Database Users

HD2 color banding

"Not another 16bit banding thread" you think? No! (Well maybe, but I haven't found anything ...)
So anyway, this is a very strange thing I noticed, I've got this wallpaper I made, with a lot of gradients. I think: "well, the gradients won't be so smooth on my HD2", so I email it to my phone and try to open it. This is the original image:
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
To my surprise, when I open the image the gradients are all smooth! Wow this is great!
So I set it as my wallpaper and what I see, color banding ... When I go to the images hub I see the banding too.
So HD2 IS capable to display smooth gradients but WP7 restricts it?! (Believe me, the gradients are very smooth if I open the attachment). I'm using WP7 without any updates, so no nodo with it's 16bit banding bug.
How is this possible? I'm gonna try the registry fix right away. Maybe anybody else has noticed it?
EDIT1:
So I've applied those 3 registry tweaks found in the wp7 forum:
HKLM\Drivers\Display\Primary\PrimBPP dword 32
HKLM\Drivers\Display\Primary\bpp dword 32
HKLM\Drivers\Display\Primary\PanelBPP dword 32
And the picture in the attachment had color banding too. Once I deleted them, everything was smooth. So what's the deal here?
Greetz

when you say you deleted them and everything was fine do you mean that on the background pic and opened as attachment was ok, an via the hub?
or do you mean that the attachment got fixed again but the banding was visible on teh background.....

I download the picture to watch on my android, and the result seems more like your second render: very, very bad gradients.

So when I added those values, the gradients were bad in all places: attachment, screensaver and hub.
When I deleted them again, the gradients were bad only in the hub and on the screensaver, the attachment was ok, like in the first photo.
Very strange that android does this banding too, maybe the screen has enough colors, but the phone itself limits them? (I really don't know how these things work, I just speculate...)

As I know there where many speculations about 16 - 24bits colors.
But it seems that since we boot in nand gradients are in 16bits.
So if WP7 can show 24bits, why android can't ?
Edit: http://forum.xda-developers.com/showthread.php?t=807307

I suspect that its just cleaver programing.
a device may be limited to a 16bit colour pallate but they have probably been able to change the pallate depending on the picture.
for example, your pic is somewhat limited in terms of multi colours.
what would be intresting is if you can get a full RGB colour spread to display correctly.
infact a yellow gradient is usually the hardest for any computer device to handle, so a red-yellow gradient would be intresting too.

So I've tried with a full color gradient, but the results are not that bad... There's still more banding on the lockscreen than in the attachment.
What I've noticed is when I save the image the banding goes away because of the bad .jpg compression, the banding 'blurs' away.
What that means it that wp7 first converts to the low-bit image, compresses it and saves it as a high-bit JPG. On the lockscreen, the image is always low-bit... This is really weird.
Here are the images:
Original:
Attachment:
The banding on the right, is because of a bad photo
And the lockscreen:
The banding is "better" than the first image, but is still noticeable
EDIT1: I've tried to sending the saved image back to me. The image I've received is the original one, with no jpg artifacts or banding. So maybe there are multiple versions of the image available, the original, the one you see in the hub (with a bad compression quality and color banding) and the one you see on the lockscreen (no jpg artifacts, but with color banding).

it could be using some sort of dithering, ive read the various threads on the matter an im sure the device is capable of displaying an 18bit colour depth, which would be about 250k, if that was the case it would explain a lot,
forinstance, if you tried to display a 24 bit image the software would need to use some sort of dithering to control the colour depth, but lets assume for a second that the software doesnt dither it, and just runs it as is, would that not introduce significant banding as it wouldnt be finding nearest colours and blending them
Also, using the gray scale as an example again, if the software can change the colour pallete then that would explain why the colour image showed some banding compared to the gray scale.
Pictures are funny things, especially after compresion, if you take a jpg and run a series of blank lines through it (pixle size) you can dramatically decrease its size after compression.
just a thought

Hello,
There is any solution after Mango updare? the registry change from above doesn't work for me after I updated to Mango

[Q] Is Arc display really has 16M Colours?

