Thank you for explanation!
On Wed, 2018-05-02 at 22:27 +0200, Tobias Ellinghaus wrote:
> Am Mittwoch, 2. Mai 2018, 16:06:32 CEST schrieb Timur Irikovich
> Davletshin:
> > Is this cut-off area camera dependent, fixed or certain algorithm
> > to
> > detect border errors is applied?
>
> It's camera dependent.
>
> > On Wed, 2018-05-02 at 16:00 +0200, Tobias Ellinghaus wrote:
> > > Am Dienstag, 1. Mai 2018, 20:55:20 CEST schrieb Timur Irikovich
> > >
> > > Davletshin:
> > > > Question just out of my natural curiosity. Just noticed that
> > > > darktable
> > > > always produces pictures that are 30-50 pixels smaller when
> > > > exporting
> > > > from DNG than from camera Raw file. And even more, they never
> > > > match
> > > > claimed camera resolution. Biggest difference is on EOS 5D Mark
> > > > III.
> > > >
> > > > E.g. It claims 5920x3950 in DT image information but exported
> > > > picture
> > > > is (from CR2) 5794x3868 and (from DNG) 5760x3840. Nikon files
> > > > show
> > > > the
> > > > same.
> > > >
> > > > At least in case of Adobe's converted files there is some logic
> > > > that
> > > > they always match builtin JPGs in size.
> > > >
> > > > Remember I disabled all default modules (just 'original' in
> > > > history
> > > > stack), DNGs produced from Raw are not demosaiced (latest
> > > > version
> > > > of
> > > > Adobe's tool with default settings).
> > >
> > > No idea what Adobe does to the DNG files, but at least camera raw
> > > files have
> > > (in general) some black borders and otherwise broken areas at the
> > > edges that
> > > we cut off. Therefore the exported image size doesn't match the
> > > raw
> > > file size
> > > 1:1. Camera JPEGs are a little smaller as they try to adhere to
> > > the
> > > advertised
> > > aspect ratio and probably cut off more to err on the safe side
> > > (and
> > > make the
> > > in-camera processing easier).
> > >
> > > > Did I miss something?
> > > >
> > > > Thanks for explanation in advance,
> > > >
> > > > Timur.
> > >
> > > Tobias
> >
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>
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