[astrange]

There is no consumer software that can do what the iPhone does with its sensors.

iPhone HDR produces an HDR image file. Consumer HDR apps do the opposite - they take an HDR raw and tone map an sRGB JPEG out of it.

The only portable format that really supports HDR images is EXR, so if you're not generating that you're not getting it.

(I don't think there's anything that can do deep fusion either, though obviously you need it a lot less.)

[_aavaa_]

I don't think that's true. Capture One introduced HDR merging in one of their recent releases [0].

It does raw in "raw" out. You get a DNG out which is demosaiced. I have not yet looked to see what it's doing under the hood, and how the result compares to EXR. (But in my experience, it seems to struggle with large exposure differences, even when on a tripod).

[0]: https://support.captureone.com/hc/en-us/articles/44100147302...

[astrange]

I mean, sure, producing another raw is one way to do it, but I wouldn't really call that an image format.

[_aavaa_]

I have no idea why you wouldn’t call it an imagine format.

But either way that’s changing the goal posts. Here is a consumer software doing what that iPhone does.

If that’s not to your liking, there is other software which produces 32bit float tiff images, those will support an even higher dynamic without the pain of EXR.

[buildbot]

You are all over this thread trying to prove that iPhones somehow have a unique setup in the industry that no other camera can match, and people keep telling you how wrong you are. DNG is 100% and image format, and can be “raw” or completely processed depending on the layers internally. Educate yourself before making such blanket statements.

[astrange]

I know what a DNG is. It's not a final delivery format; it's not compressed and I don't think eg gaming content pipelines are going to accept it for ingest either.

(Also, macOS won't display them in HDR, but will display EXR files in HDR. Some trivia for you.)

[buildbot]

-> It's not a final delivery format

linear DNG?

-> it's not compressed

"Lossless and lossy compression (optional): DNG support optional lossless and (since version 1.4) also lossy compression.[36] The lossy compression losses are practically imperceptible in real world images"

-> I don't think eg gaming content pipelines

Why is this a goalpost even??? In what context? Photogrammetry? DNG works just fine.... Or the actual engine itself? found one in 30 seconds of searching: https://github.com/EQMG/Acid

-> macOS won't display them in HDR

Well, that seems like a macOS problem

This is ridiculous at this point.

[_aavaa_]

I actually now agree with them. I think they were simply doing a bad job explaining.

What I think they mean is that the iPhone camera app is the only one that takes an HDR photo of a scene a produces and HDR output image[0] that can be easily shared and viewed IN HDR on multiple devices.

I don't think that EXR is a particularly portable format (do phones even support viewing them in their native photo viewer/manager?) nor one with small file sizes.

The DNGs from Capture One or Lightroom have similar issues, they at least can be viewed on phones, but they do not show up as HDR images.

Other applications, e.g. Hugin, will produce and SDR image. It's based on an HDR image so it captures a wider dynamic range, but it does it through tone mapping back into a SDR image, rather than actually saving and showing the full dynamic range of the HDR image.

[0] I am not convinced that what the iPhone does with their heic images is really HDR, in the sense that the colors still seem to be stored in an SDR range.

[_aavaa_]

After this comment I get where you’re coming from.

Do you consider the heic files from an iPhone hdr files rather than sdr, even though the extra brightness channel is stored as a separate channel rather than extending the range of rgb values?

[sorenjan]

Hugin produces exr files from image stacks.

[buildbot]

Sure, there’s not a photoshop button, but does github count https://github.com/timothybrooks/hdr-plus

It’s just an algorithm.

[illiac786]

> iPhone HDR produces an HDR image file

What file format is this? iPhone produces tone mapped HEIC, yes, but that’s not HDR as you pointed out.

Or do you mean HDR video?

[astrange]

No, the HEIC has a proprietary attachment with the HDR data as well. You can see the iPhone display adapting when you view it in Photos.

[_aavaa_]

Do you have any info on how that attachment is stored/accesssed?

[illiac786]

I think I found it:

https://github.com/m13253/heif-hdrgainmap-decode

[_aavaa_]

Thanks! I'll take a look

[aoeusnth1]

Capture One creates .dng files, which are HDR raw equivalents when combining hdr from bracketed RAWs.

[pizza]

How about JPEG XL?