yashsingh1/xdaforums huggingface dataset:
[Galaxy S II General] godutch:
But I was thinking the sgs1 has a pentile matrix, so it's fuzzy by nature whereas the sgs2 has a rgb matrix, so the same sharpness filters would affect the sgs2 more than the sgs1
[Galaxy S II General] jvidia:
The banding on gradients you are talking is this?

The batery and USB logos should have this gradient scale or should they have a smooth gradient? :confused:
[Galaxy S II General] mur76:
maybe its just 16bit vs 32 bit color or some other software issue, try one of the excellent themes in the them forum, see what you get
[Galaxy S II General] jvidia:
What theme? what forum :confused:
[Galaxy S II General] mur76:
try this, very colourful, see if you notice it here,

http://xdaforums.com/showthread.php?t=1068020
[Galaxy S II General] kdub1987:
try downloading the particle live wallpaper, absolutely awful banding
[Galaxy S II General] Blue1k:
Ya I know about that but the point was a software fix should easily fix this like it did wp7.

Man I totally forgot about xorg.conf LOL

So many hours spent setting a new shiny Linux distro
[Galaxy S II General] Anemovatis:
I would like to thank the poster of this Thread.

I am a graphics designer and I noticed the banding a few minutes after my SGSII did the first boot (while checking out live wallpapers).

At that time I thought that this is the unfortunate limitation of an AMOLED screen.

Because in order to achieve higher color depths the LEDs need to refresh at very high speeds (approx. 800Mhz or more) and that is probably out of the question for the battery we have.

But here comes dithering to save the day. With a good algorithm you can steal a few cycles from the CPU and a few milliseconds of the display response time and improve the perceivable colors by more than 60%.

So i am hoping that Samsung is really trying to do just that...
[Galaxy S II General] jvidia:
I've just seen the Angry Birds 1 on a Galaxy S1 and it is almost a non-banding device.

Tested also on my S2 with an black and white photo (with a lot of grays) and in the Album Gallery it looks horrible!

Do you guys think seriouslly that this problem will be resolved ?

I'm thinking on selling mt S2 :(
[Galaxy S II General] simacca:
Has a faint circular banding on the black background on my SGS2.

Edit : I always thought this was a Pentile Matrix problem. Obviously not!
[Galaxy S II General] mur76:
it could be just the type of screen, please wait for sgs2 specific themes, or newer games, angry birds could just be 16bit colours, to reduce the lag which was present early on, which blend on older devices, but the Clarity of SA+ shows these up.

try tests with games from the games hub for example.
[Galaxy S II General] briko78:
Hi,

have you tried unchecking

Settings -> Display -> Automatic Display Performance

And changing to

Settings -> Display -> Background Effect -> Dynamic???

Might help!

Bye briko78
[Galaxy S II General] kaukassus:
I tried it out, but the banding was still as heavy as before.
[Galaxy S II General] jvidia:
we have to wait for the 2.3.4 and see if it is solved :s

Nexus S also had this (as I read on the net) and was solved by 2.3.3 only.
[Galaxy S II General] opencube:
Ive noticed this on mine. More so on screens with solid grey back grounds.

I have uploaded a photo I took of my S2 screen with a solid grey image on screen.

I have also uploaded a version with green guides overlaid so its easier to pick out the 'streaks' that I am seeing.

its difficult to get on camera, and is more noticeable in 'real life'.

Is this the same problem everyone else is having or is mine different?
[Galaxy S II General] jvidia:
Your problem looks more like ghosting/burn-in.

There are more people complaining with even worst ghosting/burn-in than you. In mine S2 that is almost non present.

I still don't understand how it is possible to sell a suposed SUPER MEGA HIPER screen tecnology that looks like this.

Branding on gradients is posted on the 1st post of this topic: http://xdaforums.com/showthread.php?t=1075364

Also sucks .... I can by one 120/150€ smartphone (ex: San Francisco/LG P500) that doesn't suffer from this!
[Galaxy S II General] r_a_c:
No, that is not color banding. This should be an even colored picture huh?

Color banding is when going from one gradient of blue(for example) to another one without it being smooth. But you see the line between them.

I even saw banding in the os of the sgs2, like when i plugged the phone in and turned it off, the battery icon on the screen is pretty ugly, alot of banding, the picture is not good! Also some of the keys of the dialer suffer from gradient banding... or did they want it to look metallic?

