write metadata.
let asset = AVAsset(url: existingUrl)
let exportSession = AVAssetExportSession(asset: asset, presetName: AVAssetExportPresetHighestQuality)
exportSession?.outputURL = newURL
exportSession?.metadata = [
// whatever [AVMetadataItem] you want to write
]
exportSession?.exportAsynchronously {
// respond to file writing completion
}
I am looking for a way to to upload an image file, resize it (in order to reduce the total file size), and then save it as a png. I think there must be a fairly straightforward way of doing this, but hours of searching around have yielded no effective results. I have been able to achieve the desired file size by exporting the image as a compressed JPEG, but I need to preserve transparency. Here is the code I used to get the JPEG:
func chooseImage () {
var image = NSImage()
//choose image from hard disk
let panel = NSOpenPanel()
panel.allowsMultipleSelection = false
panel.canChooseFiles = true
panel.canChooseDirectories = false
panel.runModal()
panel.allowedFileTypes = ["png", "jpeg", "jpg"]
let chosenFile = panel.URL
//convert to NSData and send to Jpeg function
if chosenFile != nil {
image = NSImage(contentsOfURL: chosenFile!)!
let imageData = image.TIFFRepresentation
self.saveAsJpeg(imageData!, compression: 0.5)
}
}
func saveAsJpeg (image:NSData, compression:NSNumber) {
// make imagerep and define properties
let imgRep = NSBitmapImageRep(data: image)
let props = NSDictionary.init(object: compression, forKey: NSImageCompressionFactor)
let pingy = imgRep?.representationUsingType(NSBitmapImageFileType.NSJPEGFileType, properties: props as! [String : AnyObject])
//save to disk
let documentURL = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask).first!
let folderURL = documentURL.URLByAppendingPathComponent("KKNightlife Data")
let g = GetUniqueID()
let fileName = g.getUniqueID() + ".jpeg"
do {
try NSFileManager.defaultManager().createDirectoryAtURL(folderURL, withIntermediateDirectories: false, attributes: nil)
} catch {
print("cannot create directory - folder Exists?")
}
let url = folderURL.URLByAppendingPathComponent(fileName)
if let pid = pingy {
pid.writeToURL(url, atomically: false)
} else {
print("error saving image")
}
}
I attempted to use the following code to scale the image in order to create a smaller .png file, but no matter what values I enter for the size, the resulting file is the same size (both in terms of height/width and overall file size):
func chooseImage (size:String) {
let panel = NSOpenPanel()
panel.allowsMultipleSelection = false
panel.canChooseFiles = true
panel.canChooseDirectories = false
panel.runModal()
panel.allowedFileTypes = ["png", "jpeg", "jpg"]
let chosenFile = panel.URL
if chosenFile != nil {
let image = NSImage(contentsOfURL: chosenFile!)
self.scaleImage(image!)
}
}
func scaleImage (image:NSImage) {
//create resized image
let newSize = NSSize(width: 10, height: 10)
var imageRect:CGRect = CGRectMake(0, 0, image.size.width, image.size.height)
let imageRef = image.CGImageForProposedRect(&imageRect, context: nil, hints: nil)
let resizedImage = NSImage(CGImage: imageRef!, size: newSize)
let imageData = resizedImage.TIFFRepresentation
//make imagerep
let imgRep = NSBitmapImageRep(data: imageData!)
let pingy = imgRep?.representationUsingType(NSBitmapImageFileType.NSPNGFileType, properties: [:])
//save to disk
let documentURL = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask).first!
let g = GetUniqueID()
let fileName = g.getUniqueID() + ".png"
let folderURL = documentURL.URLByAppendingPathComponent("KKNightlife Data")
do {
try NSFileManager.defaultManager().createDirectoryAtURL(folderURL, withIntermediateDirectories: false, attributes: nil)
} catch {
print("cannot create directory - folder Exists?")
}
let url = folderURL.URLByAppendingPathComponent(fileName)
if let pid = pingy {
pid.writeToURL(url, atomically: false)
print("image is at \(documentURL)")
} else {
print("error saving image")
}
}
Any suggestions would be greatly appreciated.
I was finally able to do this using the extensions found here:
https://gist.github.com/raphaelhanneken/cb924aa280f4b9dbb480
This is how I ended up calling them in case anyone encounters similar problems:
func chooseImage (size:String) {
let panel = NSOpenPanel()
panel.allowsMultipleSelection = false
panel.canChooseFiles = true
panel.canChooseDirectories = false
panel.runModal()
panel.allowedFileTypes = ["png", "jpeg", "jpg"]
let chosenFile = panel.URL
if chosenFile != nil {
let image = NSImage(contentsOfURL: chosenFile!)
self.scaleImageUsingExtensions(image!)
}
}
func scaleImageUsingExtensions (image:NSImage){
let size: NSSize = NSMakeSize(10, 10)
let resizedImage = image.resizeWhileMaintainingAspectRatioToSize(size)
let documentURL = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask).first!
let g = GetUniqueID()
let fileName = g.getUniqueID() + ".png"
let folderURL = documentURL.URLByAppendingPathComponent("KKNightlife Data")
do {
try NSFileManager.defaultManager().createDirectoryAtURL(folderURL, withIntermediateDirectories: false, attributes: nil)
} catch {
print("cannot create directory - folder Exists?")
}
let url = folderURL.URLByAppendingPathComponent(fileName)
do {
try resizedImage?.savePNGRepresentationToURL(url)
}
catch {
print("error saving file")
}
}