Galaxy Note colour rendering issue: started working on it.

a3plew · Apr 8, 2012

The att note recently got a ics leak. The banding issues seem to be fixed as can be seen on the xda app splash screen. They changed something so with the test image with the numbers it is a un smooth trasition from about number 7. With gingerbread you could see all the numbers. so they are changing something. It seems to create a new problem with the greys though

. But it's something that I will be temporarily happy with until this is hopefully resolved.

EdgaBimbam · Apr 9, 2012

a3plew said:
The att note recently got a ics leak. The banding issues seem to be fixed as can be seen on the xda app splash screen. They changed something so with the test image with the numbers it is a un smooth trasition from about number 7. With gingerbread you could see all the numbers. so they are changing something. It seems to create a new problem with the greys though . But it's something that I will be temporarily happy with until this is hopefully resolved.

what about iron man 2 trailer? there is black color clipping? ;D

iffamies · Apr 9, 2012

If my Note has these color isses etc. Can I ask warranty repair to replace the screen to "fix" it?

btyork · Apr 9, 2012

iffamies said:
If my Note has these color isses etc. Can I ask warranty repair to replace the screen to "fix" it?

Ha! No.

Sent from my GT-N7000 using Tapatalk 2 Beta-5

EdgaBimbam · Apr 9, 2012

btyork said:
Ha! No.

Sent from my GT-N7000 using Tapatalk 2 Beta-5

i got refund because of black color clipping, so dont say no ^^

knightnz · Apr 9, 2012

EdgaBimbam said:
i got refund because of black color clipping, so dont say no ^^

He asked if it can be repaired, not if he could return it for a refund.

PaulF8080 · Apr 10, 2012

I registered to relate a couple of stories that sound like this problem.

I worked for a company that made large alpha-numeric displays using character arrays build of a 5x7 array of incandescent bulbs. To save money on ascii to 5x7 encoders we would turn on 1 out 8 characters at time with 8 times the power. The filaments in the bulbs would average the power.

Fast forward to the invention of LEDs. The above method did not work because even though the average power was the same the LEDs switched so fast the human eye would perceive the peak power. We had to crank the peak power down.

Fast forward again and I was looking at the gamma test and I said maybe my eyes are seeing the peak power making most of the bars perceived as bright. The interesting thing, that kind of confirms this, is that when I look at the gamma test on my Note using the camera on Captivate in a dark room the bars are not all bright. They are graduated. I am guessing in low light the Captivate's sensor "shutter" is open longer than the Note refresh rate to average the power. I am also guessing the lower bits of the color pallet modulate the power pulse width(PWM) and the peak is set by the upper bits.

That's my story and I am sticking to it. Incidentally not all eyes are the same. I know of at least one person could not look at our LED displays because they strobed(especially under florescent lights).

duowing · Apr 10, 2012

One interesting thing I noticed was with the two Notes side by side on the previous page how one seems to be more blobbed, where the other is more defined, but has worse banding. If you look at the one that has more definition the display itself looks brighter vs. the more blobbed one is dimmer. I was able to go into a dark room and get both results. By adjusting brightness a lot higher I was able to get pretty much the right image, then by lower brightness or going back to auto I was seeing the left image. So in my mind part of the reason people are seeing such different results also depends on the screen brightness. Similar to the crosshatch/linen pattern or whatever you want to call it. When lower brightness that background becomes more apparent, but at high brightness it seems to disappear.

Rezz · Apr 10, 2012

duowing said:
One interesting thing I noticed was with the two Notes side by side on the previous page how one seems to be more blobbed, where the other is more defined, but has worse banding. If you look at the one that has more definition the display itself looks brighter vs. the more blobbed one is dimmer. I was able to go into a dark room and get both results. By adjusting brightness a lot higher I was able to get pretty much the right image, then by lower brightness or going back to auto I was seeing the left image. So in my mind part of the reason people are seeing such different results also depends on the screen brightness. Similar to the crosshatch/linen pattern or whatever you want to call it. When lower brightness that background becomes more apparent, but at high brightness it seems to disappear.

