Problems with Canon CR2 raw decode in ufraw/gimp

Lennart Sorensen lsorense-1wCw9BSqJbv44Nm34jS7GywD8/FfD2ys at public.gmane.org
Tue Dec 11 19:06:24 UTC 2012


On Sun, Dec 09, 2012 at 02:00:11AM -0500, Walter Dnes wrote:
>   The disadvantage of direct JPEG shooting is that you hope and pray
> that you got everything right with the shot, because there is no
> undo/redo.  Maybe a pro can do that, but I'm a novice at the Toronto
> Digital Photo club http://torontodigitalphotoclub.com/  Among the
> advantages of feeding a raw file through the UFRAW plugin into GIMP are
> 
> * Even something as simple as cropping or re-sizing causes quality loss
>   if you have to do it in lossy JPEG format
> 
> * You can correct for over/under-exposure or wrong colour balance after
>   the fact.  This is often difficult or impossible on JPEGs.  And even
>   where you can correct, the modified image will lose detail, thanks to
>   JPEG lossiness
> 
> * Speaking of over/under-exposure, you can take *ONE* raw image, create
>   versions with diferent exposures, and create HDR images.  See
>   http://www.youtube.com/watch?v=yJFqZvmB8IE  Try doing that with a JPEG
>   photo.
> 
> * rawtherapee (or UFRAW) passes output (via pipe? IPC? whatever?) as
>   8-bit to GIMP... *AFTER* tweaking in rawtherapee (or UFRAW).  So I get
>   to choose which 8 bits of the 10/12/14/16 gets passed to GIMP.  And if
>   I don't get it right, I can always go back to the original raw file,
>   and try again
> 
> * I save my "working files" in PNG format.  They're a lot smaller than
>   uncompressed TIFF, but still lossless, unlike JPEG.
> 
> > I'll add that I've voluntarily stuck with high end point-and-shoot
> > cameras rather than moving to larger sensors and DSLRs - mainly
> > because I'm not willing to carry the extra weight and bulk of the DSLR
> > and a couple lenses.
> 
>   That's why I got the S100... near-DSLR performance in a point-n-shoot
> sized package.  Also, some sporting events, etc allow point-n-shoot
> cameras, but not "professional" cameras.  When they see a
> "point-n-click" camera hanging on a wrist strap, they'll suppress a
> giggle, and let you in.

I wonder what such people would think of my Canon Eos M.

-- 
Len Sorensen
--
The Toronto Linux Users Group.      Meetings: http://gtalug.org/
TLUG requests: Linux topics, No HTML, wrap text below 80 columns
How to UNSUBSCRIBE: http://gtalug.org/wiki/Mailing_lists





More information about the Legacy mailing list