250swb Posted July 12, 2016 Share #21 Posted July 12, 2016 Advertisement (gone after registration) Is the image 8 bit Greyscale? That would be a good explanation of the banding. Only ever work with16 bit RGB for B&W. Steve Link to post Share on other sites More sharing options...
Advertisement Posted July 12, 2016 Posted July 12, 2016 Hi 250swb, Take a look here How can Leica not seeing it?. I'm sure you'll find what you were looking for!
Giulio Zanni Posted July 12, 2016 Author Share #22 Posted July 12, 2016 Is the image 8 bit Greyscale? That would be a good explanation of the banding. Only ever work with16 bit RGB for B&W. Steve No is 16 bit RGB Link to post Share on other sites More sharing options...
Giulio Zanni Posted July 31, 2016 Author Share #23 Posted July 31, 2016 I keep on seeing substantial banding in the sky but Leica is not acknowledging it. I don't know what to do...Here is another example straight out of the camera 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/262090-how-can-leica-not-seeing-it/?do=findComment&comment=3088656'>More sharing options...
pico Posted July 31, 2016 Share #24 Posted July 31, 2016 Show the banding with software enhancements if you can. We all cannot see it. . Link to post Share on other sites More sharing options...
Trivette Posted August 1, 2016 Share #25 Posted August 1, 2016 I see it. It's very subtle. Link to post Share on other sites More sharing options...
250swb Posted August 1, 2016 Share #26 Posted August 1, 2016 I can see banding on the first picture in the thread but not this latest photo. Link to post Share on other sites More sharing options...
edwardkaraa Posted August 1, 2016 Share #27 Posted August 1, 2016 Advertisement (gone after registration) I doubt that the camera is responsible for these kind of artifacts. They look to me like some kind of compression side effects, or the monitor profile. My Sony A7 did this to blue skies as well, and it was shown to me on the Sony forum what causes this (not the camera), which was a mixture of compression, heavy correction of vignetting, and other stuff I can't remember. Link to post Share on other sites More sharing options...
jaapv Posted August 1, 2016 Share #28 Posted August 1, 2016 Give us a DNG to work on. Link to post Share on other sites More sharing options...
Giulio Zanni Posted August 1, 2016 Author Share #29 Posted August 1, 2016 I doubt that the camera is responsible for these kind of artifacts. They look to me like some kind of compression side effects, or the monitor profile. My Sony A7 did this to blue skies as well, and it was shown to me on the Sony forum what causes this (not the camera), which was a mixture of compression, heavy correction of vignetting, and other stuff I can't remember. I shoot DNG no compression and I see it on both my computers, including a calibrated Eizo display. I think I have this problem mainly with one camera, but I cannot do comparison as the other body is Wetzlar since three months for a blocked shutter. Jaap I sent you a PM Link to post Share on other sites More sharing options...
Guest Posted August 1, 2016 Share #30 Posted August 1, 2016 Two suggestions ... 1) try C1 on the DNG. 2) add a moderate amount of fine grain .... I have downloaded the JPG file you show and do not see banding on my calibrated 5K monitor .... even with exaggerated curves in CS PS. There were a number of artifacts introduced in Adobe products when the automatic lens corrections were applied ... do not know if that is an issue here. Bob Link to post Share on other sites More sharing options...
250swb Posted August 2, 2016 Share #31 Posted August 2, 2016 After all this going round the houses to think of a cause what about looking at the initial exposure? The images may all be normally exposed and the dark brooding theme is all done in post processing, but alternatively if the original file is vastly under exposed to get that effect perhaps that is where the compression (for want of a better description) is occurring, and then it is exaggerated when the image has some post processing applied? Steve Link to post Share on other sites More sharing options...
