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#1
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Why does a flash cause rainbow stripes in my digital photos?
On 2014-12-11 15:26:32 +0000, "Danny D." said:
After dropping the phone down a cliff (it was either the phone or the kid I was belaying, and it wasn't an easy choice), the flash has stripes in it every time it's activated. Here's a picture snapped just now for alt.home.repair for preparing the gutters for the storm in California right now: https://c4.staticflickr.com/8/7521/1...465140f4_c.jpg The stripes seem to be in the longitudinal direction (widest): https://c4.staticflickr.com/8/7498/1...3c90f0c9_b.jpg But, the pictures are fine when I don't have a need for flash: https://c4.staticflickr.com/8/7511/1...49673dcb_b.jpg Can you give me some background on what is happening and why? If the saga of the dropped phone is a report of an actual event, then I would say that there is some internal damage to the camera and/or its circuits/processor. I doubt that what we are seeing with that first shot has anything to do with the flash, but everything to do with internal electronic damage. This raises the question; WTF were you doing with a phone while engaged in the far more important task of belaying a kid, on what we are led to believe was a climb of sorts? That seems to be the real issue here. It is a matter of cause and resulting effect. We know the cause, you dropped the phone, the resulting effect is a questionably functioning camera. My suggestion for a fix is going to depend on several factors: 1: How new is the phone? 2: Is it still under warranty, or are you carrying insurance? 3: Who is your cell service carrier? Subsequent recommendations: 1: Have the phone repaired/replaced under warranty/insurance. 2: Buy a new phone, or live with the questionable camera/phone, and don't use the flash. -- Regards, Savageduck |
#2
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Why does a flash cause rainbow stripes in my digital photos?
On 2014-12-11 16:26:29 +0000, "Danny D." said:
Savageduck wrote, on Thu, 11 Dec 2014 08:23:07 -0800: If the saga of the dropped phone is a report of an actual event, It's not. It's just that the phone is 3 years old, Samsung Galaxy S3, and it has been dropped a zillion times. But, I don't know actually *what* specifically caused the rainbow stripes. They seem to come and go, and mostly they seem to come when the battery is low (but not always). I can't be the only one on the planet with this particular problem, so, that's why I am asking around. I'm curious *what* makes those rainbow stripes, but only when the flash is operating. This seems odd, because, without flash, the pictures are fine, yet - thinking about it - the flash itself has NOTHING to do with the picture taking operation. So that's why it's weird. To me it looks like a corrupted file issue. If that is the case it is probably the damaged camera circuit writing the corrupted file only when the flash fires. If the phone is 3+ years old and you need a camera with flash, then the time has come to replace it. If the phone is functioning, and you can live without the flash, then carry on using it until it dies. -- Regards, Savageduck |
#3
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Why does a flash cause rainbow stripes in my digital photos?
On 11/12/2014 16:44, Savageduck wrote:
On 2014-12-11 16:26:29 +0000, "Danny D." said: Savageduck wrote, on Thu, 11 Dec 2014 08:23:07 -0800: If the saga of the dropped phone is a report of an actual event, It's not. It's just that the phone is 3 years old, Samsung Galaxy S3, and it has been dropped a zillion times. But, I don't know actually *what* specifically caused the rainbow stripes. They seem to come and go, and mostly they seem to come when the battery is low (but not always). I can't be the only one on the planet with this particular problem, so, that's why I am asking around. I'm curious *what* makes those rainbow stripes, but only when the flash is operating. This seems odd, because, without flash, the pictures are fine, yet - thinking about it - the flash itself has NOTHING to do with the picture taking operation. So that's why it's weird. To me it looks like a corrupted file issue. If that is the case it is probably the damaged camera circuit writing the corrupted file only when the flash fires. No. It is the analogue readout amplifier seeing some of the AC current from the circuit that steps up the flash voltage. The connector(s) or decoupling capacitor has sustained damage. If the defect pattern is reproducible it can be fixed with a dark frame subtraction but I think the OP is out of luck. Whole lines of the image are mangled to varying degrees and worse in dark conditions when the gain is right at maximum. Data corruption of a JPEG file trashes 8x8 blocks as the minimum. Usually the image is OK up to some point and then goes haywire. This was a failure in data acquisition rather than in post processing. Demosaicing did it no favours but the damage was already done by that stage. If the phone is 3+ years old and you need a camera with flash, then the time has come to replace it. If the phone is functioning, and you can live without the flash, then carry on using it until it dies. -- Regards, Martin Brown |
#4
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Why does a flash cause rainbow stripes in my digital photos?
On Thu, 11 Dec 2014 16:26:29 +0000 (UTC), Danny D. wrote:
They seem to come and go, and mostly they seem to come when the battery is low (but not always). Are they more visible in low light (at high ISO/ASA numbers) and less so in good (and lower ISO/ASA numbers)? If so, it's a light amplifier noise problem (the mono-pixel-thick lines of single colors -- R, G, or B -- are what suggest that etiology to me). HTH. Cheers, -- tlvp -- Avant de repondre, jeter la poubelle, SVP. |
#5
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Why does a flash cause rainbow stripes in my digital photos?
