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
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