LotharZhou Posted June 5, 2010 Share #1 Posted June 5, 2010 Advertisement (gone after registration) In the last two days I found out a strange vertical line on my photos, not hot pixel or dead pixel, it's a strange one pixel wide line roughly in the center of the picture, not cross the whole frame, It's very hard to spot but I definitely found on low ISO of every picture, mostly visible on sharp and high contrast areas, black text on paper for example. The pixel wide line kind of smears the high contrast areas. Not visible at all in blurred area or bokeh area. I doubt it was the dead pixel in the beginning, after take shots up to ISO2500 in the darkness I couldn't find any vertical lines at all, only appears in low ISO sharp areas. Does anyone have idea what's the reason that cause this artifact? Thanks very much for any information, btw this M8 had just came back from Solms for sensor cleaning in March. one picture is showing the line smeared the text in the red fame, another one is showing the line right next to the red vertical line, 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/123004-strange-vertical-artifact-any-idea/?do=findComment&comment=1344447'>More sharing options...
Advertisement Posted June 5, 2010 Posted June 5, 2010 Hi LotharZhou, Take a look here Strange vertical artifact, any idea?. I'm sure you'll find what you were looking for!
gravastar Posted June 6, 2010 Share #2 Posted June 6, 2010 .......................Does anyone have idea what's the reason that cause this artifact? Thanks very much for any information, btw this M8 had just came back from Solms for sensor cleaning in March....one picture is showing the line smeared the text in the red fame, ...another one is showing the line right next to the red vertical line, I'll hazard a guess but could be quite wrong. I wonder if the sensor has had a vertical column defect that's been mapped out by Leica and the blurring is a result of adjacent column pixels being used to fill in the missing information? Bob. Link to post Share on other sites More sharing options...
LotharZhou Posted June 6, 2010 Author Share #3 Posted June 6, 2010 Thanks a lot, i had the same feeling in the beginning, then I tracked back some of photos I took one year ago, seems the line was already there, also it seems doesn't show up on JPG. I can't explain this. I'll hazard a guess but could be quite wrong. I wonder if the sensor has had a vertical column defect that's been mapped out by Leica and the blurring is a result of adjacent column pixels being used to fill in the missing information? Bob. Link to post Share on other sites More sharing options...
gravastar Posted June 6, 2010 Share #4 Posted June 6, 2010 ..................seems the line was already there, also it seems doesn't show up on JPG. I can't explain this. It may not show up on jpegs since jpeg compression is lossy. I don't think Leica use the the "lossless" version even in the "fine" mode. For more information see here. Compression is not on a pixel by pixel basis but, for example, by various transformations on a 8x8 matrix of pixels. Bob. Link to post Share on other sites More sharing options...
dpattinson Posted June 6, 2010 Share #5 Posted June 6, 2010 If it's exactly in the middle, then it could be an example of the original 'vertical line problem'? IIRC that was an issue caused by the way the signal from the two halves of the sensor was read out, and was a/the cause of the initial recall of the camera. (I may be wrong here, doubtless there are other forum members who know more about this particular issue). My camera exhibited a similar line, quite visible on high iso shots, until it was returned to Solms and 'fixed'. I suggest taking some high-iso (2500) shots of neutral targets to see if you can reproduce it the whole way down the sensor. Link to post Share on other sites More sharing options...
Guest roey Posted June 6, 2010 Share #6 Posted June 6, 2010 Looks very similar to the problem I encountered earlier this year: thread I sent the camera to Leica. They replaced the sensor. Link to post Share on other sites More sharing options...
LotharZhou Posted June 6, 2010 Author Share #7 Posted June 6, 2010 Advertisement (gone after registration) Thank you, it looks exactly the same, just mine isn't so obvious in the beginning. Looks very similar to the problem I encountered earlier this year: thread I sent the camera to Leica. They replaced the sensor. Link to post Share on other sites More sharing options...
perb Posted June 6, 2010 Share #8 Posted June 6, 2010 Looks very similar to the problem I encountered earlier this year: thread I sent the camera to Leica. They replaced the sensor. ...and I saw you posting in this S2 thread as well: http://www.l-camera-forum.com/leica-forum/leica-s2-forum/112897-s2-vacation-pointnshoot-gallery.html#post1198263 So it is a "Kodak thing" then, and Leica gets the pain for it. The M8 has it (I have seen it in images from my M8), the M9 can have it and also the S2. "There is no escape" Regards Per Link to post Share on other sites More sharing options...
fursan Posted August 12, 2010 Share #9 Posted August 12, 2010 I am sorry you are having the problem. I truly am. Hope you sort it out soon. Link to post Share on other sites More sharing options...
jaapv Posted August 12, 2010 Share #10 Posted August 12, 2010 Let's rule out simple explanations. It is not a (cleaning) smear on the sensor? Link to post Share on other sites More sharing options...
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