Results 1 to 5 of 5

Thread: What is this artefact?

  1. #1
    Join Date
    May 2014
    Posts
    2

    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. 

Name:	793c4248-a9dd-4d6c-aa42-18a17cc06b4c118.jpg 
Views:	211 
Size:	248.4 KB 
ID:	19505Click image for larger version. 

Name:	16caff99-85bb-4676-b336-9eeafeeb84fc114.jpg 
Views:	176 
Size:	247.6 KB 
ID:	19506
    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.
    Thoughts?

  2. #2
    Join Date
    May 2005
    Posts
    8,188
    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
    Posts
    2,408
    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
    Posts
    2
    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
    Posts
    11,777
    I'm an expert at dithering...oh you mean for

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •