Nattering Nabob of Nullity or perspicacious pragmatist, Moose writes:
<<So many exposure control aids, histograms, flashing lights, zebras, etc., are
derived from the JPEG that one becomes suspicious. Yup, I use them, and they
are useful, but not entirely reliable.
It is odd that this has not been corrected in firmware. It clearly can be
done! There is a way to tweak the settings for Sonnie that Zebras closely
parallel the raw files, but it isn't perfect. CHDK and Magic Lantern (hacked
firmware) allowed RGB or luminance histo/zebras based on raw data for several
years now.
Last I checked only the red dot company allowed for that. As I've learned the
hard way as well as cautionary advice from Moose, a color channel (esp red
flowers) can easily be clipped with a normal looking luminance histo or zebra.
R = Y + 1.403V' One can clip at V=127, i.e. at Y=77 (only 30% brightness).
Green channel more difficult to saturate, so I have read.
Custom button to set raw RGB zebra on half press would solve the issue, Mike
--
_________________________________________________________________
Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
Archives: http://lists.thomasclausen.net/mailman/private/olympus/
Themed Olympus Photo Exhibition: http://www.tope.nl/
|