Différence de cadrage - RAW et Jpeg

[jpverrue]

Il y a eu une discussion sur ce sujet précis ces derniers jours sur la liste de diffusion darktable-users. Il semble que l'auteur de la question aie trouvé un contournement, si ce n'est la solution au problème. Voici l'ensemble des échanges

P-s. Le fichier mentionné est facilement modifiable.

Hello,

http://lclevy.free.fr/cr2/
For EOS 500D (alias EOS Rebel Kiss X3):

Sensor width / height : 4832 x 3204
Left and top border: 72   31
4832 - 72 = 4760
3204 - 31 = 3173

So replacing this line in rawspeed/data/camera.xml (EOS 500D)
<Crop x="62" y="30" width="4722" height="3142"/>

with this one:
<Crop x="72" y="31" width="4760" height="3173"/>
fixed the issue.

----------------------------------------
From: Jeepeii Jagesh <jeepeii@mailfence.com>
Sent: Sat Jul 07 18:02:56 CEST 2018
To: Timur Irikovich Davletshin <timur.davletshin@gmail.com>, <darktable-user@lists.darktable.org>
Subject: Re: [darktable-user] CR2 cropped compared to JPEG


Thanks Timur,

In the case of EOS 500D, the camera JPEG is wider than RAW.
I've try few software displaying CR2 file correctly:
rawtherapee
nufRaw
geeqie
digicam
aftershot
photivo
I'd like to understand the issue with darktable.
Would be great to fix this.

Jeepei

----------------------------------------
From: Timur Irikovich Davletshin <timur.davletshin@gmail.com>
Sent: Sat Jul 07 07:50:54 CEST 2018
To: <darktable-user@lists.darktable.org>
Subject: Re: [darktable-user] CR2 cropped compared to JPEG


On Fri, 2018-07-06 at 23:57 +0200, Jeepeii Jagesh wrote:

Hello,

I use a Canon EOS 500D, shot in RAW + JPEG.
https://we.tl/11IDm9G2Yh
In lighttable, the files display the same resolution 4752 x 3168.
Opening the CR2 image in darkroom, it goes to 4832 x 3204. 
But it's cropped, down and right by + -30px. 
On Rawtherapee I don't have the problem.
How can that be fixed?

Thanks
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I've addressed similar issue not so long ago, so here is what I've got
as reply:

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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