I'm starting to wonder whether Arc is really having it's display set to show 16M colour!! The reason for this is the, I notice gradient/unpolished in few places; example in the "Tweetcast" application.

It;s the application not the screen

Of course it does:
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
What you see is related to that app

I can't be sure, i was counting them but the phone rang and distracted me at 14,283,102. So now i'm having to start again.
1.... 2.... 3.... 4....

Thanks everyone for the reply and everyone pointing to the application!
Is there any application that can be used to test this? (Just to make sure that I don't have a faulty screen)

What you have to bear in mind is that an image is only as good as its weakest link. Artifacts and errors can be introduced by the camera, the compression scheme (if you see banding in any jpeg image, it could easily be caused by compression algorithms), the screen driver software (IIRC, android v1.5 only supported 64k colours, regardless of screen quality) and, finally, the screen itself.
A good test for computer LCD monitors is here: http://www.lagom.nl/lcd-test/. Even though it's designed for PC monitors some of the tests are valid for mobile phone screens (but note that in lot of the tests a mobile phone web browser will perform page scaling and will shrink/expand the images, messing up the results).
However, the Gradient (banding) test should give valid results at any zoom level. If your display is 16M colours, you should get a totally smooth gradient (it does on mine, it's actually better than my computer monitor). Make sure the screen is clean, mine was covered in smeary fingerprints which didnt help at all

daveybaby said:
What you have to bear in mind is that an image is only as good as its weakest link. Artifacts and errors can be introduced by the camera, the compression scheme (if you see banding in any jpeg image, it could easily be caused by compression algorithms), the screen driver software (IIRC, android v1.5 only supported 64k colours, regardless of screen quality) and, finally, the screen itself.
A good test for computer LCD monitors is here: http://www.lagom.nl/lcd-test/. Even though it's designed for PC monitors some of the tests are valid for mobile phone screens (but note that in lot of the tests a mobile phone web browser will perform page scaling and will shrink/expand the images, messing up the results).
However, the Gradient (banding) test should give valid results at any zoom level. If your display is 16M colours, you should get a totally smooth gradient (it does on mine, it's actually better than my computer monitor). Make sure the screen is clean, mine was covered in smeary fingerprints which didnt help at all
Click to expand...
Click to collapse
Arc beat my Streak easily which beat my Dell laptop easily..lol

Well, since everyone says it could be related to application and not the screen or driver itself, I'm convinced. Let me start using and see whether how many applications are like this and might update this topic lately.
Thanks everyone for your replies.

[Q]Screen looks terrible![Q]

Hi there guys,
Currently using a i9505 in the UK, I think thats the right model, it's the Snapdragon model anyway. I recently installed the stability update that fixes that lines smudging in the settings menu, however I am experiencing a slightly stranger issue. Now I cannot tell you if the issue was here before or after the update, I have only had the phone for 2 days and when I got it home it had the update read to install.
Basically, if I open the messaging application the background appears to be "dirty". I know this sounds weird, and it's honestly the hardest thing to describe. Towards the outside of the handset it almost looks like there is backlight leak the the left and right, in the centre there are just lines running up and down, there is an obvious almost texture inside the display almost.
It is only visible in the pitch black, but also if I then click a thread and go into the messaging thread it isn't visible no more. Just to make it clear, on black black this does not appear, it's only on the backgrounds that are like one less than black if that makes sense -_- Is this going to be a future issue, or is it nothing?
Affected area:
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}

Hi. this is a global issue. basically on the areas that is black, LEDs are off, and when you scroll the screen and bring some other colors on the areas that are black the LED take some time to show the correct color and at first, colors appears as purple. this is the smearing issue that Samsung has fixed. but Samsung has fixed it by making the LEDs not to turn off on the black areas by adding some white in black areas, and it only works in Samsung apps, like the messaging and setting. but for some reason all LEDs don't become brighter in the same amount and the screen looks unevenly grey and black. but only in samsung apps. if you look at a completely black part of screen in a third-party app you'd see that its perfectly black. unless you use screen adjuster app to fix smearing in other apps too. if so in every black display, the dirtiness would show up.
and by the way, its a problem with phone's screen, so if you look at the same thing on another display nothing will be seen. just like the screenshot you made, the issue is not visible here.