Giulio Zanni Posted August 2, 2016 Author Share #32 Posted August 2, 2016 After all this going round the houses to think of a cause what about looking at the initial exposure? The images may all be normally exposed and the dark brooding theme is all done in post processing, but alternatively if the original file is vastly under exposed to get that effect perhaps that is where the compression (for want of a better description) is occurring, and then it is exaggerated when the image has some post processing applied? Steve When exposing I always look at the histogram, as much as possible to the right without burning highlights Link to post Share on other sites More sharing options...
Belle123 Posted August 2, 2016 Share #33 Posted August 2, 2016 I keep on seeing substantial banding in the sky but Leica is not acknowledging it. I don't know what to do...Here is another example straight out of the camera I carefully looked all around this photo and see no banding. But I do see lots of specs which means your sensor is dirty. Could you be confusing that with banding? Link to post Share on other sites More sharing options...
Giulio Zanni Posted August 3, 2016 Author Share #34 Posted August 3, 2016 I carefully looked all around this photo and see no banding. But I do see lots of specs which means your sensor is dirty. Could you be confusing that with banding? Unfortunately I can distinguish a dirty sensor from banding. Yes my sensor is dirty and as I photograph these kind of subjects at around f11 that is even more visible, but that's not a big deal. Link to post Share on other sites More sharing options...
jaapv Posted August 3, 2016 Share #35 Posted August 3, 2016 Just a thought - I will have a look at the files this weekend - but did you check yoour SD card. Some cards are sensitive to power fluctuations, and that can vary slightly between cameras. Link to post Share on other sites More sharing options...
Giulio Zanni Posted August 3, 2016 Author Share #36 Posted August 3, 2016 Just a thought - I will have a look at the files this weekend - but did you check yoour SD card. Some cards are sensitive to power fluctuations, and that can vary slightly between cameras. No I haven't tried to change the card (it's a 64GB Lexar gold), I will try to change the card at the next shoot. The problem shows up only with flat skies. Link to post Share on other sites More sharing options...
Belle123 Posted August 3, 2016 Share #37 Posted August 3, 2016 Unfortunately I can distinguish a dirty sensor from banding. Yes my sensor is dirty and as I photograph these kind of subjects at around f11 that is even more visible, but that's not a big deal. Well, maybe the sky isn't totally flat and empty in terms of value. The sensor is so sensitive, picks up all variances and any kind of atmosphere is maybe you think is banding. It sees more than our eyes pick up. I suggest testing the problem on a blank wall instead of the sky. The camera can't distinguish between a sky and a blank wall, so if there is a problem it would show up there. Link to post Share on other sites More sharing options...
Giulio Zanni Posted August 3, 2016 Author Share #38 Posted August 3, 2016 Well, maybe the sky isn't totally flat and empty in terms of value. The sensor is so sensitive, picks up all variances and any kind of atmosphere is maybe you think is banding. It sees more than our eyes pick up. I suggest testing the problem on a blank wall instead of the sky. The camera can't distinguish between a sky and a blank wall, so if there is a problem it would show up there. Are concentric circles sort of rainbow effect, they are not in the sky Link to post Share on other sites More sharing options...
Stealth3kpl Posted August 3, 2016 Share #39 Posted August 3, 2016 Well, maybe the sky isn't totally flat and empty in terms of value. The sensor is so sensitive, picks up all variances and any kind of atmosphere is maybe you think is banding. It sees more than our eyes pick up. I suggest testing the problem on a blank wall instead of the sky. The camera can't distinguish between a sky and a blank wall, so if there is a problem it would show up there. The problem only occurs with one of his Monochroms, and we can see the banding evident in the first image posted. He tells us it is present in the DNG which is imported and processed in exactly the way as files from his other Monochrom. There is no issue with the other I believe. Pete Link to post Share on other sites More sharing options...
pechelman Posted August 3, 2016 Share #40 Posted August 3, 2016 No is 16 bit RGB I really dont know much about these things, but would something be happening in a bit up-conversion since the monochrom files are 12-bit? The only time I've seen banding from my 246 is due to compression. I'm probably of no help. Good luck to you and I'll be keeping an eye on this for any discoveries. Link to post Share on other sites More sharing options...
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