Langson Posted August 17, 2020 Share #1 Posted August 17, 2020 (edited) Advertisement (gone after registration) Hi. As a new owner of a 1 year old Q-P, I have noticed some strange colour artifacts in some of my picture with soft highlight-shadow borders, and in particulary when there's skintone involved. All images shoot only raw, with ISO 100-200 and with only mechanical shutter. Anyone else got this issue? How do I best get in contact with Leica and showing them the DNGs? 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! Unedited DNGs: https://www.dropbox.com/sh/09qnt446sy4whxu/AADdC-v7-JDRaMCU97OXcqwGa?dl=0 Look for the shadow castings. Edited August 17, 2020 by Langson Quote Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! Unedited DNGs: https://www.dropbox.com/sh/09qnt446sy4whxu/AADdC-v7-JDRaMCU97OXcqwGa?dl=0 Look for the shadow castings. ' data-webShareUrl='https://www.l-camera-forum.com/topic/312413-strange-redgreen-artifacts-in-shadow-gradient/?do=findComment&comment=4028776'>More sharing options...
Advertisement Posted August 17, 2020 Posted August 17, 2020 Hi Langson, Take a look here Strange red/green artifacts in shadow gradient. I'm sure you'll find what you were looking for!
jaapv Posted August 17, 2020 Share #2 Posted August 17, 2020 Possibly Chromatic aberration in the OOF areas. Quote Link to post Share on other sites More sharing options...
Langson Posted August 17, 2020 Author Share #3 Posted August 17, 2020 Think it can be my MacBook retina screen, profile or some settings, because I can’t see the artifacts on my phone or on another computer. I noticed this when I read my post using my iPhone. Quote Link to post Share on other sites More sharing options...
jaapv Posted August 17, 2020 Share #4 Posted August 17, 2020 Retina screens are indeed not the best choice for editing images. Quote Link to post Share on other sites More sharing options...
Simone_DF Posted August 17, 2020 Share #5 Posted August 17, 2020 1 hour ago, jaapv said: Retina screens are indeed not the best choice for editing images. Out of curiosity, why? Quote Link to post Share on other sites More sharing options...
Langson Posted August 18, 2020 Author Share #6 Posted August 18, 2020 (edited) On my 6-bit display, I can't see the green-red artifacts, but on my retina display with 8-bit the green-red appears. So it's still an issue and I don't know if it's the sensor or something else. Do you see the issue I try to describe? Edited August 18, 2020 by Langson Quote Link to post Share on other sites More sharing options...
jaapv Posted August 18, 2020 Share #7 Posted August 18, 2020 Advertisement (gone after registration) @ Simone:Well, for one thing Retina displays are sRGB and not Adobe RGB and the colour rendering is not as even across the screen as dedicated screens like Eizo CG for example, making calibration less effective. The Retina screens are made for high-quality punchy viewing of the finished product. You’ll find that a screen made for editing and graphic wok renders more flat 1 Quote Link to post Share on other sites More sharing options...
jaapv Posted August 18, 2020 Share #8 Posted August 18, 2020 16 minutes ago, Langson said: On my 6-bit display, I can't see the green-red artifacts, but on my retina display with 8-bit the green-red appears. So it's still an issue and I don't know if it's the sensor or something else. Do you see the issue I try to describe? It is most unlikely to be a sensor issue. Red-green borders are normally a lens aberration with non-APO lenses but from your later description it sounds more like a monitor unable to render the colour gamut you are using. Do you see the problem on prints? If not, it has nothing to do with your camera. Quote Link to post Share on other sites More sharing options...
4peterse Posted August 18, 2020 Share #9 Posted August 18, 2020 I'm not sure if we are talking about the same issue here. I see a very slight color variation in the middle of the picture, which turns a bit greenish. I see it on the large display (calibrated, 99.9% Adobe RGB), not so much on the iPad. Which color profile do you use in the photo (camera setting), sRGB or Adobe RGB? 1 Quote Link to post Share on other sites More sharing options...
jaapv Posted August 18, 2020 Share #10 Posted August 18, 2020 36 minutes ago, 4peterse said: Which color profile do you use in the photo (camera setting), sRGB or Adobe RGB? Or,alternately what colour space do you use for raw conversion? And what colour space do you output for screen - only a small number of screens can handle Adobe RGB and even fewer -if any- Prophoto. The same for bit depth - 8-bit processing can create posterization, 16-bit output screen and printer mis matches. Quote Link to post Share on other sites More sharing options...
