Photos & Camera

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Explore technical aspects of capturing high-quality photos and videos, including exposure control, focus modes, and RAW capture options.

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Calibration data for both cameras in MultiCam mode
In my project I’m using AVCaptureMultiCamSession where main camera device type is .builtInWideAngleCamera and second one is .builtInUltraWideCamera. Backend team requires to send them following data: • Intrinsic Matrix of each camera (3x3 matrix). • Possibly accessible Distortion coefficients (not lensDistortionLookupTable). So my questions are: ⁃ is it possible to retrieve intrinsicMatrix for both builtInWideAngleCamera and builtInUltraWideCamera during AVCaptureMultiCamSession? ⁃ is there a way to get distortion coefficient (not lensDistortionLookupTable) for both builtInWideAngleCamera and builtInUltraWideCamera during AVCaptureMultiCamSession?
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294
Jul ’24
Performant alternative to scaling a CIImage / PixelBuffer
Hey, I’m building a camera app where I am applying real time effects to the view finder. One of those effects is a variable blur, so to improve performance I am scaling down the input image using CIFilter.lanczosScaleTransform(). This works fine and runs at 30FPS, but when running the metal profiler I can see that the scaling transforms use a lot of GPU time, almost as much as the variable blur. Is there a more efficient way to do this? The simplified chain is like this: Scale down viewFinder CVPixelBuffer (CIFilter.lanczosScaleTransform) Scale up depthMap CVPixelBuffer to match viewFinder size (CIFilter.lanczosScaleTransform) Create CIImages from both CVPixelBuffers Apply VariableDepthBlur (CIFilter.maskedVariableBlur) Scale up final image to metal view size (CIFilter.lanczosScaleTransform) Render CIImage to a MTKView using CIRenderDestination From some research, I wonder if scaling the CVPixelBuffer using the accelerate framework would be faster? Also, Instead of scaling the final image, perhaps I could offload this to the metal view? Any pointers greatly appreciated!
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Jul ’24
Photos Picker Selection
Hi! I am having a bit of trouble with the Photos Picker. In my app, users are able to select photos to appear in a grid, right in the app. I am using the new Photos Picker with SwiftUI. I want to be able to have my users select the images after they have been added to the View. So I want there to be a select button in the top toolbar on the leading side, and then once the user hits the select button, they can select the photos they want to remove on the grid, just like in the photos app, and then where the button to add photos originally is, there will be a trash icon to remove the selected photos from the grid. How would I do this? I have attached my code below for my view, as well as my PhotoPicker: import PhotosUI struct LifestyleImagePicker: View { @StateObject var imagePicker = ImagePicker() @State private var showingDetail = false @State private var selectedIndex = 0 @State private var isSelecting = false @State private var isAddingPhoto = false let columns = [GridItem(.adaptive(minimum: 100))] var body: some View { NavigationSplitView { VStack { if !imagePicker.images.isEmpty { ScrollView { LazyVGrid(columns: columns, spacing: 3) { ForEach(imagePicker.images.indices, id: \.self) { index in imagePicker.images[index] .resizable() .scaledToFit() .onTapGesture { selectedIndex = index showingDetail = true } } } } } else { Text("Tap the plus icon to add photos to your own Inspo Board.") .multilineTextAlignment(.center) } } .padding() .navigationTitle("Lifestyle") .toolbar { ToolbarItem(placement: .navigationBarTrailing) { PhotosPicker(selection: $imagePicker.imageSelections, maxSelectionCount: 10, matching: .images, photoLibrary: .shared()) { Image(systemName: "photo.badge.plus") .imageScale(.large) } } } } detail: { Text("Pick your lifestyle") } .sheet(isPresented: $showingDetail) { DetailImageView(images: $imagePicker.images, selectedIndex: selectedIndex) } } } #Preview { LifestyleImagePicker() } import PhotosUI import Combine import Foundation @MainActor class ImagePicker: ObservableObject { @Published var image: Image? @Published var images: [Image] = [] @Published var imageSelection: PhotosPickerItem? { didSet { if let imageSelection { Task { try await loadTransferable(from: imageSelection) } } } } @Published var imageSelections: [PhotosPickerItem] = [] { didSet { Task { if !imageSelections.isEmpty { try await loadTransferable(from: imageSelections) imageSelections = [] } } } } func loadTransferable(from imageSelections: [PhotosPickerItem]) async throws { do { for imageSelection in imageSelections { if let data = try await imageSelection.loadTransferable(type: Data.self) { if let uiImage = UIImage(data: data) { self.images.append(Image(uiImage: uiImage)) } } } } catch { print(error.localizedDescription) } } func loadTransferable(from imageSelection: PhotosPickerItem?) async throws { do { if let data = try await imageSelection?.loadTransferable(type: Data.self) { if let uiImage = UIImage(data: data) { self.image = Image(uiImage: uiImage) } } } catch { print(error.localizedDescription) image = nil } } }
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Jul ’24
Camera is not detected by using ImageCaptureCore framework
Hi, Currently my app is using ImageCaptureCore framework to work with DSLR camera. But when I tested it in iOS 18, it turns out my camera cannot do connection with iPhone by wired connection. It seems there are some developer run into the same problem, there are: https://forums.developer.apple.com/forums/thread/756960 https://stackoverflow.com/questions/78618886/icdevicebrowser-fails-to-find-any-devices-after-ios-18-update And it’s reproduced in some apps that expected to use ImageCaptureCore framework. I’d like to clarify that: Is the issue currently iOS 18 bugs? Is there any plan of Apple to remove wired connection support of ImageCaptureCore framework? Thank you.
