Temp fix for different calibrated screens - One (M7) General

I was just reading stuff on the Samsung forums unfortunately S4 user are having issues with red and pink push which leads to smearing on their screens while scrolling I found a link for a app that lets u calibrate red,blue,green on our displays even lets you adjust the contrast.This should help until we get a perm fix.The app is called screen adjuster ...Post results so we can figure out the best setting..https://play.google.com/store/apps/...t=W251bGwsMSwyLDEsImNvbS5uZXRtYW5zbGFiLnNhIl0.

Works ok (I've used it ever since they took away native kernel level controls in CM versions later than CM7)
Just be aware all it can do is *add* light. It bumps up the R G or B values for every pixel in the entire panel at the same time, even black. So at some point blacks will start to look washed out. This lowers contrast generally and does nothing to help gamma.
My personal recommendation is to just use two of the three RGB sliders (you shouldn't ever need to use all three unless you like your blacks to be some perfectly calibrated shade of gray instead), ignore other settings. The HTC One does not have an OLED display like a nexus.
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Related

Do all the newer/newish Epics/Galaxies have yellow/yellowish displays?

I just got an Epic.
Reading several threads across the Galaxy line, there is apparently a variation in screen color temperatures. From my readings, I see a pattern where perhaps the newer/replacement units have yellower screens. At the same time, those newer units also get darker in auto brightness mode than the older units.
From my own observation, the color temp gets cooler as the brightness increases.
Is it possible that Samsung tweaked the auto brightness so that the phone now gets darker in order to save the battery? So perhaps the different color temp observed are a function of how bright the screen is?
I don't care for the yellowish screen on my new Epic. I like a cooler/colder screen. Comparing the Epic next to my LCD Evo and Touch Pro 2, it is outright yellow. Comparing the 3 phones next to my Nexus One, the N1's screen looks pink. (I can post some pics tomorrow).
Bottom line, I'm trying to decide if I should try to return/exchange the phone for another and hope for the best. I read that there are some potential software solutions out of XDA, but I prefer to have a phone that is natively "cold".
Any input would be great.
Thanks.
Mine's pretty yellow. :-( In brighter light, it is not a problem. Darker screen is the result of a software update. Got mine on launch day.
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APOLAUF said:
Mine's pretty yellow. :-( In brighter light, it is not a problem. Darker screen is the result of a software update. Got mine on launch day.
Sent from my SPH-D700 using XDA App
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Thanks for the information. Before the software update, when the screen didn't get as dark, did it appear less yellow at the [pre-update] low brightness?
In other words, does the screen now look more yellow than ever since the update and darker screen?
Cheers.
I got my Epic on Oct 1st, and I haven't noticed this yellowish at all, but maybe I need to do a thorough side by side with an older model?
Did you get any pics to post up yet? I'm interested to see this
Edit: Sorry, just saw you said you can't post pics until tomorrow.
snovvman said:
Thanks for the information. Before the software update, when the screen didn't get as dark, did it appear less yellow at the [pre-update] low brightness?
In other words, does the screen now look more yellow than ever since the update and darker screen?
Cheers.
Click to expand...
Click to collapse
Just as yellow as always. Post-update, the screen dims more. At this point, it appears yellower. My Captivate also now dims more, post-update, and seems bluer at dimmest setting.
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The only time I've had problems with my screen was when my phone had gotten damage from water. I'm on my 2nd epic and this one doesn't have any yellowish tints. Only about a week old now.
Sent from my SPH-D700 using XDA App
I picked up my Epic on 9/29 and don't see any yellow tint at all. I'm not an expert here but I think I would notice a tint like that. My blacks are very clear and dark also. I did notice that it seemed to run on auto brightness a little darker than it had...that was probably the D-118 update after I had it for only a few days.
I will follow this thread and see where it goes.
I don't think the screen color variation is based on release date. I have two of them since 8/30. One of them has a yellowish tint compared to the other. They both have the same DI18 update.
It seems like a coin-toss what screen color comes. I wish we have a tool that would allow easy color temperature adjustment.