Langson Posted August 18, 2020 Author Share #11 Posted August 18, 2020 (edited) Raw/DNG files has no colour space/profile info. Or am I wrong? In the camera there is only settting for JPEG where you can select sRGB and Adobe RGB, and a third one. I'm using Lighroom classic and it's also here I see the issues, both in Library and Develop mode. LR is rending using Prophoto in Develop mode and AdobeRGB space in library output. I understand that my issue aren't that obvious on your screens as it's on my screen. I'll see if I can get a hold of an Eizo at the printshop and also try to print some samples. Edited August 18, 2020 by Langson Quote Link to post Share on other sites More sharing options...
Simone_DF Posted August 18, 2020 Share #12 Posted August 18, 2020 5 hours ago, jaapv said: @ Simone:Well, for one thing Retina displays are sRGB and not Adobe RGB and the colour rendering is not as even across the screen as dedicated screens like Eizo CG for example, making calibration less effective. The Retina screens are made for high-quality punchy viewing of the finished product. You’ll find that a screen made for editing and graphic wok renders more flat Well yes, I don't expect them to be as good as a dedicated Eizo for editing, but I think they are pretty good out of the box. I have calibrated mine and in general I'm satisfied with the results from my prints :-) Quote Link to post Share on other sites More sharing options...
jaapv Posted August 18, 2020 Share #13 Posted August 18, 2020 Well, TBH, the difference is indeed between good and better. Just remember to edit your images a bit "poppy" on a Retina screen to get them to display well on other screens. 1 Quote Link to post Share on other sites More sharing options...
jaapv Posted August 18, 2020 Share #14 Posted August 18, 2020 1 hour ago, Langson said: Raw/DNG files has no colour space/profile info. Or am I wrong? In the camera there is only settting for JPEG where you can select sRGB and Adobe RGB, and a third one. I'm using Lighroom classic and it's also here I see the issues, both in Library and Develop mode. LR is rending using Prophoto in Develop mode and AdobeRGB space in library output. I understand that my issue aren't that obvious on your screens as it's on my screen. I'll see if I can get a hold of an Eizo at the printshop and also try to print some samples. You are right about raw files, but LR only uses Prophoto in the background. The image displayed on your screen is most likely sRGB. The DNG is rendered to your specification for the final export. I am not quite sure, but as LR is based on the PS engine, which would mean that the whole process is LAB based. Quote Link to post Share on other sites More sharing options...
Miltz Posted August 18, 2020 Share #15 Posted August 18, 2020 There is nothing wrong with your camera. What you are seeing is 100% normal and can be seen on all digital cameras to different degrees. Just increase your color noise filter in photoshop camera raw. The shadow noise on the original Q has a green bias. That's all. 2 Quote Link to post Share on other sites More sharing options...
4peterse Posted August 18, 2020 Share #16 Posted August 18, 2020 vor 3 Minuten schrieb Miltz: There is nothing wrong with your camera. What you are seeing is 100% normal and can be seen on all digital cameras to different degrees. Just increase your color noise filter in photoshop camera raw. The shadow noise on the original Q has a green bias. That's all. That makes sense! Quote Link to post Share on other sites More sharing options...
marchyman Posted August 18, 2020 Share #17 Posted August 18, 2020 10 hours ago, jaapv said: Retina displays are sRGB and not Adobe RGB iMac retina displays have been using the the Display P3 color gamut since 2015. The differences between Display P3 and Adobe RGB are minor. Quote Link to post Share on other sites More sharing options...
jaapv Posted August 19, 2020 Share #18 Posted August 19, 2020 iMac yes. Macbook only on the top models since 2019 as far as I am aware. Quote Link to post Share on other sites More sharing options...
Langson Posted August 21, 2020 Author Share #19 Posted August 21, 2020 (edited) I isolated my issue to display calibration issue after visiting Leica center Stockholm and a professional printshop. After renting a SpyderX calibrator a new color profile was generated and it all looks good now. So I know what to wish for this Christmas! Thanks for all inputs! Edited August 21, 2020 by Langson Quote Link to post Share on other sites More sharing options...
jaapv Posted August 21, 2020 Share #20 Posted August 21, 2020 1 hour ago, Langson said: I isolated my issue to display calibration issue after visiting Leica center Stockholm and a professional printshop. After renting a SpyderX calibrator a new color profile was generated and it all looks good now. So I know what to wish for this Christmas! Thanks for all inputs! See... Quote Link to post Share on other sites More sharing options...
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