I set both devices on the same brightness and color mode, so thats not it.

The main difference is that the right one shows better blacks, where mine, the one on the left, is more grey, so the gradient seems more smooth when in fact its just washed out.

This is because that when the pixels are lit, the darkest color it shows is grey instead of near black.

I really hope this will be fixed soon, because I love everything else about my note and I'd hate to go back to a smaller screen.

celtichazard · Apr 10, 2012

Rezz said:
I set both devices on the same brightness and color mode, so thats not it.

The main difference is that the right one shows better blacks, where mine, the one on the left, is more grey, so the gradient seems more smooth when in fact its just washed out.

This is because that when the pixels are lit, the darkest color it shows is grey instead of near black.

I really hope this will be fixed soon, because I love everything else about my note and I'd hate to go back to a smaller screen.

I have the same problem my withe note displays more brightness, the other display like you say is lke a Grey filter on the screen or something but the brigness is not at max

CONTACTMC · Apr 11, 2012

My note next to my wifes galaxy s 2, you can clearly see the gamma problem in this pic, I have contacted Samsung, awaiting reply.

Rezz · Apr 11, 2012

At least yours goes to 4, mine starts displaying grey at 2

M3TALLICA · Apr 11, 2012

Somebody please upload the image in above pic thanks.

maxld · Apr 11, 2012

Boy124 said:
Somebody please upload the image in above pic thanks.

http://imageshack.us/photo/my-images/690/gammatest.png/

PaulF8080 · Apr 12, 2012

sibere said:
I do have clipping because level 1 is too bright.
So when blacks are level 1 and 0 close together, I have a sudden drop from dark grey to deep black. not visible in a normal environement, but very visible in a dark room.

Sent from my GT-N7000 using xda premium

Beware, only my second post.

I have the same problem, but am not sure if it is THE problem. My total wild guess from previous hardware design experience is that what I am "seeing" is a Persistence of Vision(POV) problem.

My guess is the voltage levels look like this:
L 0 _____________________________
L 1 __--_____________________--___
L 2 __----___________________----_

L 2 emits more light than L 1 because it's pulses are wider. Unfortunately your eyes do not work that way. They persistently remember the peak brightness for 1/25 sec no matter how wide the pulse. So level 1 and 2 are "seen" as the same brightness. If your eyes are deceiving you, how do you know this is happening? You look at the Note screen using a camera in dark room. Cameras average the total light. I guess I am saying that it may a hardware limitation were digital analog converters that adjust the height of the above pulses may not have enough bits to handle all 24+ bits so the designers may have resorted to pulse width modulation(PWM). A bug for sure. I have been there.

pboesboes · Apr 12, 2012

Have you tried opening the pic in the gallery? Mine looks like that in the ICS browser but is perfect in the gallery.

Rezz · Apr 12, 2012

Mine shows like that in gallery, but in quickpic I can see all the way to 1.

Nontheless, we shouldnt be able to start seeing greys up untill 10 or so, so its all crap.

CONTACTMC · Apr 13, 2012

I contacted Samsung and was advised that my screen is faulty, I have sent it back and am awaiting a replacement, will let you know how the new one looks.

letters_to_cleo · Apr 13, 2012

so far there are really no perfect screens still out there.. no matter how many times your going to exchange screens, the screen you have would tantamount itself to have issues still. Just like a panel lottery, some replacement screens have better color rendition over the other, in expense of another faulty thing again that you might notice later on, when you examine it closely....

just my take

CONTACTMC · Apr 13, 2012

Yeah but for £450 we should not accept poor quality. They advertise it as being a great screen for watching movies etc, and thats what I expect for my hard earned ££££, we all should.

Galaxy Note colour rendering issue: started working on it.

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