What you have, I don't know what is causing it. Maybe burn in. Maybe some line of pixels that isn't capable of having the exact same color as their surrounding pixels... Or maybe slower to gain the exact color.

But don't worry I had the same problem, where these vertical lines where interupting my image. Harder to see in other colors huh?

There is alot wrong with the screens of the sgs2, too bad...
[Galaxy S II General] jvidia:
In this burn-in/ghosting/bad pixel what's the solution? Return the phone?

Did you return yours?
[Galaxy S II General] OisteinR:
...or wait for SGS3
[Galaxy S II General] jvidia:
:eek: that's insane mate.

Don't wan't to think that.
[Galaxy S II General] opencube:
What could be burning it in though? I do a whole mixture of things with my phone and not for long either, so doubt anything can be burned in.

A friend of mine tested these different grey images on his phone and he has similar appear on his.

Here is a link to the solid grey images

May be worth you testing these on your S2s to see if you can spot this streaking effect?
[Galaxy S II General] Stitch!:
I have some line two, best noticable in the grey one. Both black an white images dont show anything... I kinda hate you for pointing this out... :P
[Galaxy S II General] r_a_c:
Yes I returned mine, but especially for the yellow/darker left side of the screen.

But I also had this problem, along with some other screen problems.

Like 1 stuck/dead pixel.

Some temporary burn in, that i noticed when i typed a long message in my bed(very dark) and than opened the pull down menu, i still saw the countoures(spelling?) of the keypad...

Also the grey bar of the pull down menu, where your thumb, or another finger you use to pull it down is on. The pixels seemed to need some time to adjust to another color(the grey from the bar) because i could see countoures in the small bar from what was on the screen there before, like on the home page, the icons at the bottom, i could see the square countoures in that bar... And disappeared after 15-20 seconds. Seems like the pixels need to adjust.

For a screen that should be " the best screen available now" it does have alot of flaws...

Or do we just have defected ones? I don't think so, just people that don't notice such things.
[Galaxy S II General] doh:
I too have the "streaking" effect mentioned, but i noticed that if you turn up screen brightness to max, it seems to dissipate mostly. Checked it on the images above.
[Galaxy S II General] MALmen64:
Could this be why the Galaxy S2 score such much better than the HTC Sensation? Because of crippled graphics quality? (i also have noticed the heave banding in all sorts of applications)
[Galaxy S II General] jvidia:
Do you think Samsung is aware of this ?
[Galaxy S II General] anantn:
Does the latest KE8 firmware upgrade, fix the banding glitch?
[Galaxy S II General] SkullDeath:
^ It still exists with KE8. I'm going through the reviews for this phone again and I could not find anything regarding the banding at all :confused:
[Galaxy S II General] anantn:
Blatant Bribery...or mayhap a bug that exists only in the indian version? Checking with someone with an international handset, would give us a better idea.
[Galaxy S II General] biffsmash:
Well I just looked at a pic in the Quickpic application and it had some banding on the walls in the background of the pic, so I ticked the option to force 32bit in the app settings and the banding in the pic was gone, so I'm guessing it's simply software issue. It's not something I notice much anyway so i'm not fussed, but i'm sure it can be sorted.
[Galaxy S II General] simacca:
Thanks for the Quickpic tip. Much faster than the stock photo viewer :)
[Galaxy S II General] simacca:
I just tested your images on mine and can't really see any streaking effect. I think i'm one of the lucky ones :)
[Galaxy S II General] 6ITdtvFQqY:
I've converted some photos taken with a Canon 40D, in aRGB color space, at 1600 * 1600 pixels, copied them on the device and looked at them with both "Gallery" and "QuickPic" (with and without the option to force 32 bit decode, which made no difference). The background mode is set to "Standard".

Simply put, the photos look mind-boggling, far better than they look on my (hardware-calibrated) professional NEC 2690 WUXi2 display. The black level is absolutely stunning, giving images realism / definition.

(If the photos are converted to sRGB, as JPEGs normally are, you have to set the background mode to "Movie".)

Firmware: KE2
[Galaxy S II General] deanwray:
tbh, everyone that thinks there is a fault with software , if you download my gradient app (loads of posts back) and set the brightness of your phone to full, you should only really be able to detect faint banding on green, as I said b4 this is normal. When anyone says its a software problem, you can see it in app-x, well actually is probably a development choice. Devs can set colour and limit it to 5bit 6bit 5bit, instead of 8,8,8 for performance.

