iPhone 14 Pro sensor question
Mar 4, 2024 08:32:07 #
a6k
Loc: Detroit & Sanibel
I looked at a DNG raw file from it with RawDigger and noticed it appears to be 16 bit. It has values up to 2^16. My Sony maxes out at 2^14.
What is actually going on here?
What is actually going on here?
Mar 4, 2024 09:00:02 #
a6k wrote:
I looked at a DNG raw file from it with RawDigger and noticed it appears to be 16 bit. It has values up to 2^16. My Sony maxes out at 2^14.
What is actually going on here?
What is actually going on here?
If the DNG you looked at was an Apple Pro raw file then it wasn't a raw file. Apple Pro raw isn't raw. It's a processed and demosaiced linear DNG.
Mar 4, 2024 09:17:12 #
I switchet to JPG in settings because I don't like Apple's format. When I shoot true raw I use my Cannon R6.
Mar 4, 2024 09:52:49 #
a6k
Loc: Detroit & Sanibel
Edawsoni wrote:
If the DNG you looked at was an Apple Pro raw file then it wasn't a raw file. Apple Pro raw isn't raw. It's a processed and demosaiced linear DNG.
I won't debate the assertion that the file is not a raw file. But RawDigger will not, it says, open a non-raw file. For example, it won't open a JPG or a TIF/TIFF.
It will open an Adobe DNG, it says.
More importantly, how then to explain the maximum value?
Mar 4, 2024 09:53:32 #
a6k
Loc: Detroit & Sanibel
bobbydvideo wrote:
I switchet to JPG in settings because I don't like Apple's format. When I shoot true raw I use my Cannon R6.
Thank for your opinion but it's really not what I asked.
Mar 4, 2024 09:57:52 #
a6k wrote:
I won't debate the assertion that the file is not a raw file. But RawDigger will not, it says, open a non-raw file. For example, it won't open a JPG or a TIF/TIFF.
More importantly, how then to explain the maximum value?
More importantly, how then to explain the maximum value?
RawDigger will open a DNG including a linear DNG which does not contain raw data. Apple Pro raw is not raw.
https://kirkville.com/apples-new-proraw-photo-format-is-neither-pro-nor-raw/
https://discussions.apple.com/thread/254714624?sortBy=best
Mar 4, 2024 10:18:50 #
a6k
Loc: Detroit & Sanibel
a6k wrote:
I looked at a DNG raw file from it with RawDigger and noticed it appears to be 16 bit. It has values up to 2^16. My Sony maxes out at 2^14.
What is actually going on here?
What is actually going on here?
I used MacOSX Preview app to view EXIF. It says 16.
Mar 4, 2024 11:00:31 #
a6k wrote:
I used MacOSX Preview app to view EXIF. It says 16.
It's a 16 bit lossy compressed RGB image in a DNG wrapper. There's nothing raw about it.
https://kirkville.com/apples-new-proraw-photo-format-is-neither-pro-nor-raw/
Mar 4, 2024 11:20:42 #
Mar 4, 2024 11:37:10 #
a6k wrote:
I used MacOSX Preview app to view EXIF. It says 16.
Here's some more info: https://dprevived.com/t/full-field-mtf-of-the-48mp-camera-of-iphone-14-pro/2043/
"In the Pi V3, the four pixels of the same color in each Quad are not binned directly in some modes: they are read at different times, like in exposure bracketing. Stacking is performed on-sensor, producing a single HDR pixel out of the four. This is the way that a Pi engineer put it for the V3.
The V3 gains about 2 bits of dynamic range this way, so if we generously assume that the Pro 14's sensor produces 12 real bits out of the ADC, we could get 14 bits at 12MP out of the sensor after tone mapping. Normalizing this to 16 bits provides additional precision in order to perform the other operations discussed earlier to produce the RGB DNG file (wb, demosaicing etc.)."
I bolded two critical sections of the above quote from the article. Pro raw is a linear DNG that contains no raw data. The ADC in the camera is 12 bit.
Mar 4, 2024 11:47:14 #
TriX wrote:
Apple ProRAW and Adobe DNG are different formats.
From the Wikipedia article you referenced: "DNG is both a raw image format and a format that supports "non-raw", or partly processed, images.[2] The latter (non-raw) format is known as 'Linear DNG'."
A Linear DNG contains no raw data.
Mar 4, 2024 11:48:12 #
TriX wrote:
Apple ProRAW and Adobe DNG are different formats.
An Apple Pro raw file is an Adobe compatible Linear DNG.
Mar 4, 2024 12:23:08 #
Edawsoni wrote:
An Apple Pro raw file is an Adobe compatible Linear DNG.
I agree - I was commenting because it seemed that the classic (raw) DNG file was being confused with Apple Pro raw
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