DNG issues saving to and displaying in the Camera Roll

Question

Created Sep ’16

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Hello,

I have modified the AVCam sample found here: https://developer.apple.com/library/prerelease/content/samplecode/AVCam/Introduction/Intro.html to capture and save DNG files.

When attempting to save the (valid) DNG using

PHAssetCreationRequest *creationRequest = [PHAssetCreationRequest creationRequestForAsset];
[creationRequest addResourceWithType:PHAssetResourceTypePhoto data:self.photoData options:nil];

It fails with "Error Domain=NSCocoaErrorDomain Code=-1 "(null)"

Alternatively, if I try saving the DNG with:

[[[ALAssetsLibrary alloc] init] writeImageDataToSavedPhotosAlbum:self.photoData metadata:nil completionBlock:^(NSURL *assetURL, NSError *error)]

A .TIF file is saved to the Camera Roll. This photo cannot be displayed by the Camera Roll (it shows up, just shows up blank), but if I transfer that file to my computer and rename the extension to .DNG, the photo loads just fine.

Is anyone else having these issues? Is there a better / correct way to save DNGs? Are they known bugs in iOS 10 beta 8?

Thank you!

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Answer 1

mrsin88 OP

Sep ’16

Bump

I have this issue too,

Everytime I tried to save a Raw image (.NEF in this case). It convert into a .TIF with a really small resolution (160x120) in camera roll.

When I use Photo app on Mac to extract the image, I see it has a large size (11MB , same as the original RAW image) but the resolution is really small.

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