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Thread: What is this artefact?

  1. #1
    Join Date
    May 2014

    What is this artefact?

    These are from, Lunar Orbiter Photographic Atlas of the Near Side of the Moon by Charles J Byrnes.
    Click image for larger version. 

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ID:	19505Click image for larger version. 

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    The white spots appear to cast shadows in both directions so I assume they are a by-product of cleaning and restoring the author did or its the result of a light effect.

  2. #2
    Join Date
    May 2005
    Durham NC USA
    That looks bad

    ETA: I saw from an online preview that the author (Byrne, not Byrnes) discusses many of the artifacts early in the book. Does he mention these?

    Did your copy come with a CD of images?

    O, and welcome to Cosmoquest forum!

  3. #3
    Join Date
    Jun 2008
    Wow. Not knowing what the media is - I'd say it is either a MAJOR photochemical error in the case of a film transfer or a really dreadful mag roll or photo roll issue from a xerographic machine. Close viewing shows the "shadows" or dark lines going both left and right from the white splotches which would indicate... I'm not sure.

  4. #4
    Join Date
    May 2014
    Ok, I believe it's Light Dithering. Unfortunately I don't have the book or cd, but I was able to find a database of the originals. There's 722 pages there to look through but I found 88,132,146,148,156,259,260,269,279,352,594, and 717 to be most similiar in effect but 594 is the best. It gives a neat effect. What do you think?

  5. #5
    Join Date
    Feb 2005
    I'm an expert at dithering...oh you mean for

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