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359
Jul ’24
How to open adobe raw image with phpickerviewcontroller
Hi, Experts I am using phpickerviewcontroller to open photos in iPhone. It works well for most of photos, such as jpeg, heif. But it failed for photo with raw image on iPhone14 plus. And I found the TypeIdentifier for it is com.adobe.raw-image. I use result.itemProvider.loadFileRepresentation(forTypeIdentifier: "com.adobe.raw-image") to load the raw photo, it always failed, with "Error loading file representation: Cannot load representation of type com.adobe.raw-image". I had try some other param: such as forTypeIdentifier: public.image, public.camera-raw-image, both of them did not work. How can I load this type of raw photo? Below is my code details: // MARK: - PHPickerViewControllerDelegate func picker(_ picker: PHPickerViewController, didFinishPicking results: [PHPickerResult]) { picker.dismiss(animated: true, completion: nil) var resultIndex = 0 DDLogInfo("Pick \(results.count) photos") for result in results { resultIndex += 1 DDLogInfo("Process \(resultIndex) photo") DDLogInfo("Registered type identifiers for itemProvider:") for typeIdentifier in result.itemProvider.registeredTypeIdentifiers { DDLogInfo("TypeIdentifier \(typeIdentifier)") } if(result.itemProvider.hasItemConformingToTypeIdentifier(UTType.image.identifier)) { DDLogInfo("Result \(resultIndex) is image") } if result.itemProvider.canLoadObject(ofClass: UIImage.self) { DDLogInfo("Can load \(resultIndex) image") //more code for photo } else { DDLogInfo("Load special image, such as raw") result.itemProvider.loadFileRepresentation(forTypeIdentifier: "com.adobe.raw-image") { url, error in if let error = error { DDLogInfo("Error loading file representation: \(error.localizedDescription)") return }
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Jul ’24
Strange asset url suffix on iOS 18 (method PHCachingImageManager().requestAVAsset(forVideo:... )
Hello pals, I investigated strange bug with video url and found out that on iOS 18 method PHCachingImageManager().requestAVAsset(forVideo: returns very weird asset.url with strange suffix "someFileName.MOV#YnBsaXN0MDDRAQJfEBtSZWNvbW1lbmRlZEZvckltbWVyc2l2ZU1vZGUQAAgLKQAAAAAAAAEBAAAAAAAAAAMAAAAAAAAAAAAAAAAAAAAr" example: PHCachingImageManager().requestAVAsset(forVideo: asset, options: options) { asset, _, _ in if let asset = asset as? AVURLAsset { print(asset.url) // prints - file:///.../data/Media/DCIM/100APPLE/IMG_0011.MOV#YnBsaXN0MDDRAQJfEBtSZWNvbW1lbmRlZEZvckltbWVyc2l2ZU1vZGUQAAgLKQAAAAAAAAEBAAAAAAAAAAMAAAAAAAAAAAAAAAAAAAAr } } on iOS below 18 - it return regular url "...someFile.MOV" how to correct this bug for iOS 18 users? Please suggest me something, or maybe I'm using this method incorrectly?
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Jul ’24
Airdrop Photos Lose Quality
Hi, I’m a photographer and recently after I upgrade to ios 18 beta, noticed that when I airdrop my photos (which I took with medium format cameras with extremely high quality) from my macbook pro to my iphone, they lose quality alot!! The sharpness is completely gone, and details are very less. Does anyone know how to solve this?!
