captureStillImageAsynchronouslyFromConnection without JPG intermediary
image-capture, ios, uiimage
Solution
You'll need to set the outputSettings with a different pixel format. If you want 32-bit BGRA, for example, you can set:
NSDictionary *outputSettings = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithUnsignedInt:kCVPixelFormatType_32BGRA], (id)kCVPixelBufferPixelFormatTypeKey, nil];
From https://developer.apple.com/library/mac/#documentation/AVFoundation/Reference/AVCaptureStillImageOutput_Class/Reference/Reference.html, the "recommended" pixel formats are:
- `kCMVideoCodecType_JPEG`
- `kCVPixelFormatType_420YpCbCr8BiPlanarFullRange`
- `kCVPixelFormatType_32BGRA`
Of course, if you're not using JPEG output, you can't use `jpegStillImageNSDataRepresentation:`, but there's an example here: how to convert a CVImageBufferRef to UIImage
Problem
I'm trying to get as good an image as possible from the camera, but can only find examples that `captureStillImageAsynchronouslyFromConnection` and then go straight to: ``` NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer]; UIImage *image = [[UIImage alloc] initWithData:imageData]; ``` JPEG being lossy and all, is there any way to get the data as PNG, or even just RGBA (BGRA, what-have-you?). AVCaptureStillImageOutput doesn't seem to have any other NSData* methods.... Actually looking at the CMSampleBufferRef, it seems like it's already locked as JPEG ~ ``` formatDescription = <CMVideoFormatDescription 0xfe5e1f0 [0x3e5ac650]> { mediaType:'vide' mediaSubType:'jpeg' mediaSpecific: { codecType: 'jpeg' dimensions: 2592 x 1936 } extensions: {(null)} } ``` Is there some other way to take a full-res picture and get the raw data?