If you have identified hot pixels, a simplistic action that can
automatically clone most of them out is easy to create.
- Make an exposure of a medium gray field at a setting to exacerbate
the gray pixels, or use an existing exposure which shows them clearly.
- Open the file in Photoshop and start recording an action.
- Choose the clone tool, set it to be a small size just larger than
the hot pixel
- For each hot pixel, pick a source point close by and then clone it
onto the hot pixel.
- Once you've finished cloning all the hot pixels, close the action
recording.
Hot pixels don't move, so you can automate removal on an arbitrary
number of files by putting all your affected JPEG images (before
cropping!) into a folder, call "File->Automate->Batch..." in
Photoshop, tell it which action and which folder to work on. It will
open every file in the folder and auto-clone out the hot pixels. This
is about 95% effective ... sometimes a few get dabbed with something
that you have to clean up later but most are gone.
The other thing to do is to be sure that Noise Reduction is turned on
in the camera for when you're recording JPEG format and using longish
exposure times, at least with the DS (don't know about the D or other
models in this regard). NR will do dark frame subtraction and a
healthy degree of hot pixel removal for you automatically.
Godfrey
On Mar 30, 2006, at 1:19 PM, Bruce Dayton wrote:
Generally speaking they don't get worse. Some pixels may be weaker
than others and show up at high ISO and/or long exposures. If you
aren't seeing it with your camera and settings, then you probably
won't in the future.
Seems like I remember somewhere a plug or action or something that
could mask those out relatively automatically - once you indicated the
location(s). Perhaps someone will have better recall than me.
--
Best regards,
Bruce
Thursday, March 30, 2006, 12:17:00 PM, you wrote:
AR> Unfortunately, shooting RAW is just not an option because of
AR> how quickly I need to turn over jpegs.
AR> But am I right in thinking that if I am not seeing them now
they will not develop later?
AR> -Aaron
AR> -----Original Message-----
AR> From: Powell Hargrave <[EMAIL PROTECTED]>
AR> Subj: Re: Why dustproblems ? (WasRE: *ist D vs DS2, some
questions)
AR> Date: Thu Mar 30, 2006 1:28 pm
AR> Size: 403 bytes
AR> To: [email protected]
AR> At 08:29 AM 30/03/2006 , Aaron wrote:
So does that mean it's permanent and that no one knows where they
come from?
AR> Sensor was made that way. Most hot pixels are mapped out in
the firmware
AR> but a few week/hotter pixels tend to sneak through and show up
with longer
AR> exposures and higher ISO's.
AR> Shoot RAW and use PSCS Camera RAW. Hot pixels are magically
gone. One
AR> more reason to shoot RAW.
AR> Powell
