CCD dust imaging

Alan Browne writes:
p.110 of Maxxum 7D manual: "The DiMAGE Master software can remove the
affects of dust from RAW images. This is done by taking a dust
reference image before cleaning the CCD. For more on this process, see
the DiMAGE Master manual."

-has anyone tried this?

-do other cameras (Canon, Nikon...) have this feature?

Yeah, Canons have a 'sensor clean' in their menu.

It's clever math for dealing with pixels darkened by the presence of
dust. Or it applies a median filter to selected "dark" pixels to
future images.

--
Todd H.
http://www.toddh.net/

Todd H. wrote:

Alan Browne writes:

p.110 of Maxxum 7D manual: "The DiMAGE Master software can remove the
affects of dust from RAW images. This is done by taking a dust
reference image before cleaning the CCD. For more on this process, see
the DiMAGE Master manual."

-has anyone tried this?

-do other cameras (Canon, Nikon...) have this feature?


Yeah, Canons have a 'sensor clean' in their menu.

It's clever math for dealing with pixels darkened by the presence of
dust. Or it applies a median filter to selected "dark" pixels to
future images.

I'm not so sure that it's so 'clever', kind of a neat thing to do (and a
responsible OEM thing to do for the camera owners).

I'm really wondering: has anyone used it and how were the results?

Cheers,
Alan

--
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-- [SI] gallery & rulz: http://www.pbase.com/shootin
-- e-meil: there's no such thing as a FreeLunch.

"Alan Browne" wrote in message
...
I'm not so sure that it's so 'clever', kind of a neat thing to do (and a
responsible OEM thing to do for the camera owners).

I'm really wondering: has anyone used it and how were the results?

Cheers,
Alan
---------------
I tried it (for testing purposes only) using my D70 and it works.
The procedure is take a dust reference picture of a blank sheet of paper
at a small aperture (f22 in my test). There were at least 3 very visible
dust specks and several less visible specks.
A "dust reference" option is selected in the camera and a unique file
extension name designator is given to the reference picture. I immediately
took second picture of the blank paper in the normal shooting mode.
The next step is to load the "normal" picture in the Nikon Capture
software and then apply the dust removal option. The dust specks were then
removed with no trace at all of the offending dust specks.
I manually removed the dust specks and I don't normally shoot at f22 so I
don't have a dust problem in normal shooting. I assume the process would
work as well with normal picture content vs.: a blank sheet of paper.
Regards,
Don F

Todd H. wrote:
Alan Browne writes:
p.110 of Maxxum 7D manual: "The DiMAGE Master software can remove the
affects of dust from RAW images. This is done by taking a dust

-do other cameras (Canon, Nikon...) have this feature?

Yeah, Canons have a 'sensor clean' in their menu.

Which --- at least in the 20D --- flips up the mirror and
opens the shutter so you can clean the sensor. :-)

There may or may not be a way to hide the dust using the Canon PC
software.

-Wolfgang

Don Farias wrote:

"Alan Browne" wrote in message
...

I'm not so sure that it's so 'clever', kind of a neat thing to do (and a
responsible OEM thing to do for the camera owners).

I'm really wondering: has anyone used it and how were the results?

Cheers,
Alan

---------------
I tried it (for testing purposes only) using my D70 and it works.
The procedure is take a dust reference picture of a blank sheet of paper
at a small aperture (f22 in my test). There were at least 3 very visible
dust specks and several less visible specks.
A "dust reference" option is selected in the camera and a unique file
extension name designator is given to the reference picture. I immediately
took second picture of the blank paper in the normal shooting mode.
The next step is to load the "normal" picture in the Nikon Capture
software and then apply the dust removal option. The dust specks were then
removed with no trace at all of the offending dust specks.
I manually removed the dust specks and I don't normally shoot at f22 so I
don't have a dust problem in normal shooting. I assume the process would
work as well with normal picture content vs.: a blank sheet of paper.


Thanks.
Cheers,
Alan

--
-- r.p.e.35mm user resource: http://www.aliasimages.com/rpe35mmur.htm
-- r.p.d.slr-systems: http://www.aliasimages.com/rpdslrsysur.htm
-- [SI] gallery & rulz: http://www.pbase.com/shootin
-- e-meil: there's no such thing as a FreeLunch.

In article sdewd.3167$Qk5.1508@lakeread04,
Don Farias wrote:

I manually removed the dust specks and I don't normally shoot at f22 so I
don't have a dust problem in normal shooting. I assume the process would
work as well with normal picture content vs.: a blank sheet of paper.
Regards,
Don F

That's a very big assumption. Could you tell if your image of the sheet
of paper was too soft? If it were missing detail in those areas? What
if there was a linear feature (an edge, or a thin line) running across
the speck?

In article , (Todd H.) wrote:

Yeah, Canons have a 'sensor clean' in their menu.

It's clever math for dealing with pixels darkened by the presence of
dust. Or it applies a median filter to selected "dark" pixels to
future images.

HAHAHAHAHAHA
It's just a camera setting that flips up the mirror and opens the
shutter, so you can reach the sensor; nothing more...sorry....

Olympus is the only camera manufacturer so far that offers a real
solution to the dust problem.

Lourens

"John Francis" wrote in message
...
In article sdewd.3167$Qk5.1508@lakeread04,
That's a very big assumption. Could you tell if your image of the sheet
of paper was too soft? If it were missing detail in those areas? What
if there was a linear feature (an edge, or a thin line) running across
the speck?
--------------------
What I am saying (albeit indirectly) is that dust specks on my sensor
have never been a real problem for me in 10 months of shooting. Picture
content varies and I normally crop and print 8 X 10s.
I did take a few shots (with "normal" detail) with a known dirty sensor
and found it difficult to find any visible problem with shots a f8 and f11.
Shooting a clear blue sky at f22 is a problem. (Using "auto contrast" in
PhotoShop amplifies the dust problem if there is any doubt of it's
existence.)
Bottom line ... it makes much more sense to me to clean a dirty sensor
rather than go through a cumbersome procedure to mask the problem.
Regards,
Don F