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zigzagler
2nd August 2010, 11:09 PM
guys,

Just wondering if any of you have the blue-ish centre spot when you use your camera? at first I thought it's temporary but it seems to be appearing on every single pictures I took!....

Booked an appointment with the genius...hopefully will get a replacement on the spot if there's any stock left.

Gotta waste my bodyguardz if it happens....

Btw, do i need to restore my phone prior to the appointment just in case they swap it on the spot?

torana355
2nd August 2010, 11:23 PM
Does the blue spot show up on your photos taken?

zigzagler
2nd August 2010, 11:29 PM
Yes unfortunately....I'm keeping my fingers' crossed that the Apple Store in Chermside has got some stock left for a swap...

torana355
2nd August 2010, 11:32 PM
Post up a photo with the blue dot for me? Im interested to see exactly what you mean.

zigzagler
2nd August 2010, 11:51 PM
http://img835.imageshack.us/img835/4338/blueishphoto.jpg

http://img839.imageshack.us/img839/1852/blueishphoto2.jpg

Check it out and you'll know what I meant.

At first I get flickering camera during the first few days over the weekend. Then the flickering sort of went away leaving the blue-ish spot at the center of the camera.

bennyling
2nd August 2010, 11:54 PM
That's just weird.

Can you see the blueish spot on your iPhone's screen, or do you have to view it on a computer screen to see the effect?

Phunky
2nd August 2010, 11:58 PM
Known issue of the ip4
Blue Spot While Taking Photos with iPhone 4 - Mac Forums (http://forums.macrumors.com/showthread.php?t=976694)
Add it to the list of problems with this new phone

bennyling
3rd August 2010, 12:07 AM
Known issue of the ip4
Blue Spot While Taking Photos with iPhone 4 - Mac Forums (http://forums.macrumors.com/showthread.php?t=976694)
Add it to the list of problems with this new phone

The plot thickens.

I can now successfully reproduce the effect - some say it's a software issue due to fluorescent lighting, but if you take a picture of anything white it's pretty noticeable (this is a letter under the fluorescent lighting of my room):

http://www.bennylingbling.com/images/skitch/IMG_0053-20100803-000520.jpg

Hmm.

I think the flickering doesn't have a whole lot to do with it - something to do with the "rolling shutter" of the iPhone's camera, but this "blue spot" thing is something new.

torana355
3rd August 2010, 12:14 AM
Yep i can make mine do that to under florescent lighting. Don't worry about it all iphone 4's will do it.

torana355
3rd August 2010, 12:20 AM
http://i203.photobucket.com/albums/aa220/torana355/photo.jpg
Yep i just got the same result under florescent lighting in my kitchen.

bennyling
3rd August 2010, 12:21 AM
Yep i can make mine do that to under florescent lighting. Don't worry about it all iphone 4's will do it.

Possibly related to the autofocus mechanism of the iPhone 4 - tried with a 3G and a 2G, no issues.

Can someone please try with a 3GS and see how they go?

Only requirements are fluoro's and a white background...

EDIT: Doesn't look like it's limited to the iPhone 4 camera:
Green Spot in Camera and Photo shot - WinMo @ MoDaCo (http://www.modaco.com/content/i8000-verizon-sch-i920-omnia-ii-http-i8000-modaco-com/302278/green-spot-in-camera-and-photo-shot/#entry1184965) (OMNIA II)

cjm
3rd August 2010, 02:57 PM
That's just not cool!!! I hadn't noticed it at all until I read this thread! Thought mine was totally fine, but no :mad:

It doesn't seem as bad as some of the images that have been posted tho :slant:

zigzagler
3rd August 2010, 03:05 PM
That's just not cool!!! I hadn't noticed it at all until I read this thread! Thought mine was totally fine, but no :mad:

It doesn't seem as bad as some of the images that have been posted tho :slant:


Any of you are going to take the risk and swap it in Apple Store? This problem seems to be everywhere...not just 1 or 2...

Secured a Genius Appointment but still contemplating whether I should go...

cjm
3rd August 2010, 03:09 PM
Any of you are going to take the risk and swap it in Apple Store? This problem seems to be everywhere...not just 1 or 2...