The other issues when brightness is really low is to my knowledge a characteristic of amoled at low contrast.

So Amoled+ not as good at display of 565 android colour than other phones, but amoled+ does a nice job at medium high brightness and 888 etc

Not really seen anything yet to make me think there are banding problems with software or hardware, I only look and think, oo dev set that to low colour.

Just my thoughts again :) But if ne1 does reallly think they have it and use my app on high brightness and can post RAW (uncompressed) (properly exposed) image some place I would look to do a test app to investigate further.
[Galaxy S II General] godutch:
I have another theory: that samsung uses a sharpening filter (called mdnie) which is set for pentile amoled screens but someone a bit more knowledgeable should look in the source (someone should check kernel/drivers/video/samsung)

furthermore android have a setting in build.prop to enable surface dithering but adding this setting does nothing:

persist.sys.use_dithering = true
[Galaxy S II General] jvidia:
I'm a little down to earth (you are too tecnical for me :D ) .... I only ask is why the battery logo and usb logo are way worst than in the Galaxy S1? Also why for instance the Angry Birds 1 & Rio have worst gradients (look @ the background walls in the levels and the front boxes in the hangar on the 1st levels) than in the S1?

I expected at least equal IQ.

Does passing from 4" to 4.3" with the same resolution is also an explination?
[Galaxy S II General] 6ITdtvFQqY:
Using most of the images from http://www.lagom.nl/lcd-test/gradient.php (I've cut them to the native resolution to avoid rescaling), setting the brightness to full, I've seen no problems with any of them (in QuickPic). However, the gradient image does show a very tiny hint of a beginning of banding in the dark area when holding the display to less than 20 centimeters.
[Galaxy S II General] stijnr:
I was reading up on this thread as I also see some banding in e.g. Angry Birds. The gradient test app only shows real banding on green.

I also noticed that when visiting the lagom test site it shows quite some banding in the stock browser. As you zoom in and out, it also seems to have a limited color depth at some levels; i.e. there are distinct lines at even distances. There's also some pink hue displayed in the grey/white area on my phone.

I opened the same page in Opera Mobile and the same banding was there, but even more artifacts on the horizontal line between the two gradients.

Opening the same page in xScope produces an almost perfectly smooth gradient.
[Galaxy S II General] deanwray:
So that proves the crap browser is set to 565 and the good one that had no gradients is set to 888, tis just watever the developer sets it to
[Galaxy S II General] deanwray:
But if ne1 who still thinks there is a rom/screen prob tries my app (set to 888) and in anything other than low green sees banding, then will look into it more myself, otherwise there ain't a prob, for those that want no banding in angry birds, email rovio and ask them to do a high colour version :) or any dev of and app where they see it
[Galaxy S II General] godutch:
I don't think I see any banding on my desire (slcd)
[Galaxy S II General] jvidia:
and ? :confused:
[Galaxy S II General] godutch:
I think I found something interesting I just took a screenshot with QtADB: no banding (when viewed on my pc), a screenshot from phone (power+home)->banding even when seen on my computer!
[Galaxy S II General] simacca:
That's because it's slcd and doesn't suffer from these problems. We are talking about oled :)
[Galaxy S II General] godutch:
Anyone wants to swap htc sensation (mint condition) for a sgs2 (mint condition)?
[Galaxy S II General] jvidia:
where did you get that aplication?
[Galaxy S II General] godutch:
I am on a very poor connection but deanwray posted is, search his posts
[Galaxy S II General] virenjoky:
The marching bands!

Anyone know how to solve this? Got my GS2 yesterday, and the first thing I noticed is the gradient bands. Suprisingly (as others have noted) videos look good, and some apps (Dolphin HD browser) display the gradients well. This is probably the single most irritating thing for me in this phone. :confused:
[Galaxy S II General] deanwray:
Easy, ask the dev of the paticular app to do a high colour version, and maybe increase the contrast, cause u have an amoled plus screen. :)
[Galaxy S II General] jvidia:
Found this video review where the S2 enters, and look at 00:35" if you see banding in the gray gradient test:

http://www.youtube.com/watch?v=I4UKiafUVIk&NR

What do you think?
[Galaxy S II General] Silver420:
I wish it was software, though think its going to be a hardware prob.. Not sure why so many of you think its software related? :confused:
[Galaxy S II General] deanwray:
If u use my app do u see banding?
[Galaxy S II General] Silver420:
I havent used your app. I dont need too, every device has this problem regardless if people can "see" it or not.

