Luminous Landscape Forum
Equipment & Techniques => iPhone and Mobile Photography => Topic started by: Guillermo Luijk on May 29, 2021, 07:42:49 pm
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I have been analysing some Apple ProRAW DNG files shared by Alessandro Michelazzi (https://products.alessandromichelazzi.com/courses/apple-proraw-free-sample-photos)
https://www.overfitting.net/2021/05/apple-proraw-lo-mejor-de-dos-mundos.html
(Google English translation available)
(https://1.bp.blogspot.com/-aEahu_loy9g/YLD51756jKI/AAAAAAAAKnk/WMunaWiNqpgMu6N1tdp_9hdw7StKfWqRgCLcBGAsYHQ/s16000/arbol512.jpg)
I have been able to check the 12-bit nature of the information (although we cannot talk about a pure equally spaced 12-bit colour depth):
(https://1.bp.blogspot.com/-omEvIb8470o/YLD6T0ArGeI/AAAAAAAAKns/cg-hiB0d2gMVe1cxaD2yR4v5yQP-DjlPwCLcBGAsYHQ/s16000/exif.png)
But I have been surprised to find out something that blowns my mind: clipped highlights in these files have lower R and B values than G, making white balance a bit more challenging and proably losing information on those two channels:
(https://1.bp.blogspot.com/-g-16opGA3TM/YLFJJzF0nnI/AAAAAAAAKn8/GKZU-g097KMzukqxWDEpu3Ak2a4eV93VQCLcBGAsYHQ/s16000/histprorawsaturaciones.png)
It seems as some white balance un-doing process is taking place in encoding the final DNG data, which sounds really weird to me. This is very uncommon in genuine RAW files where all three RGB values usually clip at the highest values of the encoding range.
(left: DNG development with no WB nor colour conversion -> clipped highlights are green. right: after WB, neutral clipped highlights become neutral again)
(https://1.bp.blogspot.com/-n_oC2znrDHI/YLLMHoTqWxI/AAAAAAAAKpQ/HdvlLC6gg5wDee4oQXCHr3-i-ABkjm2UQCLcBGAsYHQ/s16000/alineamientocanales.png)
Regards
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Is anyone using ProRAW? is anyone interested in ProRAW? is anyone interested in hybrid computational/RAW formats in smartphone photography? is anyone breathing around here? :P
Regards
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Not really using it (yet) on my new iPhone 12Pro but might. And yes, interested in the topic.
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Thanks Andrew, I thought I was preaching in the wilderness. Good to see your insights when you try it.
Regards
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Thanks Guillermo, your posts are always interesting as is this one.
I expected it would contain multiple exposures, but i guess it is only in some situations...
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Very interesting as always (and without any marketing spin). FWIW, I haven't tried yet but I'm still not sure what are the benefits from a pure RAW workflow - except speed maybe.
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I haven't tried yet but I'm still not sure what are the benefits from a pure RAW workflow - except speed maybe.
The HDR blend in high contrast scenes should outperform the capabilities of a single RAW file. That would be a nice comparison: dynamic range and detail in a RAW vs ProRAW DNG comparison.
Regards
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Sorry, I don’t usually check this section.
Yes, I do use it. Less often now but when I see a worthy scene with high contrast or tricky WB, I also take a shot in ProRAW. What I find interesting is that if I process the jpegs on the iPhone they have more flexibility and the raw doesn’t always add that much. Also the raw seems to take more post processing in Apple Photos on the iPhone, so often I do it there as as opposed to LR.
PS. Likely 5% of my shots are in ProRAW
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The HDR blend in high contrast scenes should outperform the capabilities of a single RAW file. That would be a nice comparison: dynamic range and detail in a RAW vs ProRAW DNG comparison.
Regards
Thanks for the explanation!