jpk Posted June 23, 2013 Share #1 Posted June 23, 2013 Advertisement (gone after registration) I have a very strange grid in files with noise which becomes more visible if I apply heavy noise reduction (see attachement). I guess this is the result from the in-camera lens correction... Is this true? If yes: is it possible to switch off this kind of processing without loosing the lens info in the EXIFs? 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/207374-noise-lens-correction-pattern/?do=findComment&comment=2356375'>More sharing options...
Advertisement Posted June 23, 2013 Posted June 23, 2013 Hi jpk, Take a look here Noise - lens correction pattern?. I'm sure you'll find what you were looking for!
mjh Posted June 23, 2013 Share #2 Posted June 23, 2013 I guess this is the result from the in-camera lens correction... Is this true? No, I don’t think so. The corrections applied in-camera wouldn’t have this effect. (Which camera, btw? And do you see this in JPEGs or DNGs?) Link to post Share on other sites More sharing options...
tobey bilek Posted June 23, 2013 Share #3 Posted June 23, 2013 Turn off the lens recognition by coding and then you will know. Link to post Share on other sites More sharing options...
jpk Posted June 24, 2013 Author Share #4 Posted June 24, 2013 No, I don’t think so. The corrections applied in-camera wouldn’t have this effect. (Which camera, btw? And do you see this in JPEGs or DNGs?) DNGs from the Monochrom, processed in LR5! Link to post Share on other sites More sharing options...
jaapv Posted June 24, 2013 Share #5 Posted June 24, 2013 But first turn off the default capture sharpening. Link to post Share on other sites More sharing options...
jpk Posted June 24, 2013 Author Share #6 Posted June 24, 2013 I turned off lens correction in the MM and took some test shots with ISO 8000. In LR4.4 and LR5 the pictures did not show any grid pattern (DNGs without any sharpening / noise-reduction). But after I rotated the pictures (+1,18) the grid appeared! And it's not only on screen, it's also visible in the exported TIFFs. So a Lightroom bug? Link to post Share on other sites More sharing options...
jaapv Posted June 24, 2013 Share #7 Posted June 24, 2013 Advertisement (gone after registration) Possibly. Link to post Share on other sites More sharing options...
CheshireCat Posted June 25, 2013 Share #8 Posted June 25, 2013 Can we see a normal image showing this issue ? i.e. not a TV on an empty channel Link to post Share on other sites More sharing options...
Shade Posted June 25, 2013 Share #9 Posted June 25, 2013 Lightroom has been known to have some slight issues when processing datas from cameras. I have a pattern when they process my FUJI RAF files and I have NO idea why. Link to post Share on other sites More sharing options...
jpk Posted June 25, 2013 Author Share #10 Posted June 25, 2013 The sample in my first post is a crop from this picture. But the problem exists in every picture with noise as soon as I rotate it with the crop / rotate tool. The same hapens if I export a TIFF and rotate it in Photoshop - with or without prior noise reduction. So it seems it has to do with noise, but not with noise reduction... 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/207374-noise-lens-correction-pattern/?do=findComment&comment=2358014'>More sharing options...
Shade Posted June 25, 2013 Share #11 Posted June 25, 2013 Have you tried processing your RAW / TIFF files with a different software and convert them to JPEGs and then process them in lightroom? Does the problem persist? Link to post Share on other sites More sharing options...
250swb Posted June 25, 2013 Share #12 Posted June 25, 2013 .....with ISO 8000. This may be your problem, especially if you are also using a lot of noise reduction in Lightroom. The image file will be screaming in pain. Steve Link to post Share on other sites More sharing options...
jaapv Posted June 25, 2013 Share #13 Posted June 25, 2013 I have a niggling feeling of having seen this problem before as a LR bug. It is clear that rotating an image in LR applies some extensive processing that does affect the image at a pixel level. See the post by LRuser24 in this discussion: Lightroom 4.1 RC2: Artefacts when using shadows, clarity and image warp (lens corrections) Link to post Share on other sites More sharing options...
pico Posted June 25, 2013 Share #14 Posted June 25, 2013 I agree with Jaap. Since the pattern appears only after rotation, then it is caused by rotation. Incidentally, your correction of about 1.5 degrees is very much like my common error in framing. The error began to occur, perhaps by coincidence, when I switched to tri-focal glasses. Link to post Share on other sites More sharing options...
MirekE Posted June 25, 2013 Share #15 Posted June 25, 2013 Did you try changing order of the processing steps? For example, if you apply noise reduction first and then rotate the image, rotate it first and apply noise reduction later? Link to post Share on other sites More sharing options...
jpk Posted June 25, 2013 Author Share #16 Posted June 25, 2013 Thanks for your input! I tried processing with and without NR, with NR before and after rotating, and also with different software (RAWtherapee) - it always shows the grid pattern after rotating. I even checked if files from other cameras show the same grid pattern after rotating - and they do! The result is: files with heavy noise show grid patterns after rotating regardless which software is used. The process of rotating itself seems to introduce the grid patterns... Strange that I couldn't find any related information through Google! The remainig question: what is the solution? Link to post Share on other sites More sharing options...
CheshireCat Posted June 26, 2013 Share #17 Posted June 26, 2013 Did you try changing order of the processing steps? For example, if you apply noise reduction first and then rotate the image, rotate it first and apply noise reduction later? I am afraid this is not possible, as Lr applies processing operators in a fixed order that makes sense (e.g. denoise first, then rotate). Link to post Share on other sites More sharing options...
CheshireCat Posted June 26, 2013 Share #18 Posted June 26, 2013 The sample in my first post is a crop from this picture. But the problem exists in every picture with noise as soon as I rotate it with the crop / rotate tool. The same hapens if I export a TIFF and rotate it in Photoshop - with or without prior noise reduction. So it seems it has to do with noise, but not with noise reduction... Could you also post the same shot before rotation ? Link to post Share on other sites More sharing options...
jaapv Posted June 26, 2013 Share #19 Posted June 26, 2013 I am afraid this is not possible, as Lr applies processing operators in a fixed order that makes sense (e.g. denoise first, then rotate). Yes, but it is no problem in Photohop CS which uses the same algorithms. Link to post Share on other sites More sharing options...
CheshireCat Posted June 27, 2013 Share #20 Posted June 27, 2013 Yes, but it is no problem in Photohop CS which uses the same algorithms. Uhm... not so sure it is the same. In any case, the OP says that the same happens in PS if he exports TIFF. The only explanation I have is that the MM sensor noise patterns create some sort of Moiré interference with rotation algorithms. Check also here, first picture is self explanatory: http://en.wikipedia.org/wiki/Moir%C3%A9_pattern Link to post Share on other sites More sharing options...
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