I read a thread about a way using a modified kernel, but it would be nice to have an .apk that works (even if it requires root).
I got one on launch day that had more of a blue tint to it. I got another one last week that was a refurb, and it definitely is more yellow.
Weird. I just got mine today and it's very cool (read: blue) compared to my Evo... being a photo guy, this drives me nuts. I prefer warmer diplays.
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I have one of the cooler screens, and I kinda like it.
My thoughts:
1) Samsung is trying to extend the life of the blue oLEDs by altering the color temperature of screens. Since this seems to be happening independently of ROM version, it's probably something they're doing with firmware.
2) (IMO More Likely) The screens on different phones came from different assembly lines or different production runs, and have a slight variance in color production. The production date of the phone wouldn't necessarily matter in this case.
The only project I know that deals with the color temperature of the screen is voodoo:
http://project-voodoo.org/color
I currently have it running on my ROM. It adds a new "very low" brightness setting a the bottom that's much dimmer than even the lowest one available in DI18. (Note: it doesn't interpolate levels between them, either. Meaning there is a big jump in brightness from the voodoo lowest level to the DI18 lowest level, which is the next "notch" up on the slider.) It also adds a brightness level at the very highest brightness, which noticeably makes the display warmer. (The highest and next-to-highest brightness notches are the same brightness, the difference being the highest one is warmer.) At this point of its development, it's really of no use if you want to make your screen warmer at all brightness levels.
At any rate, the project leads me to believe that, with further development, we could have an app that allows us to freely change all the color settings for the display for all brightness levels, save them to profiles, etc.
The idea of the screen getting warmer as you decrease its brightness might be a natural phenomena, or just perceptual. In my experience, colors usually seem warmer as you decrease the intensity of the light. This is even true of light on a physical object.
My screen looks awesome. No yellowing or anything. I wonder if there is a difference based on who made the screen for that particular Galaxy S phone? I remember reading an article when all the Galaxy S phones started rolling out saying that Samsung was having trouble with the manufacturing of the AMOLED screens. Perhaps they started cutting corners.
However, there also seems to be issues with auto-brightness, etc...I have that disabled on my phone and the brightness set on its lowest setting (which is plenty bright for me and all my viewing needs) which may be the difference? But, I have cranked it up from time to time just to show others and I still don't notice any yellowing.
Is there a specific test image or something where one could view that would show/exaggerate the effect people are talking about? I would be curious to see...
Thanks for the great input and information.
Here is something interesting for the Nexus One screen.
http://forum.xda-developers.com/showthread.php?t=745248
Never noticed any of the sort.
Forgive My Brevity. To Be Or Not To Be...
I havent noticed it either. Had mine since day one
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http://forum.xda-developers.com/showthread.php?t=745248
Should help in this case once Froyo arrives
Here is a quick picture taken by a Touch Pro 1. Sorry about the quality. I can try to take better ones if there is interest.
From left to right - Evo, Epic, Nexus 1, Touch Pro 2. All with auto-brightness on.
In real life:
The Evo looks whiter (cooler)
The Epic looks much yellower (warmer, almost greenish)
The N1 doesn't look as pink as it appears, but looks the darkest
The Touch Pro 2 looks the whitest (coolest)
To my eyes, the Evo/Touch Pro 2 looks good. Although the picture shows the Epic looking pleasant and only slightly warmer, the white elements (clouds in wallpaper, browser backgrounds etc.) look yellow/green.
Edit: Notice the Menu, Home, Back, Search menu LEDs look whiter than the screen. See the contrast between the two makes the screen look yellower.
I've owned 3 Epics since launch day. First one had a good screen, 2nd one had a yellow tint, 3rd was perfect.
The build dates of the first 2 were 10.08 and my current one is 10.09.
arashed31 said:
I've owned 3 Epics since launch day. First one had a good screen, 2nd one had a yellow tint, 3rd was perfect.
The build dates of the first 2 were 10.08 and my current one is 10.09.
Click to expand...
Click to collapse
By perfect, do you mean that it is not yellowish? It's interesting that the first two phones with the same build date has two different color screens...
The Epic I have has a 10.10 build date. It's yellow at dimmed levels and color temp gets cooler as it brightens up.