I did download the apple grey wallpaper that was in another (long) thread and could see the gradient difference between the left and right hand of the screen.
[Galaxy S II General] deanwray:
well if you haven't tried my gradient test app that I DEFINITELY set to 888 then how do you know it's not 16bit preference of the developer for performance reasons?

I'm doing a few apps at the mo, and one of them I put a global switch into it so you can switch 16/24 to show performance increase on lesser devices and on the low I get banding, on high colour I don't. Yes samoled+ shows banding more or 16bit mode than other displays, but is fine at hi-colour.

May do a video to show this, although it should be apparent from my 2 little test apps I posted
[Galaxy S II General] RogerPodacter:
Its most definitely software in my opinion. The nexus one had banding just like this, all over the place. Finally with 2.3.3 the issue was fixed and Google admitted the changed bit from 16 bit up to 24. And now all these test images are smooth ad butter like they should be.

I believe this amoled plus display is the same. Hell its a later generation hardware by Samsung so it likely got more capable not less, so I think its just missing these same optimizations.
[Galaxy S II General] deanwray:
They dont state they forcing the app that is displaying to 24bit, so not sure what that proves
[Galaxy S II General] Silver420:
Are you on about JUST the banding, or also the yellowish tint on the left hand side? :o

If you mean both I really dont get why 16bit colours would make one part of the screeen look different to the other?

Again, I hope your right, and whilst I admit I havent read every reply in this thread... Its because I read another thread on here that was 177 pages long regarding the same issue (plus the yellowish tint) and most people in there believed it to be hardware.
[Galaxy S II General] deanwray:
oh sh*t, if you have yellow thingy then thats bad. But topic is banding so on about that. Gonna do a little vid in one of my apps to show what the diff between 16/24 is/does :)
[Galaxy S II General] Silver420:
lol its not yellow as such though is on every S2 so its not just me thats unlucky....

Though it dont bother me enough to send it back :D
[Galaxy S II General] jaisun2004:
not at all satisfied

I am not at all pleased with this banding issue.. i was expecting the screen to be the best in the world.. my wave amoled was awesome.. :mad:

But was relieved a bit whn i read through this thread and to know that this might just be a software issue.

am not a techie.. Please samsung fix this ASAP.. :confused:
[Galaxy S II General] kyouko:
Has anyone tried making a custom bootanimation/screen that's a gradient to see if the banding is still there?

Just a thought :D I dunno if screens before the whole UI is loaded would be any different, but it's worth a shot.

Edit: ...assuming this is still a problem. I don't even have this phone xD
[Galaxy S II General] tuhinz:
Mine has an O2 bootscreen which is where I first noticed the banding! If anything, its even worse than that I see in other wallpapers. However it could also be due to the quality of the O2 image! :-)
[Galaxy S II General] jvidia:
This issue is under rated for the most of the people, I dont understand why ?

I think if the SII was VGA only still some people won't mind.

This is a top notch gadget and some people are still too little demanding on the quality of it. :(

Along with the yellow issue, I classify this problem as inadmissible :mad:
[Galaxy S II General] gtda:
the vertical lines, the blue hue, the colour banding make my screen look like crap

its enough to make me want to sell it or return it for a different phone

im keen to find myself a htc sensation, or go back to sgs1

very dissappointed that the best screen on the market looks worse than my sgs1

ive only had my phone since monday and already i dont want it :mad:
[Galaxy S II General] TacticalTimbo:
Yes I have these vertical line too, there are also ones going horizontally as well if you look at plain grey/light blue backgrounds, particularly in low light with brightness down.

At first the I was confused reading the posts on banding and wasn't sure if that was what it was, well its not. I do have the banding, but this is different...when the image moves on the screen these dark gray and white pixel lines stay stationary; this must rule it out as banding and make it a screen defect instead. Honestly its so noticeable to me that I can see it in games, web browser and even over my wallpaper at times.
[Galaxy S II General] gtda:
im prepared to sell mine coz im that dissapointed with the screen, everything else about this phone is great (well apart from battery life, but my old sgs was the same)

optus have no drama replacing my phone but ive flashed generic firmware and currently having trouble finding a complete optus rom