Hamoonfarsa said:
Hi. this is a global issue. basically on the areas that is black, LEDs are off, and when you scroll the screen and bring some other colors on the areas that are black the LED take some time to show the correct color and at first, colors appears as purple. this is the smearing issue that Samsung has fixed. but Samsung has fixed it by making the LEDs not to turn off on the black areas by adding some white in black areas, and it only works in Samsung apps, like the messaging and setting. but for some reason all LEDs don't become brighter in the same amount and the screen looks unevenly grey and black. but only in samsung apps. if you look at a completely black part of screen in a third-party app you'd see that its perfectly black. unless you use screen adjuster app to fix smearing in other apps too. if so in every black display, the dirtiness would show up.
and by the way, its a problem with phone's screen, so if you look at the same thing on another display nothing will be seen. just like the screenshot you made, the issue is not visible here.
Click to expand...
Click to collapse
Im already aware of this issue, to make clear the issue I am describing is when the phone display is stationary

jaaystott said:
Im already aware of this issue, to make clear the issue I am describing is when the phone display is stationary
Click to expand...
Click to collapse
i discribed it if you look. "but for some reason all LEDs don't become brighter in the same amount and the screen looks unevenly grey and black."

Amoled screen defect (Every OPX issue ??)

Hi there ! I've got a problem with my OPX Amoled display. As You may know, Amoled uses only this pixels, which are necessary. So when there is a completely black wallpaper set, the screen should be "off like". But.... My screen is still a bit gray ! I don't know if every OPX has this issue or just mine. I would be greatfull if someone would also check it.
What You have to do ?
It's simple:
1) Just download this plain black wallpaper from here: https://cdn-images.xda-developers.com/direct/9/3/8/3/9/5/uploadfromtaptalk1331261546079.jpg
2) Download it to Your OPX and open it. BUT REMEMBER IT MUST BE COMPLETELY DARK IN YOUR ROOM. SO PLEASE CHECK IT AT NIGHT. ALSO YOUR EYES MUST GET USED TO DARKNESS TO SEE IF EVERYTHING IS OK.
3) Post here if everything is ok.
I'll appreciate evry post.
Look what i meen. Here are some photos with my problem:
http://zapodaj.net/c9efdc6e82a09.jpg.html
http://zapodaj.net/a4462bc518c9b.jpg.html
On the left side there's my friends Samsung Galaxy A5(also has Amoled display) with the same wallpaper already opened. On the right side there's my OPX. As You can see my screen is not pure black-rather gray. Samsung is not even visible although it's showing same wallpaper.
Please check it in Your OPXes !

Yes I can confirm this partially.
I recently tried DayDream while charging over night. Although most of the screen is not illuminated (exactly as it should be with AMOLED), some parts are. The edges on the right and bottom are slightly illuminated, too, but strangely the ones on the left and top are not.

So what kind of amoled is that ? -.-

My OPX has been even sent to warranty but i'm still waiting for it to come. I should be on monday. BTW i didn't get any reply from tech support if they even done anything with this issue.

Well mine works to 80% (still not good, I know) but yours seems indeed broken.

I'm curious how is it with other OPXex

I don't get the point, the background is not 100% black. It has a slight pattern of grey lines, so they are shown. Anyway in my OPX this problem seems to not exist. I have other pure black background I use for whatsapp and telegram and the screen is completely dark when Showing it at full screen.

ironwick said:
I don't get the point, the background is not 100% black. It has a slight pattern of grey lines, so they are shown. Anyway in my OPX this problem seems to not exist. I have other pure black background I use for whatsapp and telegram and the screen is completely dark when Showing it at full screen.
Click to expand...
Click to collapse
Would You be so nice ale give a link to Your wallpaper ? I wonder if it's Google photos app bug ??