IMPORTANT: Screen

So can anyone confirm that the striations or lines on the screen are normal??
Im talking about when you pull down the notifications bar there are light lines that come down vertically and soma cases are horizontal.
Please let me know I got 30 days with it. thanks!
azzeh3 said:
So can anyone confirm that the striations or lines on the screen are normal??
Im talking about when you pull down the notifications bar there are light lines that come down vertically and soma cases are horizontal.
Please let me know I got 30 days with it. thanks!
Click to expand...
Click to collapse
my first nexus s had darker whites than the display model at the store. I would recommend comparing yours with the store display or another persons nexus s, I think this is the best way, since we cant physically see how your phone screen looks. good luck
Are you referring to the gray section where your service provider is listed? Or the very dark area where the notifications are listed?
If I stare I can see some lines in the gray area.
I do see a slight grid pattern in the power control widget.
No I'm talking about grey section where your messages show up
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I think its screen burn in already
Sent from my Nexus S using XDA App
I don't have a Nexus S, but I have a Galaxy S i9000M which has a similar (if not exactly the same) screen. If I bring up a screen that is a solid colour, I do notice some imperfections like you describe. They are hardly noticeable though.
Weird. My nexus doesn't have that and I would know, I modded my nexus 1 to be pretty much like gingerbread 6 months back, massive burn in.
Sent from my Nexus S using XDA App
actually no.... mine doesn't have any lines or defects.
the only lines are the horizontal ones separating the notifications.
I think I know what you mean. My N1 on certain backgrounds has very faint grey lines. Not always visible, even on white web pages
Sent from my Nexus One
dudeimgeorge said:
Weird. My nexus doesn't have that and I would know, I modded my nexus 1 to be pretty much like gingerbread 6 months back, massive burn in.
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Click to collapse
Why would that cause burn in more than anything else?
I don't know but I don't want it to get worse over time
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Yes, I can see it. I can see it on any AMOLED/SAMOLED phone I've ever come in contact with. It's the nature of AMOLED screens unlike most LCD screens. With AMOLED, each pixel is individually powered, and it's impossible to have each pixel (or subpixel) be identical, which leads to slight differences in output and color reproduction. An LCD screen is backlight by either florescent tubes or recently, LEDs, which produce an even backlight (usually) where the colors are controlled by filtering each pixel, rather than having to illuminate each pixel.
Anyway, I only really notice it when the brightness is at the minimum and it's very dark in the place I'm using my phone. If I crank up the brightness or if I'm in a well lit area, I don't notice it at all really. Although if it's VERY obvious, you might have a screen that's significantly lower quality than average... it happens, bad QC or something, exchange it.
Oh, and if you stare at a plasma TV long enough you'll notice the same thing... similar technology, each pixel illuminated individually.

Inverse screen colours to save battery

I was wondering, on the mac if you press command+ option+ control+ F8 it inverses the screen colours.
Ie. If the screen back ground on browser is white, it will become black and the fonts become white. I use it all the time to read in the night and avoid screen glare.
But if someone could do something like this for our note, we might beable to reduce the battery consumption while browsing etc for example.
It would really use the oled properties too save battery.
Just a thought.
Ps. I use tapatalk with the black back ground, and it's easier on the eyes.
It's there such an app that can do this for any screen on our note?
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I second that. At night it would be great to be able to invert the colors on the browser.
No replies yet?
By the way, strange coincidence, I had been thinking about the same thing since morning...
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http://forum.xda-developers.com/showthread.php?t=1326434
There are some blackout themes for android. one in particular is black android 2.5. i used it on my gs2 and with nitr8's insanity mod i was getting 4 days batt life.
if you make sure and use as little of the display as described in the thread that neverthemore posted, your display will use very little power. thin fonts, black backgrounds where ever possible. i heard somewhere that red uses the least amount of power, but im sure that topic is very open for discussion.
either way, using a single solid color over white is a good idea since white needs all the pixels on, whereas red would only use red pixels. green uses green etc etc but since the samoled has the pen tile i believe that means 2 green sub pixels? right? somebody please correct me if i am wrong.
I'd really like something like this, also! Just a few hours ago I started a thread in the XDA forums main forum for forum related issues (can we say forum a few more times?) asking for a dark theme for us AMOLED users.
ChadTheWocko has a great work around for using opera mobile, but once you change it it's difficult to change back. I'd love a simple toggle widget for reversing colors.
Maybe chainfire 3d can do this if CF gives it some more of that love has

Screen calibration?

