What Tom said. Plus...
Hot pixels become more visible as exposure times lengthen: I have a
few on my DS that surface with exposure times approaching 2 seconds.
There are three solutions to hot pixels: Noise Reduction in the
camera, hot pixel removal in the RAW converter, and cloning in post-
conversion image processing. All three work very well ... cloning is
a manual process and can be time consuming, however.
Vuescan's raw conversion does not do hot pixel removal, where
Photoshop + Camera Raw does. You can see the differences in the no-NR/
NR comparison photo I posted a few weeks ago:
http://homepage.mac.com/godders/straight-NR-comp.jpg
Left-most is NR off and processed with Vuescan: it's the only one the
hot pixels are visible in.
Godfrey
On Sep 1, 2005, at 8:56 AM, Tom C wrote:
Hot pixels are photosites on the sensor that are, in layman's
terms, more sensitive to the light striking them, than average
pixels. Therefore they turn 'ON' sooner and tend to be more
visible during long exposures. Cold or dead pixels are photosites
that are always turned 'OFF'. There are also stuck pixels. These
are photosites that are always 'ON'.
From my own experience, if you don't look for them you probably
won't see them.
From: "Shel Belinkoff" <[EMAIL PROTECTED]>
I recall seeing some discussions about these things, but never
paid much
attention to them. So now that I've joined the Pixel Parade, it
might be
helpful to know what they are and if I should be concerned about
them. Are
there "cold pixels" as well?
