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<blockquote data-quote="Horoscope Fish" data-source="post: 714411" data-attributes="member: 13090">It would help, I think, to be able to review a full resolution version of the image but in looking at your posted .jpg in Photoshop I'm not seeing the, &quot;weird geometric circular pattern&quot; you describe. What I do see, however, are what appear to be moiré patterns. Some of the strongest moiré I found was immediately adjacent to what I'm guessing is the doorway of the observatory(?), near the bottom of the image toward the left edge. If that's what you're talking about, I can only hope someone has a suggestion for preventing it from happening in the first place because removing moiré patterns is a stone-cold b--ch in my experience; usually involving a process of adding noise, and or a blur filter, to the image in an attempt to hide the patterns. The only thing I can think of that might help, and it's a mighty stretch, would be processing in 16-bit mode, which assumes you're not already doing that. Another possibility is the issue lies with the color gamut you're processing in (eg. ProPhoto vs. aRBG vs. sRGB); but that's another stab in the dark.</blockquote>

[QUOTE="Horoscope Fish, post: 714411, member: 13090"] It would help, I think, to be able to review a full resolution version of the image but in looking at your posted .jpg in Photoshop I'm not seeing the, "weird geometric circular pattern" you describe. What I [U]do[/U] see, however, are what appear to be moiré patterns. Some of the strongest moiré I found was immediately adjacent to what I'm guessing is the doorway of the observatory(?), near the bottom of the image toward the left edge. If that's what you're talking about, I can only hope someone has a suggestion for preventing it from happening in the first place because removing moiré patterns is a stone-cold b--ch in my experience; usually involving a process of [I]adding[/I] noise, and or a blur filter, to the image in an attempt to hide the patterns. The only thing I can think of that might help, and it's a mighty stretch, would be processing in 16-bit mode, which assumes you're not already doing that. Another possibility is the issue lies with the color gamut you're processing in (eg. ProPhoto vs. aRBG vs. sRGB); but that's another stab in the dark. [/QUOTE]

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