agreenspan Posted August 31, 2009 Share #1 Posted August 31, 2009 Advertisement (gone after registration) Hi. Can anyone please tell me what these rainbow-like maze artifacts are on the shingles in this photo. It only appears on this photo, where the shingles are in focus. I used the M8u Is this moire? Thanks, Stephen. Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/95110-what-in-the-world-is-this/?do=findComment&comment=1012882'>More sharing options...
Advertisement Posted August 31, 2009 Posted August 31, 2009 Hi agreenspan, Take a look here What in the world is this?. I'm sure you'll find what you were looking for!
stunsworth Posted August 31, 2009 Share #2 Posted August 31, 2009 It's moire. Link to post Share on other sites More sharing options...
Guest WPalank Posted August 31, 2009 Share #3 Posted August 31, 2009 Is this moire? Yes. Link to post Share on other sites More sharing options...
agreenspan Posted September 1, 2009 Author Share #4 Posted September 1, 2009 Oh, so that's what it looks like. Anything I can do about it (not that this pic is important - just wondering). Link to post Share on other sites More sharing options...
Guest WPalank Posted September 1, 2009 Share #5 Posted September 1, 2009 Oh, so that's what it looks like. Anything I can do about it (not that this pic is important - just wondering). I posted two techniques buried in this thread. http://www.l-camera-forum.com/leica-forum/leica-m8-forum/44433-unreal-city.html Others will tell you to use Capture One which has an anti-moire filter. Link to post Share on other sites More sharing options...
KM-25 Posted September 1, 2009 Share #6 Posted September 1, 2009 Yeeeaaah...I am not so sure this is just moire. I would get this in things like backlit water, high contrast areas, lots of places. C-1 helped, but not totally. I ended up having to re-shoot a commercial job once because we just could not get rid of it, and it was a fairly neutral area like this one is. Bring on the M9..... Link to post Share on other sites More sharing options...
haroldp Posted September 1, 2009 Share #7 Posted September 1, 2009 Advertisement (gone after registration) The M9 may or may not not make any difference depending on it's pixel count and sensor size. Aliasing artifacts like moire are a result of the combination of bayer interpolation, and the lens out resolving the sensor, which is why you only see it in the plane of focus. Anti-aliasing filters effectively reduce the resolution of the lens to eliminate this problem. Leica's design choice ( which I approve of ) was to get maximum resolution most of the time, and deal with artifacts in software. This mostly works, but occasionally as you found out, software just is not enough. If software solutions were perfect, than no-one would use AA filters. Most digicams don't use them because their tiny sensors have 2-3 micron pixel pitch, and their lenses simply cannot resolve inside that. If the M9 is FF and uses the same pixel size as the M8, ( hence the speculation at 18 mp), there will be no difference in resistance to artifacts except possibly in the corners where reduced resolution and contrast may have an impact. One of the benefits of greater pixel density ( more sensor resolution ) is that the threshold for interpolation artifacts is reduced, or a less aggressive AA filter can be used (by those who use them), increasing sharpness. I realize that this is a simplification of a very complex subject, but I hope it is useful. Regards to alll ... Harold Link to post Share on other sites More sharing options...
gwelland Posted September 1, 2009 Share #8 Posted September 1, 2009 This is not just Moire. I've seen similar artifacts as part of the demosaic algorithms with raw converters. The looping shapes at the pixel resolution are reminiscent of some problems both ACR and Aperture had with files in the (distant) past. What converter did you use for this? Link to post Share on other sites More sharing options...
sandymc Posted September 1, 2009 Share #9 Posted September 1, 2009 This is not just Moire. I've seen similar artifacts as part of the demosaic algorithms with raw converters. The looping shapes at the pixel resolution are reminiscent of some problems both ACR and Aperture had with files in the (distant) past. Graham is right; while there may well be moire in there, at least part of what you're seeing is a maze pattern from the raw converter. The maze pattern may be being triggered by moire in the original image, but you may well get significantly better results from a different raw converter. Sandy Link to post Share on other sites More sharing options...
agreenspan Posted September 1, 2009 Author Share #10 Posted September 1, 2009 I use aperture (the latest version), with the standard M8 conversion that it comes with. This picture was shot raw. Stephen. Link to post Share on other sites More sharing options...
adan Posted September 1, 2009 Share #11 Posted September 1, 2009 Right - the maze-like patterns are luminance interpretation faults subsequent to a moire pattern, the color rainbows are a chrominance moire effect. The Nikon D70, which had improved sharpness over the D100 (less intense AA filter), also showed the maze effects (in jpegs - so it is an overall de-Bayerizing fault, caused or avoided by whatever software converts the image to a full rgb image - in-camera or in post-processing) Nikon D70 Review: 17. Photographic tests: Digital Photography Review Usually, I only get mazes in strong reds, like car taillights or traffic stop signals, where there is also an underlying fresnel lens pattern molded into the red plastic of the lights - usually. Link to post Share on other sites More sharing options...
lct Posted September 1, 2009 Share #12 Posted September 1, 2009 ...The Nikon D70, which had improved sharpness over the D100 (less intense AA filter), also showed the maze effects (in jpegs.... ... and raws as well. Link to post Share on other sites More sharing options...
ennjott Posted September 1, 2009 Share #13 Posted September 1, 2009 I had much stronger patterns of this kind in a few shots from my 5D2, so it can happen even with a (weak) AA filter. Link to post Share on other sites More sharing options...
jaapv Posted September 1, 2009 Share #14 Posted September 1, 2009 There is a thread by Nicoleica with exactly this problem. ACR is specifically prone to it with M8 DNGs, Aperture better and it usually disappears in C1 ( 4.8.1 and higher) http://www.l-camera-forum.com/leica-forum/digital-post-processing-forum/83842-confusing-colours.html Link to post Share on other sites More sharing options...
Dan States Posted September 1, 2009 Share #15 Posted September 1, 2009 Agreed, C1 is much better at controlling this and also blooming and red flare. There is a reason why it's the default convertor for Leica. Best wishes Dan Link to post Share on other sites More sharing options...
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