I don't have this issue at all. Sometimes when playing games like Fallout Shelter at night in bed, the screen fades to black when loading and I can't tell if it just shut off from me not touching it because the AMOLED display turns all of the black pixels off. You WILL notice when there's any lit pixels on the display the surrounding area will be lit too, even if black/off because the light bleeds. That's just how light works.

ooops i gave a link to the wrong wallpaper. I'll update it in a second.

Done, check this one

Tanner1294 said:
I don't have this issue at all. Sometimes when playing games like Fallout Shelter at night in bed, the screen fades to black when loading and I can't tell if it just shut off from me not touching it because the AMOLED display turns all of the black pixels off. You WILL notice when there's any lit pixels on the display the surrounding area will be lit too, even if black/off because the light bleeds. That's just how light works.
Click to expand...
Click to collapse
I know everything that, but check my photos. There is for sure something wrong with my display.

Kiras_PL said:
Would You be so nice ale give a link to Your wallpaper ? I wonder if it's Google photos app bug ??
Click to expand...
Click to collapse
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
I use Cyanogen gallery app. :good:

Kiras_PL said:
I know everything that, but check my photos. There is for sure something wrong with my display.
Click to expand...
Click to collapse
Yeah there definitely shouldn't be anything showing at all unless it wasn't completely black, which that photo is (all 00000)

Tanner1294 said:
You WILL notice when there's any lit pixels on the display the surrounding area will be lit too, even if black/off because the light bleeds. That's just how light works.
Click to expand...
Click to collapse
Yes, that's happening on my device when DayDream is on.
BUT there's no reason that the edges should 'bleed' too. This is definitely an issue since only the right and bottom border are affected. The left and top ones stay off as they should be.
To be fair they don't light up very much (so it's not on or off like binary), but it's noticeable.

Try enabling the OOS dark mode and going into settings. That should look 100% black. If not, there's probably something wrong with your screen.
Mine looks entirely black. I've tried comparing it to other phones with AMOLED displays (like Galaxy S6) and it looks exactly the same when showing black.

ashwinpilgaonkar said:
Try enabling the OOS dark mode and going into settings. That should look 100% black. If not, there's probably something wrong with your screen.
Mine looks entirely black. I've tried comparing it to other phones with AMOLED displays (like Galaxy S6) and it looks exactly the same when showing black.
Click to expand...
Click to collapse
hmmm Do You also use Google Photos app ? In settings with dark mode a don't see any "gray" places.

Mine is completely dark, there was another topic likethis, i doublechecked with my eyes and with my reflex, no light at all from my screen, but it does rainbow on sun

mine isn't like that

Kiras_PL said:
hmmm Do You also use Google Photos app ? In settings with dark mode a don't see any "gray" places.
Click to expand...
Click to collapse
No, I don't use Google Photos but I downloaded it just to check. I don't seem to be having the problem you're having. My screen is the same color as that in settings with dark mode enabled.

[FIX] Yellow/Green/Red White Balance fix without Root. Yellowish tint , Yellow tint