Secured a Genius Appointment but still contemplating whether I should go...

I really don't know. Honestly I couldn't be bothered going through with it all, and plus, how often am I really going to take pictures of white pages? Most of mine are outdoorsey pics. And so far they seem to have been fine. I'd say its just to do with low light maybe?

Edit: Just tried it again with a littttle more light and it doesn't seem to be there! Will post pics in a sec.

bennyling
3rd August 2010, 03:12 PM
I really don't know. Honestly I couldn't be bothered going through with it all, and plus, how often am I really going to take pictures of white pages? Most of mine are outdoorsey pics. And so far they seem to have been fine. I'd say its just to do with low light maybe?

A particular type of light - fluoros, to be exact.

cjm
3rd August 2010, 03:17 PM
A particular type of light - fluoros, to be exact.

Nope. Not at all.

Both pics were taken with only natural light. The only difference is the second one is a little further away.

And now that I've imported them its really not all that noticeable.

http://img683.imageshack.us/img683/8832/img0038rg.jpg


http://img819.imageshack.us/img819/1374/img0040ae.jpg

decryption
23rd August 2010, 11:34 AM
Yeah, this happens on my iPhone 4 as well... (taken in Borders - dunno what sort of light they use, I'd guess it's a fluro) - this was taken with Camera+ as well.

http://onemorething.com.au/imgdump/IMG_0011-20100823-113345.jpg

This is a photo taken under a fluro light, but I can't see it happening here:

http://onemorething.com.au/imgdump/IMG_0007-20100823-113614.jpg

wasabi
23rd August 2010, 06:11 PM
oh i just saw this on the smh.

recall iphone 4 i hope lol

DagrtheSnide
23rd August 2010, 06:26 PM
Well that's two reasons I have stopping me from buying two iPhone 4s :(

senots
23rd August 2010, 07:20 PM
I have the same blueish centre image under fluorescence office light. And taking a white paper also show a redish outer ring colour...

changa
23rd August 2010, 08:46 PM
HHmm.

Just tried taking photos with my iPhone 4 and I am also getting the blue outline in my photos too.

Would be interested to hear what the Apple Genius does and if the replacement iPhone offered actually fixes the issue.

It seems like the white balance is off, and if so, it should be able to be fixed with a software update

Li_Eon
23rd August 2010, 09:08 PM
Don't know if this is a software or hardware related problem. There's another thread regarding the issue.

http://forums.mactalk.com.au/31/90260-iphone-4-camera-problem.html

Booked an appointment at the genius bar on the weekend. See if they'll replace the phone for me.

weedwhacker
24th August 2010, 06:11 AM
This issue (color shading) is caused by the physical design of the lens and CMOS sensor in the phone. Essentially all mobile phone sensors of 2MP or more - in conjunction with a tiny wide-ish angle lens - have to deal with this issue. The "standard" way the problem is fixed is via back-end processing of the image. There's a few techniques (high-order polynomials, and piece-wise LUTs) used to solve this problem per R, G and B channel before the image is converted to JPEG or MPEG4 and stored in the camera.

It astounds me that the problem is so visible, and though the correction algorithm is in the phone (things are much worse if it isn't there:dry:), my guess would be that it wasn't properly calibrated at the factory before the phones shipped. As a general rule, thanks to small differences in sensor and lens manufacture, each camera will have a slightly different splotchy pattern and each camera requires individual calibration in the factory.

Li_Eon
24th August 2010, 08:23 PM
This issue (color shading) is caused by the physical design of the lens and CMOS sensor in the phone. Essentially all mobile phone sensors of 2MP or more - in conjunction with a tiny wide-ish angle lens - have to deal with this issue. The "standard" way the problem is fixed is via back-end processing of the image. There's a few techniques (high-order polynomials, and piece-wise LUTs) used to solve this problem per R, G and B channel before the image is converted to JPEG or MPEG4 and stored in the camera.

It astounds me that the problem is so visible, and though the correction algorithm is in the phone (things are much worse if it isn't there:dry:), my guess would be that it wasn't properly calibrated at the factory before the phones shipped. As a general rule, thanks to small differences in sensor and lens manufacture, each camera will have a slightly different splotchy pattern and each camera requires individual calibration in the factory.

