peterv Posted September 3, 2007 Share #1 Posted September 3, 2007 Advertisement (gone after registration) Hi all, If you can't stand needles I apologise... My wife (a nurse) made a few snaps of a colleague at work this morning. M8 @ 640 ISO f4.0 1/30 I'm wondering what this pattern could be? Notice the different size pattern in the two different pictures... Thanks, Peter Link to post Share on other sites More sharing options...
Advertisement Posted September 3, 2007 Posted September 3, 2007 Hi peterv, Take a look here Different Patterns. I'm sure you'll find what you were looking for!
peterv Posted September 3, 2007 Author Share #2 Posted September 3, 2007 Anyone? Link to post Share on other sites More sharing options...
pklein Posted September 3, 2007 Share #3 Posted September 3, 2007 I see it: faint banding. Wider on the second shot. I wonder, was any electronic medical equipment nearby? Sometimes RF (Radio Frequency waves) can cause problems like this on digital cameras. If you don't see this banding on other shots taken at 640, it probably was RF interference. I briefly owned a Panasonic DMC-LC5 (Japanese version of the Digilux 1), which I quickly sent back. It did something similar whenever I used it close to my computer monitor. --Peter Link to post Share on other sites More sharing options...
peterv Posted September 3, 2007 Author Share #4 Posted September 3, 2007 Thanks for responding, Peter. There was no electronic medical equipment nearby. I'm beginning to think this was perhaps overly sharpened for an 640 ISO file in C1: 90/3... Link to post Share on other sites More sharing options...
ho_co Posted September 3, 2007 Share #5 Posted September 3, 2007 Peter-- I think I remember seeing something like this in a much earlier thread, and it turned out to be caused by the RAW converter. IIRC it was an earlier version of C1 and cleared up after the poster downloaded a later version. Was this from JPG or RAW? If RAW, processed in what converter? Can you try a different converter, or a later version of the same? Barring that--possibly the cycling of fluorescent tubes? But I don't see how that should interact with the M8's circuitry to give checkerboard patterns. With UV/IR cut filter or without? --HC Link to post Share on other sites More sharing options...
peterv Posted September 3, 2007 Author Share #6 Posted September 3, 2007 Hi, I processed again in PSE3 and in C1 (standard sharpening at 25/3) Now both files look fine... Strange... Peter Link to post Share on other sites More sharing options...
peterv Posted September 3, 2007 Author Share #7 Posted September 3, 2007 Advertisement (gone after registration) Peter--I think I remember seeing something like this in a much earlier thread, and it turned out to be caused by the RAW converter. IIRC it was an earlier version of C1 and cleared up after the poster downloaded a later version. Was this from JPG or RAW? If RAW, processed in what converter? Can you try a different converter, or a later version of the same? Barring that--possibly the cycling of fluorescent tubes? But I don't see how that should interact with the M8's circuitry to give checkerboard patterns. With UV/IR cut filter or without? --HC Hi Howard, these were done with IR on the 28 Cron, coded, lens detection on WB set for fluorescend. RAW files processed in C1 (and in PSE3, later as a reference) In C1 I did the WB again on the nurse's uniform, both the first and the second time. Link to post Share on other sites More sharing options...
peterv Posted September 3, 2007 Author Share #8 Posted September 3, 2007 Did some extra sharpening in C1: 159/3 No pattern returning, just some moire on the pants, which I think is normal for these sharpening settings. So it looks like the answer is not in the sharpening... Peter Link to post Share on other sites More sharing options...
ho_co Posted September 3, 2007 Share #9 Posted September 3, 2007 Peter-- What about the wooden cabinet in the background? It has a diagonal stripe in both series. At first I thought that was part of the checked pattern, but it's still there in the cleaned-up images, so I suppose it's part of the furniture? At least you're making progress in deciphering the anomaly, but it is definitely peculiar. --HC Link to post Share on other sites More sharing options...
delander † Posted September 3, 2007 Share #10 Posted September 3, 2007 This may be a rubbish idea but those first two images are screenshots. In PS3 I have seen these interference patterns at magnifications which are not 50 or 100%. I use a a 1600x1200 LCD. Jeff Link to post Share on other sites More sharing options...
peterv Posted September 3, 2007 Author Share #11 Posted September 3, 2007 Peter--What about the wooden cabinet in the background? It has a diagonal stripe in both series. At first I thought that was part of the checked pattern, but it's still there in the cleaned-up images, so I suppose it's part of the furniture? --HC That is right Howard, this diagonal stripe is in all the photo's, I suppose it's just the OOF texture. thanks, Peter Link to post Share on other sites More sharing options...
peterv Posted September 3, 2007 Author Share #12 Posted September 3, 2007 This may be a rubbish idea but those first two images are screenshots. In PS3 I have seen these interference patterns at magnifications which are not 50 or 100%. I use a a 1600x1200 LCD. Jeff Jeff, yes, they're screenshots. The patterns in the first two photo's where there in PSE3 and in Apple's preview... Thanks, Peter Link to post Share on other sites More sharing options...
ho_co Posted September 4, 2007 Share #13 Posted September 4, 2007 Ah, Jeff may have the answer, Peter! The pattern may simply be due to the screen technology and the image details fighting each other. Try several different enlargements on the screen and see if the problem goes away with some of them; and you might want to save a JPG at about the same size to compare, and possibly to upload. In other words, the problem may not be in the image itself, but only in the rendering of the lens on your monitor. Good insight, Jeff! I kept wondering why I was seeing the rulers and couldn't figure it out! --HC Link to post Share on other sites More sharing options...
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