Hello all, after getting my LG G4 yesterday I have noticed the screen on my unit exhibits a yellowish tint, especially whites look too yellow for my liking. Now, because of Boot-gate I don't want to root it this early just in case ( although I have a 607 serial number so chances of that happening are significantly smaller.)
So I researched some fixes, tested some apps and came to the conclusion that this app: [url]https://play.google.com/store/apps/details?id=co.uk.quickdoc.screenbalance[/URL] is the best solution if you are not rooted.
Because, unlike all other apps, it is not an overlay but rather uses the built-in accessibility service baked into android, it is much more accurate, is system wide ( so yes, the virtual buttons as well!) and is more energy efficient.
Now the problem is that functionality is pretty limited if you are not on the pro version. By any means , use ''your way'' to get the app because I love to support devs but asking 3 euros is just too much for a very simple app. Please support the developer however because without him we would not have had this amazing solution
My settings are as follows: (Please note that the screenshots are not INDICATIVE of the real thing, in real life it is much less blue.)
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
Before and after ( sorry for horrible pics from TF300t lol)
Feel free to post your configuration as this is still not perfect, I would love to see them and try them out to come to that perfectly calibrated white balance
Tips and tricks: Use the LG G4's feature to pin the app, this way the app will stay even when you clear all
... ( add suggestions I will add them)
issues/Bugs
-When taking a screenshot pictures come out to a more blue/red color than they appear on screen

My screen was green with JDI panel
I set my screen like my brother's Xperia Z2 because I like the colors of it. My settings are here.
Midnight
Strength 50%
Brightness 100%
Contrast 100%

kicsy023 said:
I set my screen like my brother's Xperia Z2 because I like the colors of it. My settings are here.
Midnight
Strength 50%
Brightness 100%
Contrast 100%
Click to expand...
Click to collapse
Tried it and because I have a yellow tinted screen it hasn't quite worked for me obviously. But yes indeed the xperia phones have a nice calibration on them. Funny because my reference point was my sister's Z3 on vivid mode.

Thank you for the post OP. I also bought G4 Dual sim variant few days back, and found my phone's display has reddish/pinkish tint, which is more visible on white background and in low brightness.
I have installed the app u mentioned, and it is so far working good. I still haven't found thr ebst setrings for red tint, trying out different ones, but the one i m using right now is (see screenshot below)

TheRebel said:
Thank you for the post OP. I also bought G4 Dual sim variant few days back, and found my phone's display has reddish/pinkish tint, which is more visible on white background and in low brightness.
I have installed the app u mentioned, and it is so far working good. I still haven't found thr ebst setrings for red tint, trying out different ones, but the one i m using right now is (see screenshot below)
Click to expand...
Click to collapse
My pleasure. To quickly respond to the question you asked me about the RGB values, the presets (midnight etc.) are actually values that are being composed using the RGB sliders. Using the RGB sliders will give you more control and will potentially allow you to calibrate the display to almost perfect (basically as good as the panel can be so don't expect any miracles).
However this will take a lot of time so I'll just stick with the presets for now.

Xdekker said:
My pleasure. To quickly respond to the question you asked me about the RGB values, the presets (midnight etc.) are actually values that are being composed using the RGB sliders. Using the RGB sliders will give you more control and will potentially allow you to calibrate the display to almost perfect (basically as good as the panel can be so don't expect any miracles).
However this will take a lot of time so I'll just stick with the presets for now.
Click to expand...
Click to collapse
Have u noticed some stuttering and lag with this app enabled? Or this app has nothing to do with lags etc. Like i notice some stuttering while scrolling in apps like Twitter, fb etc. And even scrolling through recent apps, it stutters/lags at times.

TheRebel said:
Have u noticed some stuttering and lag with this app enabled? Or this app has nothing to do with lags etc. Like i notice some stuttering while scrolling in apps like Twitter, fb etc. And even scrolling through recent apps, it stutters/lags at times.
Click to expand...
Click to collapse
The only issues I know of are
- When taking a screenshot the value is calculated over the original value rather than the value you actually see on-screen. This results in a blueish/yellowish/reddish picture.
- When an app wants to be granted a permission the app needs to be paused( I do not now if this is because of safety reasons imposed by google or if it's because of the dev.)

TheRebel said:
Have u noticed some stuttering and lag with this app enabled? Or this app has nothing to do with lags etc. Like i notice some stuttering while scrolling in apps like Twitter, fb etc. And even scrolling through recent apps, it stutters/lags at times.
Click to expand...
Click to collapse
Off-Topic
I think this has to do with the animation scale LG sets as default. Enable developer options and set all to ×1.0