RGB Display Calibration Using Savoca's Furnace & Franco Kernel r6

[Mnt-XDA]

!! INTRO !!

As you all know that Furnace kernel and Franco kernel version r6 has the RGB display calibration control ability ,
now we can adjust LCD screen RGB value by changing the default value (255 255 255)
in the system file "/sys/devices/platform/kcal_ctrl.0/kcal"

One can change the RGB value in the above mentioned file manually using any good file manager with root access.

But it will again reset to default (255 255 255) when you reboot phone.

Many of us (One Plus One owner) think that the LCD screen is a bit yellowish.

Feature given in CM11S --> Settings --> Display & lights --> Screen Color --> Custom will only allow us to control

Hue
Saturation
Contrast
Intensity

But it is difficult for us to adjust screen yellow tone by this.

Here is a simple tweak that can help you to set RGB (Franco Kernel r6) on boot

I have created a simple shell script that will change RGB value on every boot

!! INSTRUCTION / DOWNLOAD !!

Create a file called "Kcal_LCD_RGB_SetOnbootScript" and put into /etc/init.d/ folder and give permission "rwxr-xr-x"
*** you can give any name ***

Only Work With Furnace-1.0.1 Kernel & Franco kernel for OnePlus One that has LCD KCAL Support

#!/system/bin/sh
echo "220 230 255" > /sys/devices/platform/kcal_ctrl.0/kcal

Suggested by @savoca
--------------------------------------
"Add that line I gave you below. The control line verifies the kcal part and makes sure it's a safe or proper value before sending it to the panel."

echo "1" > /sys/devices/platform/kcal_ctrl.0/kcal_ctrl

You can set any RGB value as per your like..

Download Sample file here -- View attachment Kcal_LCD_RGB_SetOnbootScript.zip

Requirements
---------------------------------
1) OnePlus One Phone
2) CM11S Stock ROM (Franco) or CM11 Nightly with Furnace Kernel
3) Rooted Device
4) Franco Kernel r6 or Furnace Kernel
5) File Manager
---------------------------------


Another Easy way by TricksterMOD App as guided by @savoca
===============================================
Install TricksterMOD App --- https://play.google.com/store/apps/details?id=com.bigeyes0x0.trickstermod
Grant root access
Open app and click on top left menu --> Select Screen --> Adjust RGB values and hit "Right" Sing on top menu to apply it.

!! CREDIT !!

Credit goes to @savoca for Furnace-1.0.1 Kernel for OnePlus One
@franciscofranco for Franco Kernel(r6)

!! THANK YOU !!

Thanks
Give it a try and let me know you experiences in this thread.

Note: I am trying to make an app for it with color slider. it may take time since not an android/java developer.

 

[zephiK]

Lets share some RGB colors that people find well-suited to their display as well as Hue/Saturation/Contrast

 

[savoca]

what... I hope you know that franco picked this feature from my kernel to begin with...

https://github.com/franciscofranco/one_plus_one/commit/2f9a5114f239b92f0f3e5d738dcc3ce738cb9532
https://github.com/franciscofranco/one_plus_one/commit/ae04081ab025e00a38b8cbf29741b14b52558cce
https://github.com/franciscofranco/one_plus_one/commit/35da5c89c5fb5d8a4853fedb504823ab63ce8c97

 

[Mnt-XDA]

what... I hope you know that franco picked this feature from my kernel to begin with...

https://github.com/franciscofranco/one_plus_one/commit/2f9a5114f239b92f0f3e5d738dcc3ce738cb9532
https://github.com/franciscofranco/one_plus_one/commit/ae04081ab025e00a38b8cbf29741b14b52558cce
https://github.com/franciscofranco/one_plus_one/commit/35da5c89c5fb5d8a4853fedb504823ab63ce8c97

Thank you for this information...It was not known to me that it picked up from your kernel
(have not read all posts of kernel thread)

Anyway, Credit goes to both of you for giving such nice kernels..

 

[savoca]

Thank you for this information...It was not known to me
(have not read all posts of kernel thread)

Anyway Credit goes to both of you for giving such nice kernels..

Just thinking maybe you could give credit where due, if anything give it to LG. But you really plastered franco's name/kernel all over here.

Also apps like TricksterMOD already support this. And to maintain compatibility with most of the cherry-picks that will come of this, you should add this line to your script.

echo "1" > /sys/devices/platform/kcal_ctrl.0/kcal_ctrl

 

[Mnt-XDA]

Just thinking maybe you could give credit where due, if anything give it to LG. But you really plastered franco's name/kernel all over here.

Also apps like TricksterMOD already support this. And to maintain compatibility with most of the cherry-picks that will come of this, you should add this line to your script.

echo "1" > /sys/devices/platform/kcal_ctrl.0/kcal_ctrl

OP updated as suggested by you.
Thanks a lot for guiding us.

 

[shojus]

Lets share some RGB colors that people find well-suited to their display as well as Hue/Saturation/Contrast

Lets get to sharing those settings! I find Trickstermod is the best for this and can easily be configured...

 

[dj_suca]

Works like a charm... No more yellow on the bottom of the one...

 

[zephiK]

Works like a charm... No more yellow on the bottom of the one...

Share settings!

Sent from my One using Tapatalk

 

[dj_suca]

Share settings!

Sent from my One using Tapatalk

i used the default script on the first page...

 

[shojus]

Works like a charm... No more yellow on the bottom of the one...

Takes away the yellow but makes my display REALLY cold like a bluish tone. I have played quite a bit but I am yet to find any setting that makes my display look like it should from the factory... Will keep trying.

 

[dj_suca]

Takes away the yellow but makes my display REALLY cold like a bluish tone.

Not Really... but's ok..

 

[ak]

Just thinking maybe you could give credit where due, if anything give it to LG. But you really plastered franco's name/kernel all over here.

Also apps like TricksterMOD already support this. And to maintain compatibility with most of the cherry-picks that will come of this, you should add this line to your script.

echo "1" > /sys/devices/platform/kcal_ctrl.0/kcal_ctrl

Thanks man ... your ideas about kcal is fantastic ... this is a very good enhancement with the new gamma code by CM.

 

[inffy]

Takes away the yellow but makes my display REALLY cold like a bluish tone. I have played quite a bit but I am yet to find any setting that makes my display look like it should from the factory... Will keep trying.

For my taste yep. The screen get really "cold" and even blueish color with those settings.

 

[Prey521]

Takes away the yellow but makes my display REALLY cold like a bluish tone. I have played quite a bit but I am yet to find any setting that makes my display look like it should from the factory... Will keep trying.

Yep, I had to revert back to stock, looked horrible.

 

[savoca]

Thanks man ... your ideas about kcal is fantastic ... this is a very good enhancement with the new gamma code by CM.

You should see what I did with it in mako land

 

[Mbennett156]

May sound a bit stupid here but can't you already calibrate the display in display settings?

 

[Mnt-XDA]

Yep, I had to revert back to stock, looked horrible.

You can try with different RGB values, its just an example...

May sound a bit stupid here but can't you already calibrate the display in display settings?

In display setting no RGB setting is there in cm11s... you can control hue from there

 

[simo.scorpion]

Takes away the yellow but makes my display REALLY cold like a bluish tone. I have played quite a bit but I am yet to find any setting that makes my display look like it should from the factory... Will keep trying.

same for me, i dont like ist too much blue

 

[Mnt-XDA]

same for me, i dont like ist too much blue

Why don't you share optimize RGB value with us by trial and error