White dots in 40D image processing

Gene1

• 4. Juli 2008 16:14

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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  SteveCa

  • 4. Juli 2008 17:39

  Does the dot pattern change with different shots?

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  Gene1

  • 4. Juli 2008 18:09

  [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

  • 4. Juli 2008 19:36

  Seems to be a known issue to Phase One
  http://www.phaseone.com/HOME/Content/Su ... 20-%20Main

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  Gene1

  • 4. Juli 2008 19:43

  [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

  • 5. Juli 2008 04:30

  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

  • 6. Juli 2008 18:45

  [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

  • 8. Juli 2008 12:24

  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

  • 20. Juli 2008 17:20

  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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