im worried if i do get it replaced the screen will just be the same

and there is no phone equivalent to this right now

apart from htc sensation and ive heard its quite laggy
[EVO 4G Q&A, Help & Troubleshooting] Bassist Of Last Life:
I'm recieving text messages and voicemails(from apparent missed calls that never reached me) hours later... It's been happening with all roms: CM 7.0.3.1., Evio All Versions, Warm RLS5 2.2, Vaelpak, etc... It even occured after I unrooted the phone. Any suggestions? Evo 4g 0003.
[EVO 4G Q&A, Help & Troubleshooting] teh roxxorz:
If I recall [could be wrong] someone correct me, but I believe that's due to a network issue. So I would advise waiting it out, or call your sprint store and let them know.
[EVO 4G Q&A, Help & Troubleshooting] dougjamal:
teh roxxxorz is correct. That is a network issue and has nothing to do with your rom(s).

posting & replying via the XDA Premium app.
[EVO 4G Q&A, Help & Troubleshooting] Bassist Of Last Life:
Thanks

Alrighty Then.haha
[Atrix 4G General] firefox3:
Yeah , so i put an alarm for 4 in the morning and i completely did not hear the noise. So the phone was going off for 2 and a half hours. The screen was on the whole time and it was on the charger. I go to turn off the alarm and the phone screen was sooooo hot. So i took out the battery and let it chill. Put it back in and now when i turn it on it says thats stuff about the sd card and blah blah and then it shuts off. I have a warranty and i think this will cover it.
[Atrix 4G General] DarrellRaines:
Thanks for sharing....

Now be honest, the alarm wasn't the issue. We know you were watching porn for hours this morning. :-D

Seriously though, definately warranty that sucker.
[Atrix 4G General] crasite:
I also have the same problem this very morning for the first time

the battery went up to about 70 degree celcius
[Atrix 4G General] roharia:
Guys there was thus nekked lady on the screen jumping on top of this Guy and 10 minutes later my phone got hot, do you fink i made the phone mad? Momma told me not to look at the nekked lady! xD
[Atrix 4G General] DarrellRaines:
See I knew I wasn't the only person watching porn on the phone!
[Atrix 4G General] Blue Puma:
My phone has gotten a lot hotter since the last update.
[Atrix 4G General] JayRolla:
The iphone shuts off and gives you a warning when overheated so it doesnt damage the phone. Android OS doesnt have this precaution?
[Atrix 4G General] roharia:
Yea i left my old iPhone under a lamp once and when i came back it was hotter than a frying pan and had a yellow caution sign on it xD. It still worked though
[Atrix 4G General] GoodFoot:
I noticed that too. Perhaps it's because the radio is using more power?
[Atrix 4G General] wonderli:
I also met this problem today, everything goes weird since I update my Atrix4G several days ago...

Is this related with system update?
[Atrix 4G General] intimnasc:
I had a heat issue some time ago before the 1.83 update. I believe mine was related to some of the apps I had loaded periodically turned things on and off like the GPS and WiFi. Since flashing back and updating to .83 then rooting I haven't had that problem.
[Atrix 4G General] ccrows:
*looks over at Bell phone*

What update?... :confused:
[Galaxy S I9000 General] hezishohat:
Hi

I got this Galaxy S GT-I9000.

my friend purchase for me in London.

from day one, it restart it self very often.

no application is open, Battary is almost full and it restart, after few minuts, restart again and again. :mad:

I tried almost everything.

factory reset

hard reset

wipe data

all karnels

all roms

bootloader

original samsung rom with no application installed.

then I upgraded to the JVK 2.3.3

new roms

JVB

every time it works great for few hours

and then, the restarts came back.

sometime after hours, sometime after minuts

is it possibale that there is a hardware problem?

thanks

Hezi
[Galaxy S I9000 General] azzledazzle:
flash stock eclair via odin with pit and re-partition

do not install any apps,

if the problem still remains, its most likely hardware related

send off to samsung for repairs
[Galaxy S I9000 General] hezishohat:
thanks

will do and let you know
[Galaxy S I9000 General] hezishohat:
well, didn't help

works fine for few hours, then start restarting

or black screen (no key is working and I have to take the battery out)

I'm going to send it to Samsung

thanks for your advice

Hezi
[Galaxy S I9000 General] oserx:
so ... it happened to me some time ago ... my phone's on/off microcontact was ... a little ... defective... it was only ~ 2.5Euro/3.5USD ...

changed it .. now it's like new ... it seems that my wife's phone has the same problem from time to time ...