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White dots in 40D image processing

Gene1
I get weird one pixel white dots in shadow areas under the following circumstances:

I turn noise chroma and luminance noise reduction off. I lower the exposure. Then out of nowhere these white dots appear.

below are 100% crops @ ISO 640

Here is normal exposure with noise reduction off:

http://www.pbase.com/gaocus/image/99660090/original.jpg

Here it is with exposure control lowered and white dots

http://www.pbase.com/gaocus/image/99660095/original.jpg

Here it is with exposure jacked up.

http://www.pbase.com/gaocus/image/99660093/original.jpg

These were at ISO 640 and it gets worse at higher ISO.

Anybody else see this? Any ideas?
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Comments

8 comments

Date Votes
  • SteveCa
    Does the dot pattern change with different shots?
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  • Gene1
    [quote="SteveCa" wrote:
    Does the dot pattern change with different shots?


    Yes it does. Some other shot at same ISO slightly underexposed don't exhibit any white dots when I do the same processing - turning all C1 noise reduction off and turning down the exposure control.

    Gene
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  • Paul Steunebrink
    Seems to be a known issue to Phase One
    http://www.phaseone.com/HOME/Content/Su ... 20-%20Main
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  • Gene1
    [quote="Paul Steunebrink" wrote:
    Seems to be a known issue to Phase One
    http://www.phaseone.com/HOME/Content/Su ... 20-%20Main


    Thanks. Apparently happens in windows as well as macs ☹️
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  • edb1
    I saw this problem with my Olympus E510, but it only occurred in C1, not in the output JPG picture.
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  • Gene1
    [quote="edb" wrote:
    I saw this problem with my Olympus E510, but it only occurred in C1, not in the output JPG picture.


    It appeared in my output.

    Gene
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  • spaze
    Anything that solves this go-around way of handling this bug? Are we totally left alone with this or is PhaseOne doing something about it?
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  • Permanently deleted user
    My OS is WIN XP.
    The image in question was taken with a Nikon D80 to NEF. ISO 800.
    Opened in CO4.
    Using Auto - Exposure resulted in value -0,07...
    and some black areas turning full of 'stars'.
    Did not spot this at once - but later in CS3, when the TIFF was opened.
    Started to cry (this is the second bug within the first 14 days with CO4) but managed to search here ;O)
    Read the work-around 'ID 1173'.
    All white spots were removed with Luminance value 2.

    But of course, PHASE ONE ! - work-arounds which depends on needless justifying are not satisfying. I would like to hear from a PO-person, that this 'erroneous function' will be removed from CO4 as soon as possible - together with the sharpening bug, mentioned elsewhere in this forum.

    Kind regards,
    Eigil
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