Photo: Some facts after a quick analysis of both +HTC  #ONEm9   and +LG Mobile Global  #LGG4  produced DNG.

- Both lack flat-field correction
- Both provide incomplete matrix-only color profiling: no DCP
- Neither use compression
- HTC One M9 DNG is 10 bit stored in 16bit uncompressed data: 39MB per 20 Mpixel image.
- LG G4 DNG is 10 bit stored uncompressed, 20MB per 16 Mpixel image
- Both have non-optimal noise profiling settings: HTC One M9 set noise reduction too high and LG G4 lacks noise profiling entierly.

Notes on flat-field correction:
Mobile camera modules require such correction to correct both vignetting and color cast (like pink spot / greenish or blueish corners).
HTC One M9 requires less correction than the LG G4.
It is only possible to compensate for light fall-off, in RAW image editors, not color cast.
As a result, the color cast in corners is essentially non-fixable.

Attached: the #LGG4  DNG sample provided by +Colby Brown rendered in Lightroom with only modification an increased contrast and exposure slightly, to make both vignetting and color cast more obvious.

The least I can say is that there's room for improvement, both DNG implementation being non-optimized and incomplete.

#supercurioBlog   #LG   #DNG   #color   #camera   #calibration  
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François Simond
Public
Some facts after a quick analysis of both +HTC  #ONEm9   and +LG Mobile Global  #LGG4  produced DNG.

- Both lack flat-field correction
- Both provide incomplete matrix-only color profiling: no DCP
- Neither use compression
- HTC One M9 DNG is 10 bit stored in 16bit uncompressed data: 39MB per 20 Mpixel image.
- LG G4 DNG is 10 bit stored uncompressed, 20MB per 16 Mpixel image
- Both have non-optimal noise profiling settings: HTC One M9 set noise reduction too high and LG G4 lacks noise profiling entierly.

Notes on flat-field correction:
Mobile camera modules require such correction to correct both vignetting and color cast (like pink spot / greenish or blueish corners).
HTC One M9 requires less correction than the LG G4.
It is only possible to compensate for light fall-off, in RAW image editors, not color cast.
As a result, the color cast in corners is essentially non-fixable.

Attached: the #LGG4  DNG sample provided by +Colby Brown rendered in Lightroom with only modification an increased contrast and exposure slightly, to make both vignetting and color cast more obvious.

The least I can say is that there's room for improvement, both DNG implementation being non-optimized and incomplete.

#supercurioBlog   #LG   #DNG   #color   #camera   #calibration  

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