Hi,
I uploaded some Photos for comparison here:
http://www.bilddateien.de/transfer/
From that it appears to me that jpg from camera and jpg
from Nikon's ViewNX give the same, but smaller image size
than the raw.
Export from darktable equals the image size of the raw as
reported from ViewNX.
-Bernhard-
David Vincent-Jones schrieb am 26.08.2013 19:26:
The more that I look at this the more confusing it becomes;
Geeqie has a different size reading from the exif raw data.
UFraw has another totally larger size in both dimensions.
I now suspect this is simply a matter of how clipping is performed in
the raw conversion. I am however surprised that the jpg and raw in dt do
not 'match'.
David
On 13-08-26 09:59 AM, David Vincent-Jones wrote:
Hi Jo;
The sizes are correct as stated and read directly off the dt image info.
The jpg file is larger by 10 lines and if I compare views at 100% I can
actually see the lost edge on the raw file.
David
On 13-08-26 01:22 AM, johannes hanika wrote:
On Sun, Aug 25, 2013 at 1:10 AM, David Vincent-Jones
<davi...@frontier.com>wrote:
I was trying to compare values in imported jpg and raw files and notice
that when I exported both as jpg format they appear to be of differing
size.
JPG size ... 4752 x 3168
RAW size ... 4752 x 3158
if you mean the other way around it's normal. the raw is a bit bigger than
the jpg. it has some 10-100 px in width and height more, to estimate black
levels and to do easy on-chip spatial filtering i would assume. the black
pixels we usually cut away very early (in rawspeed for example) and some of
the others are actually useful pixels if you go through the pain and make
your algorithms aware of the borders.
-jo
Looking at the files in dt this difference is also seen. Is this a Canon
camera 'feature' or is this something in the dt system?
David
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