http://www.displaymate.com/OLED_Galaxy_S123_ShootOut_1.htm
The OLED screen on the GS3 is incredible because of it's intense contrast and instant refresh time, but there a many things wrong with it out of the box, and only because Samsung marketing is driving the settings for it....
The color gamut is too high. It looks good in the store but makes the colors look cartoony, and can decrease lifetime of the display. Is there something that can get it closer to the sRGB gamut used by Android? (90-110% of the gamut)
The autobrightness is very poor in this case, as it does not go low enough in the dark, and does not go high enough in the sun. Has anyone made a mod that has proper autobrightness values, with some middle values turned slightly lower for battery savings?
The white point is very very blue! This makes the display look more white, but this is actually very bad for the display. Since the reason why Samsung needed to have PenTile is because blue pixels die quickly, why is the white so blue? Is there some way to make it properly white (daylight, about 6500k?), in order for better color accuracy and to preserve display lifespan?
At some point, supercurio released a voodoo screen application, but since then I have not seen any sort of application that can properly calibrate the screen...
My cousin has one and it is not like that.. I would return it
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For a new one
Sent from my HTC Velocity 4G using xda app-developers app
Hunt3r.j2 said:
http://www.displaymate.com/OLED_Galaxy_S123_ShootOut_1.htm
The OLED screen on the GS3 is incredible because of it's intense contrast and instant refresh time, but there a many things wrong with it out of the box, and only because Samsung marketing is driving the settings for it....
The color gamut is too high. It looks good in the store but makes the colors look cartoony, and can decrease lifetime of the display. Is there something that can get it closer to the sRGB gamut used by Android? (90-110% of the gamut)
The autobrightness is very poor in this case, as it does not go low enough in the dark, and does not go high enough in the sun. Has anyone made a mod that has proper autobrightness values, with some middle values turned slightly lower for battery savings?
The white point is very very blue! This makes the display look more white, but this is actually very bad for the display. Since the reason why Samsung needed to have PenTile is because blue pixels die quickly, why is the white so blue? Is there some way to make it properly white (daylight, about 6500k?), in order for better color accuracy and to preserve display lifespan?
At some point, supercurio released a voodoo screen application, but since then I have not seen any sort of application that can properly calibrate the screen...
Click to expand...
Click to collapse
Samsung anything with a screen is this way. Just go look at this TV, they are bluer than anybody else's. They look good in the bright showroom but in your actual house? Not so much unless you just love blue.
I am guessing a fix can happen in aosp/aokp where they have the screen calibration options.
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nosympathy said:
Samsung anything with a screen is this way. Just go look at this TV, they are bluer than anybody else's. They look good in the bright showroom but in your actual house? Not so much unless you just love blue.
I am guessing a fix can happen in aosp/aokp where they have the screen calibration options.
Sent from my ADR6425LVW using xda app-developers app
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I just found out about Voodoo Color. Maybe we can get some kernels that work with it?
Hunt3r.j2 said:
I just found out about Voodoo Color. Maybe we can get some kernels that work with it?
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Click to collapse
That'd be great. I am on Verizon tho :/. No custom kernels yet.
I love OLED displays I just hate how.blue they are. Atleast this one isn't as blue per that article as some others I have seen.
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nosympathy said:
Samsung anything with a screen is this way. Just go look at this TV, they are bluer than anybody else's. They look good in the bright showroom but in your actual house? Not so much unless you just love blue.
I am guessing a fix can happen in aosp/aokp where they have the screen calibration options.
Sent from my ADR6425LVW using xda app-developers app
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Click to collapse
As far as TV's go, those are way more easy to tweak display settings on than a phone display. I agree that a showroom Samsung is really really blue, but that is easily fixed in the color settings.
thebrokn said:
As far as TV's go, those are way more easy to tweak display settings on than a phone display. I agree that a showroom Samsung is really really blue, but that is easily fixed in the color settings.
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Click to collapse
Yeah...sorta. lol...
There is a forced level of blue in the service menu you cannot change without proper calibration equipment.
That is beside the point though. I know CM7 had a calibration setting. Does CM9/AOKP have this still? I haven't had a device that could run AOSP in a long time sadly.
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Pinkish lower left corner on the screen

I got the AT&T SGS4 today and upon getting home I realized the lower left corner of my phone's screen has a slight pinkish hue to it. Is this common and I'm being overly anal and just need to deal with it or is this an actual defect with my phone? If this is something common are there any apps that can adjust screen settings to alleviate this? Is there a screen "break-in" time needed for colors to normalize on the SGS4?
It is a seriously small thing, but it just bothers me and will continue to do so for at least the first few weeks of ownership. Also I have spent 4 hours researching this, but all I can find on the internet are results for the SGS2 and SGS3 and Gnex screen issues, oh and a few threads on the Gnote...in other words the internet seems saturated with Galaxy making it hard to search.
Thanks for any answers.
Bump
I have the same problem the lower half of my screen towards the bottom has a slight pinkish purple tint to it that's only visible in Grey's and sometimes and other types of screens but it's definitely there. And no it is not normal just grab another s-4 and put it aside by side and you will see the difference. Go and exchange it if you can
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pezlomd said:
I have the same problem the lower half of my screen towards the bottom has a slight pinkish purple tint to it that's only visible in Grey's and sometimes and other types of screens but it's definitely there. And no it is not normal just grab another s-4 and put it aside by side and you will see the difference. Go and exchange it if you can
Sent from my SGH-M919 using xda app-developers app
Click to expand...
Click to collapse
I came to the S4 after two HTC Ones that both had build quality issues, I'm going to the give the phone a week to "settle" since I am tired of going to the AT&T store and maybe with enough screen on time it can balance out (I don't know, I'm just hopeful). In the mean time is there any app that can be used to adjust the contrast or gamma settings with or without root? I've been trying to find one so I can at least "hide" the screen difference, but so far the only thing similar I can find is "Color Temperature" settings that based upon the threads I've been through are only in Task650's AOKP.
I just checked mine on a white and grey screen and there is a very slight purple tint. I also now hate you for making me notice it because I never did before.
To be honest though it is barely visible and doesn't bother me. Reminds me of the screen lines on the gs2 that I eventually got used to and forgot were there.
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