toke Posted November 4, 2007 Share #1 Posted November 4, 2007 Advertisement (gone after registration) Have anybody experienced tiny purple lines in their M8 photos? It looks like a pixel failure on the chip. Is this a warranty issue? Thanx in advance.... Toke Link to post Share on other sites More sharing options...
Advertisement Posted November 4, 2007 Posted November 4, 2007 Hi toke, Take a look here Purple line in photos. I'm sure you'll find what you were looking for!
etrigan63 Posted November 4, 2007 Share #2 Posted November 4, 2007 Does it happen on all photos and on all SD cards? Have to eliminate file corruption as a possible source of the line. Link to post Share on other sites More sharing options...
orjanf Posted November 4, 2007 Share #3 Posted November 4, 2007 If that line is exactly in the center of the sensor I have noticed a similar artifact on 4 out of 3000 images. Probably something to do with the fact that the ccd is read by two separate output channels I am not going to worry about it since, in the unlikely event it occurs on an image that is not crap anyway, it can be dealt with in photoshop. Link to post Share on other sites More sharing options...
Dan States Posted November 4, 2007 Share #4 Posted November 4, 2007 I've only encountered this in images that I processed into JPEG via C1 LE. When processed to TIFF the artifact was not present. How have you processed this image? Was it originally shot in RAW? Link to post Share on other sites More sharing options...
toke Posted November 4, 2007 Author Share #5 Posted November 4, 2007 I shot in RAW, converted to tiff in PS CS3. Only used one sd card. It happened on at least 3 frames..maybe more. The line is not in the center of the photos. Thanx Link to post Share on other sites More sharing options...
etrigan63 Posted November 5, 2007 Share #6 Posted November 5, 2007 Were the three photos together (in sequence) and does it happen after a certain umber of photos have been written to the card? I am trying to determine if the card has some bad bits. Link to post Share on other sites More sharing options...
howard_cummer Posted November 5, 2007 Share #7 Posted November 5, 2007 Advertisement (gone after registration) I have had a similar one-time-only experience with my replacement M8. It happened over about 10 frames, while using a much used 1GB Transcend SD card shooting in RAW. I changed the card and, thankfully, the problem went away and hasn't yet resurfaced. Hopefully it won't show up again. Howard Link to post Share on other sites More sharing options...
toke Posted November 5, 2007 Author Share #8 Posted November 5, 2007 @ Carlos I doesn't seem to be in a row. Have only used one SD card, Sandisk Ultra 2 2Gb. Don't know about the number of frames before the failure occurs. I shot a 21mm Elmarit, under flourescent light at iso 320 Toke Link to post Share on other sites More sharing options...
toke Posted November 5, 2007 Author Share #9 Posted November 5, 2007 @Howard I think my example looks like pixel problems, and not SD card problems, but I'm not sure. Hopefully SD cards won't create problems, only record mistakes/failures.... :-) Toke Link to post Share on other sites More sharing options...
marknorton Posted November 5, 2007 Share #10 Posted November 5, 2007 You've compressed the image so much that it's really tough to see it. Would be better to show a 100% crop. I doubt that SD card problems are going to show up as coherent lines in the image, especially if image is stored on the card as a JPEG. The card knows nothing about the format of the data, so the notion that data errors are going to be correlated to the image content is fanciful. Instead, you should try to identify whether it's sensor or processing. Take a set of controlled shots at different exposure levels and ISOs. Pushing the exposure in post tends to show up these types of flaws. Try using both DNG and In-camera JPEG as well as different DNG processors. Link to post Share on other sites More sharing options...
toke Posted November 5, 2007 Author Share #11 Posted November 5, 2007 Here's a 100% crop from raw file saved in jpg quality 12 Link to post Share on other sites More sharing options...
marknorton Posted November 5, 2007 Share #12 Posted November 5, 2007 Yes, clear to see but if you zoom in, it's not continuous. I think you should try to eliminate post processing as a cause... Link to post Share on other sites More sharing options...
toke Posted November 5, 2007 Author Share #13 Posted November 5, 2007 Mark Now I have tried to open it with Capture One 4.0 beta 2, and got the exact same purple line..... I´m pretty sure it's the image chip or some electronics in the M8 now. What do You think? Thanx Toke Link to post Share on other sites More sharing options...
marknorton Posted November 5, 2007 Share #14 Posted November 5, 2007 Does look that way, then, I agree. Let us know how you get on. Link to post Share on other sites More sharing options...
alex7075 Posted November 5, 2007 Share #15 Posted November 5, 2007 Strange thing. I noticed a similar line that corresponds to a bright pixel, which is not always present. I believe the line depends on the stuck pixel. So sometimes you see the white pixel, sometimes the pixel and the line, sometimes only the line, and sometimes none of them. It seems that some pixels can get stuck and go away by themselves, other will stay forever. Since the first stuck pixel came out, now I have a new one, and the first is much less bright than the time it appeared. On the LCD screen of the M8, the pixels are always visible and on underexposed pictures, the lines too. I wonder: is the sensor going to develop more and more of them (and more vertical lines), or is it just normal behavior? [ATTACH]60370[/ATTACH] Link to post Share on other sites More sharing options...
etrigan63 Posted November 6, 2007 Share #16 Posted November 6, 2007 Here's a 100% crop from raw file saved in jpg quality 12 The purple line looks like the scar from when Herr Doktor sewed the hands onto his creation... Link to post Share on other sites More sharing options...
RMF Posted November 6, 2007 Share #17 Posted November 6, 2007 It looks like the thin 'vertical line problem' . Do a search on "vertical line' in this forum and and you will see the issue discussed as well as examples. I had this problem with my first M8. NJ replaced the camera. Link to post Share on other sites More sharing options...
toke Posted November 6, 2007 Author Share #18 Posted November 6, 2007 Heard from Solms today. They will put a new image chip in the camera. Toke Link to post Share on other sites More sharing options...
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