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Jul ’24
Questions about LockedCameraCapture
Can the extended code created by Capture Extension call the code of the main project? I added the control via Widget Extension and I see the perform method is called in my intent but I am missing the part where this perform method will open the UI to capture the photo. This is my intent: struct MyAppCaptureIntent: CameraCaptureIntent { static var title: LocalizedStringResource = "MyAppCaptureIntent" typealias AppContext = MyAppContext static let description = IntentDescription("Capture photos with MyApp.") @MainActor func perform() async throws -> some IntentResult { let dialog = IntentDialog("Intent result") do { if let context = try await MyAppCaptureIntent.appContext { return .result() } } catch { // Handle error condition. } return .result() } } struct MyAppContext: Decodable, Encodable { var data = ContextData() } struct ContextData: IntentResult, Decodable, Encodable { var value: Never? { nil } } How can I connect this with my LockedCameraCaptureExtension? Can you provide a complete demo?
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480
Aug ’24
some problems with vision kit
I integrated Visionkit into my app, to get content of an image. That works really fine. Now I realized that iPhone8 crashes on launching the app, because of the following code: available(iOS 17, *) extension Details: ImageAnalysisInteractionDelegate {} is there a workaround for older versions?
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282
Aug ’24
Detect when main app launched by LockedCameraCapture for permission
I have a LockedCameraCapture extension working well, however there is one situation I cannot find a solution to. If the user has not yet provided camera access permission then the main app will be launched rather than the LockedCameraCapture extension. I cannot find a mechanism by which my main app can detect that this was the reason for the launch and thereby request permission. When the button is pressed from the control center without permission the app is run and the CameraCaptureIntent is called so I can prompt the user from there. However, as best I can tell the CameraCaptureIntent is not called when launched from a locked Lock Screen, the app is simply opened. My app has a variety of functions, most of which do not involve the camera so I cannot just always prompt the user for camera access on open. Is there any mechanism by which my main app can detect it was launched for this reason so it could ask for permission? Thank you!
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Aug ’24
UIImagePickerController inside of a SwiftUI View dismisses the view, rather than firing the callback.
Hello, When using a UIImagePickerController with the .camera configuration I'm currently facing an issue where the delegate function imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) is not firing. But rather UIKit internals dismisses the parent view to the UIImagePickerController. I'm showing the picker controller through a UIViewControllerRepresentable. It does not always occur however, and the behavior is very flakey, sometimes it fires when pressing the b, sometimes it does not. When setting a breakpoint at the dismiss function when pressing the "Use Photo" button, UIKit internals dismisses the view, not my own code.
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Aug ’24
Center stage control mode not working for iPad on front camera with .photo session preset.
I am working on an iPad app using the front camera. The camera logic is implemented using the AVFoundation framework. During a session I use central stage mode to center the face with front camera . Central stage mode works fine in all cases except when I set the session preset photo. In other presets: high, medium, low, cif352x288, vga640x480, hd1280x720, hd1920x1080, iFrame960x540, iFrame1280x720, inputPriority presets central stage mode working except photo session preset. Can you explain why this happens or maybe it is an unobvious bug? Code snippet: final class CameraManager { //MARK: - Properties private let captureSession: AVCaptureSession private let photoOutput: AVCapturePhotoOutput private let previewLayer: AVCaptureVideoPreviewLayer //MARK: - Init init() { captureSession = AVCaptureSession() photoOutput = AVCapturePhotoOutput() previewLayer = AVCaptureVideoPreviewLayer(session: captureSession) } //MARK: - Methods Setup Camera and preview layer func setupPreviewLayerFrame(view: UIView) { previewLayer.frame = view.frame view.layer.insertSublayer(previewLayer, at: 0) setupCamera() } private func setupCamera() { guard let videoCaptureDevice = AVCaptureDevice.default(.builtInWideAngleCamera, for: .video, position: .front) else { return } AVCaptureDevice.centerStageControlMode = .app AVCaptureDevice.isCenterStageEnabled = true do { let input = try AVCaptureDeviceInput(device: videoCaptureDevice) captureSession.addInput(input) captureSession.addOutput(photoOutput) /// high, medium, low, cif352x288, vga640x480, hd1280x720, hd1920x1080, iFrame960x540, iFrame1280x720 and inputPriority presets working except photo session preset captureSession.sessionPreset = .photo DispatchQueue.global(qos: .userInteractive).async { self.captureSession.startRunning() } } catch { print("Error setting up camera: \(error.localizedDescription)") } } }
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Aug ’24