In article ,
Martin Brown wrote: On 11/12/2014 16:44, Savageduck wrote: On 2014-12-11 16:26:29 +0000, "Danny D." said: Savageduck wrote, on Thu, 11 Dec 2014 08:23:07 -0800: If the saga of the dropped phone is a report of an actual event, It's not. It's just that the phone is 3 years old, Samsung Galaxy S3, and it has been dropped a zillion times. But, I don't know actually *what* specifically caused the rainbow stripes. They seem to come and go, and mostly they seem to come when the battery is low (but not always). I can't be the only one on the planet with this particular problem, so, that's why I am asking around. I'm curious *what* makes those rainbow stripes, but only when the flash is operating. This seems odd, because, without flash, the pictures are fine, yet - thinking about it - the flash itself has NOTHING to do with the picture taking operation. So that's why it's weird. To me it looks like a corrupted file issue. If that is the case it is probably the damaged camera circuit writing the corrupted file only when the flash fires. No. It is the analogue readout amplifier seeing some of the AC current from the circuit that steps up the flash voltage. The connector(s) or decoupling capacitor has sustained damage. That makes sense. A freshly charged battery acts like a capacitor. I was thinking it might be a bad cell in the battery, but a damaged capacitor seems more likely to be the problem. (Perhaps it is made worse by the age of the battery?) A damaged circuit board would likely be repaired by replacement, if parts are still available for a 3 year old phone. Taking a chance on it being a defective battery could be a wast of money. Unless you have access to a phone that uses the same battery, getting another phone may be the best option. Fred |
#6
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Why does a flash cause rainbow stripes in my digital photos?
On Fri, 12 Dec 2014 19:55:52 +1100, Rod Speed wrote:
"tlvp" ... [ ... pointless babble snipped ... ] I'm not into the sort of undocumented debating you seem to enjoy. Cheers, -- tlvp. -- Avant de repondre, jeter la poubelle, SVP. |
#7
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Why does a flash cause rainbow stripes in my digital photos?
On Sat, 13 Dec 2014 15:00:30 +1100, Rod Speed wrote:
"tlvp" wrote in message ... On Fri, 12 Dec 2014 19:55:52 +1100, Rod Speed wrote: "tlvp" ... [ ... pointless babble snipped ... ] I'm not into the sort of undocumented debating you seem to enjoy. You never could bull**** and lie your way out of a wet paper bag. Exactly. Bull****ting and lying may be your way, but it ain't mine :-) . Cheers, -- tlvp -- Avant de repondre, jeter la poubelle, SVP. |
#8
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Why does a flash cause rainbow stripes in my digital photos?
On 12/12/2014 08:14, tlvp wrote:
On Thu, 11 Dec 2014 16:26:29 +0000 (UTC), Danny D. wrote: They seem to come and go, and mostly they seem to come when the battery is low (but not always). Are they more visible in low light (at high ISO/ASA numbers) and less so in good (and lower ISO/ASA numbers)? If so, it's a light amplifier noise Basically the right queation to ask and on the face of it supported by the fact that the colour ripple is much less on a white background. problem (the mono-pixel-thick lines of single colors -- R, G, or B -- are what suggest that etiology to me). HTH. Cheers, -- tlvp Agreed. The harder bit to explain is how it transpires that the readout problem can generate saturated red or blue. I hadn't really thought about how the readout was implemented on a colour Bayer array before but had always assumed that whole lines were read out and so would have expected cyan or yellow lines if an individual amplifier went bad. This primary colour linear single pixel fault tends to suggest that the array is actually read with dedicated readout for each colour component. -- Regards, Martin Brown |
#9
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Why does a flash cause rainbow stripes in my digital photos?
On 15/12/2014 09:09, Rod Speed wrote:
"Martin Brown" wrote in message ... On 12/12/2014 08:14, tlvp wrote: On Thu, 11 Dec 2014 16:26:29 +0000 (UTC), Danny D. wrote: They seem to come and go, and mostly they seem to come when the battery is low (but not always). Are they more visible in low light (at high ISO/ASA numbers) and less so in good (and lower ISO/ASA numbers)? If so, it's a light amplifier noise Basically the right queation to ask and on the face of it supported by the fact that the colour ripple is much less on a white background. problem (the mono-pixel-thick lines of single colors -- R, G, or B -- are what suggest that etiology to me). HTH. Cheers, -- tlvp Agreed. The harder bit to explain is how it transpires that the readout problem can generate saturated red or blue. I hadn't really thought about how the readout was implemented on a colour Bayer array before but had always assumed that whole lines were read out and so would have expected cyan or yellow lines if an individual amplifier went bad. This primary colour linear single pixel fault tends to suggest that the array is actually read with dedicated readout for each colour component. The lines on the first photo are a lot wider than a single pixel. How typical! You are just as clueless and wilfully ignorant as ever. -- Regards, Martin Brown |
#10
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Why does a flash cause rainbow stripes in my digital photos?
In article , Whisky-dave wrote:
Rod Speed: "tlvp" wrote in message ... "tlvp" ... [ ... pointless babble snipped ... ] tlvp: I'm not into the sort of undocumented debating you seem to enjoy. Rod Speed: You never could bull**** and lie your way out of a wet paper bag. Unlike certain others that, can lie, have, and do bull**** themselves out of many situations Of course the honest don't use those skills even if they have them. Unlike you, who bull**** and lie and never get out of any situations. -- Sandman[.net] |
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