By far the best and logical explanation regarding the iphone 4's camera issues :thumbup:

Li_Eon
24th August 2010, 09:18 PM
Called up Apple today and the rep agreed to give me a replacement unit when i go in on saturday. From what i've been reading, i doubt the the new IP4 will eliminate the green blot issue but im hoping at least it'll be less severe than my current IP4.

Will post a quick update regarding the new unit as soon as i can test out the camera under fluorescent lighting.

torana355
24th August 2010, 10:05 PM
Called up Apple today and the rep agreed to give me a replacement unit when i go in on saturday. From what i've been reading, i doubt the the new IP4 will eliminate the green blot issue but im hoping at least it'll be less severe than my current IP4.

Will post a quick update regarding the new unit as soon as i can test out the camera under fluorescent lighting.

Not worth it if you have no dead pixels, no yellow tinge or any other manufacturing fault. You could end up with a slightly less green tinge and dead pixels ect aswell. Even SLR's exhibit a slight green tinge in that type of lighting and they usually have a light source setting to combat it, it is a normal thing for digital cameras.

Li_Eon
24th August 2010, 10:36 PM
Not worth it if you have no dead pixels, no yellow tinge or any other manufacturing fault. You could end up with a slightly less green tinge and dead pixels ect aswell. Even SLR's exhibit a slight green tinge in that type of lighting and they usually have a light source setting to combat it, it is a normal thing for digital cameras.

That's true. I might be unfortunate enough to receive an IP4 with other manufacturing problems. My unit is perfect aside from the camera which greatly annoys me as my work environment is 99% fluorescent light. With the severity of my IP4 camera, nearly all photos i take there are unusable even after post-processing. The only solution is to convert my images to black and white :( I must say i am jealous of my friend who's IP4 isn't so badly affected by the problem :frustrating:

Here are two shots from today:

MobileMe Gallery (http://gallery.me.com/li_eon#100002/My%20Photo)

Cheers.

torana355
24th August 2010, 11:51 PM
That's true. I might be unfortunate enough to receive an IP4 with other manufacturing problems. My unit is perfect aside from the camera which greatly annoys me as my work environment is 99% fluorescent light. With the severity of my IP4 camera, nearly all photos i take there are unusable even after post-processing. The only solution is to convert my images to black and white :( I must say i am jealous of my friend who's IP4 isn't so badly affected by the problem :frustrating:

Here are two shots from today:

MobileMe Gallery (http://gallery.me.com/li_eon#100002/My%20Photo)

Cheers.

Yeah my work environment is all fluorescent aswell but ive just accepted the fact that if you want perfect shots in all lighting conditions you need to buy a decent standalone camera. The ip4 still takes brilliant shots in natural light so it still makes for a good point and shot replacement.

weedwhacker
25th August 2010, 02:55 AM
I just want to be clear that this problem should not be confused with a bad guess at white balance; the symptom of a bad white balance guess is a color cast applied to every pixel. The symptoms of uncorrected color shading are large blotches of color, frequently centered in the frame, but sometimes appearing on the left and right of a rectangular frame.

There's plenty of published (http://www.faqs.org/patents/app/20100054588) algorithms (http://www.faqs.org/patents/app/20100110241) out there to correct this problem, and I'd be astounded if this particular camera doesn't have the hardware/software required to do so, but it's likely disabled or mis-calibrated.

bennyling
25th August 2010, 09:36 AM
I henceforth nominate weedwhacker as the highest quality poster of this forum. Two posts to his name and stunning brilliance in every one.

Well done mate :thumbup:

Li_Eon
25th August 2010, 07:50 PM
Funny how this problem has existed since the very beginning.

Notice in the video, when the user switches over to the rear-camera, you can clearly see the green tint and pink outer frame on the cameras.

I think this was the very first hands-on video with FaceTime on the iphone 4 during the revealing of the phone.

YouTube - iphone 4 hands on (http://www.youtube.com/watch?v=c5KzC_zPzGY&feature=related)